TimeSpan.ParseExact 方法

参考

定义

命名空间:: System

程序集:: System.Runtime.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

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将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定的格式完全匹配。

重载

ParseExact(String, String, IFormatProvider)	使用指定的格式和区域性特定的格式信息，将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定的格式完全匹配。
ParseExact(String, String[], IFormatProvider)	使用指定的格式字符串数组和区域性特定的格式信息，将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定格式之一完全匹配。
ParseExact(ReadOnlySpan<Char>, ReadOnlySpan<Char>, IFormatProvider, TimeSpanStyles)	使用指定的格式和区域性特定的格式信息，将时间间隔的字符范围转换为其等效 TimeSpan。字符串表示形式的格式必须与指定的格式完全匹配。
ParseExact(ReadOnlySpan<Char>, String[], IFormatProvider, TimeSpanStyles)	使用指定的格式、区域性特定的格式信息和样式，将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定格式之一完全匹配。
ParseExact(String, String, IFormatProvider, TimeSpanStyles)	使用指定的格式、区域性特定的格式信息和样式，将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定的格式完全匹配。
ParseExact(String, String[], IFormatProvider, TimeSpanStyles)	使用指定的格式、区域性特定的格式信息和样式，将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定格式之一完全匹配。

ParseExact(String, String, IFormatProvider)

Source:: TimeSpan.cs

Source:: TimeSpan.cs

Source:: TimeSpan.cs

使用指定的格式和区域性特定的格式信息，将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定的格式完全匹配。

public:
 static TimeSpan ParseExact(System::String ^ input, System::String ^ format, IFormatProvider ^ formatProvider);

public static TimeSpan ParseExact (string input, string format, IFormatProvider formatProvider);

public static TimeSpan ParseExact (string input, string format, IFormatProvider? formatProvider);

static member ParseExact : string * string * IFormatProvider -> TimeSpan

Public Shared Function ParseExact (input As String, format As String, formatProvider As IFormatProvider) As TimeSpan

参数

input: String

一个字符串，指定要转换的时间间隔。

format: String

定义 input所需格式的标准或自定义格式字符串。

formatProvider: IFormatProvider

提供区域性特定的格式设置信息的对象。

TimeSpan

对应于 input的时间间隔，由 format 和 formatProvider指定。

例外

ArgumentNullException

input null。

FormatException

input 格式无效。

OverflowException

input 表示小于 TimeSpan.MinValue 或大于 TimeSpan.MaxValue的数字。

-或-

input 中的至少一天、小时、分钟或秒组件超出其有效范围。

示例

以下示例使用 ParseExact(String, String, IFormatProvider) 方法使用各种格式字符串和区域性分析时间间隔的多个字符串表示形式。

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string intervalString, format;
      TimeSpan interval;
      CultureInfo culture;
      
      // Parse hour:minute value with "g" specifier current culture.
      intervalString = "17:14";
      format = "g";
      culture = CultureInfo.CurrentCulture;
      try {
         interval = TimeSpan.ParseExact(intervalString, format, culture);
         Console.WriteLine("'{0}' --> {1}", intervalString, interval);
      }
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", 
                           intervalString, format);
      }                     
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      }      
      
      // Parse hour:minute:second value with "G" specifier.
      intervalString = "17:14:48";
      format = "G";
      culture = CultureInfo.InvariantCulture;
      try {
         interval = TimeSpan.ParseExact(intervalString, format, culture);
         Console.WriteLine("'{0}' --> {1}", intervalString, interval);
      }
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
      
      // Parse hours:minute.second value with "G" specifier 
      // and current (en-US) culture.     
      intervalString = "17:14:48.153";
      format = "G";
      culture = CultureInfo.CurrentCulture;
      try {
         interval = TimeSpan.ParseExact(intervalString, format, culture);
         Console.WriteLine("'{0}' --> {1}", intervalString, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 

      // Parse days:hours:minute.second value with "G" specifier 
      // and current (en-US) culture.     
      intervalString = "3:17:14:48.153";
      format = "G";
      culture = CultureInfo.CurrentCulture;
      try {
         interval = TimeSpan.ParseExact(intervalString, format, culture);
         Console.WriteLine("'{0}' --> {1}", intervalString, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
            
      // Parse days:hours:minute.second value with "G" specifier 
      // and fr-FR culture.     
      intervalString = "3:17:14:48.153";
      format = "G";
      culture = new CultureInfo("fr-FR");
      try {
         interval = TimeSpan.ParseExact(intervalString, format, culture);
         Console.WriteLine("'{0}' --> {1}", intervalString, interval);
      }
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
      
      // Parse days:hours:minute.second value with "G" specifier 
      // and fr-FR culture.     
      intervalString = "3:17:14:48,153";
      format = "G";
      try {
         interval = TimeSpan.ParseExact(intervalString, format, culture);
         Console.WriteLine("'{0}' --> {1}", intervalString, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 

      // Parse a single number using the "c" standard format string. 
      intervalString = "12";
      format = "c";
      try {
         interval = TimeSpan.ParseExact(intervalString, format, null);
         Console.WriteLine("'{0}' --> {1}", intervalString, interval);
      }
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
      
      // Parse a single number using the "%h" custom format string. 
      format = "%h";
      try {
         interval = TimeSpan.ParseExact(intervalString, format, null);
         Console.WriteLine("'{0}' --> {1}", intervalString, interval);
      }
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
      
      // Parse a single number using the "%s" custom format string. 
      format = "%s";
      try {
         interval = TimeSpan.ParseExact(intervalString, format, null);
         Console.WriteLine("'{0}' --> {1}", intervalString, interval);
      }
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      }
   }
}
// The example displays the following output:
//       '17:14' --> 17:14:00
//       '17:14:48': Bad Format for 'G'
//       '17:14:48.153': Bad Format for 'G'
//       '3:17:14:48.153' --> 3.17:14:48.1530000
//       '3:17:14:48.153': Bad Format for 'G'
//       '3:17:14:48,153' --> 3.17:14:48.1530000
//       '12' --> 12.00:00:00
//       '12' --> 12:00:00
//       '12' --> 00:00:12

open System
open System.Globalization

do
    // Parse hour:minute value with "g" specifier current culture.
    let intervalString = "17:14"
    let format = "g"
    let culture = CultureInfo.CurrentCulture
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture)
        printfn $"'{intervalString}' --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse hour:minute:second value with "G" specifier.
    let intervalString = "17:14:48"
    let format = "G"
    let culture = CultureInfo.InvariantCulture
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture)
        printfn $"'{intervalString}' --> {interval}"
    with
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse hours:minute.second value with "G" specifier 
    // and current (en-US) culture.     
    let intervalString = "17:14:48.153"
    let format = "G"
    let culture = CultureInfo.CurrentCulture
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture)
        printfn $"'{intervalString}' --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"

    // Parse days:hours:minute.second value with "G" specifier 
    // and current (en-US) culture.     
    let intervalString = "3:17:14:48.153"
    let format = "G"
    let culture = CultureInfo.CurrentCulture
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture)
        printfn $"'{intervalString}' --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
        
    // Parse days:hours:minute.second value with "G" specifier 
    // and fr-FR culture.     
    let intervalString = "3:17:14:48.153"
    let format = "G"
    let culture = CultureInfo "fr-FR"
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture)
        printfn $"'{intervalString}' --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse days:hours:minute.second value with "G" specifier 
    // and fr-FR culture.     
    let intervalString = "3:17:14:48,153"
    let format = "G"
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture)
        printfn $"'{intervalString}' --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"

    // Parse a single number using the "c" standard format string. 
    let intervalString = "12"
    let format = "c"
    try
        let interval = TimeSpan.ParseExact(intervalString, format, null)
        printfn $"'{intervalString}' --> {interval}"
    with
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse a single number using the "%h" custom format string. 
    let format = "%h"
    try
        let interval = TimeSpan.ParseExact(intervalString, format, null)
        printfn $"'{intervalString}' --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse a single number using the "%s" custom format string. 
    let format = "%s"
    try
        let interval = TimeSpan.ParseExact(intervalString, format, null)
        printfn $"'{intervalString}' --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
// The example displays the following output:
//       '17:14' --> 17:14:00
//       '17:14:48': Bad Format for 'G'
//       '17:14:48.153': Bad Format for 'G'
//       '3:17:14:48.153' --> 3.17:14:48.1530000
//       '3:17:14:48.153': Bad Format for 'G'
//       '3:17:14:48,153' --> 3.17:14:48.1530000
//       '12' --> 12.00:00:00
//       '12' --> 12:00:00
//       '12' --> 00:00:12

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim intervalString, format As String
      Dim interval As TimeSpan
      Dim culture As CultureInfo
      
      ' Parse hour:minute value with "g" specifier current culture.
      intervalString = "17:14"
      format = "g"
      culture = CultureInfo.CurrentCulture
      Try
         interval = TimeSpan.ParseExact(intervalString, format, culture)
         Console.WriteLine("'{0}' --> {1}", intervalString, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try      
      
      ' Parse hour:minute:second value with "G" specifier.
      intervalString = "17:14:48"
      format = "G"
      culture = CultureInfo.InvariantCulture
      Try
         interval = TimeSpan.ParseExact(intervalString, format, culture)
         Console.WriteLine("'{0}' --> {1}", intervalString, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
      
      ' Parse hours:minute.second value with "G" specifier 
      ' and current (en-US) culture.     
      intervalString = "17:14:48.153"
      format = "G"
      culture = CultureInfo.CurrentCulture
      Try
         interval = TimeSpan.ParseExact(intervalString, format, culture)
         Console.WriteLine("'{0}' --> {1}", intervalString, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 

      ' Parse days:hours:minute.second value with "G" specifier 
      ' and current (en-US) culture.     
      intervalString = "3:17:14:48.153"
      format = "G"
      culture = CultureInfo.CurrentCulture
      Try
         interval = TimeSpan.ParseExact(intervalString, format, culture)
         Console.WriteLine("'{0}' --> {1}", intervalString, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
            
      ' Parse days:hours:minute.second value with "G" specifier 
      ' and fr-FR culture.     
      intervalString = "3:17:14:48.153"
      format = "G"
      culture = New CultureInfo("fr-FR")
      Try
         interval = TimeSpan.ParseExact(intervalString, format, culture)
         Console.WriteLine("'{0}' --> {1}", intervalString, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
      
      ' Parse days:hours:minute.second value with "G" specifier 
      ' and fr-FR culture.     
      intervalString = "3:17:14:48,153"
      format = "G"
      culture = New CultureInfo("fr-FR")
      Try
         interval = TimeSpan.ParseExact(intervalString, format, culture)
         Console.WriteLine("'{0}' --> {1}", intervalString, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 

      ' Parse a single number using the "c" standard format string. 
      intervalString = "12"
      format = "c"
      Try
         interval = TimeSpan.ParseExact(intervalString, format, Nothing)
         Console.WriteLine("'{0}' --> {1}", intervalString, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
      
      ' Parse a single number using the "%h" custom format string. 
      format = "%h"
      Try
         interval = TimeSpan.ParseExact(intervalString, format, Nothing)
         Console.WriteLine("'{0}' --> {1}", intervalString, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
      
      ' Parse a single number using the "%s" custom format string. 
      format = "%s"
      Try
         interval = TimeSpan.ParseExact(intervalString, format, Nothing)
         Console.WriteLine("'{0}' --> {1}", intervalString, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
   End Sub
End Module
' The example displays the following output:
'       '17:14' --> 17:14:00
'       '17:14:48': Bad Format for 'G'
'       '17:14:48.153': Bad Format for 'G'
'       '3:17:14:48.153' --> 3.17:14:48.1530000
'       '3:17:14:48.153': Bad Format for 'G'
'       '3:17:14:48,153' --> 3.17:14:48.1530000
'       '12' --> 12.00:00:00
'       '12' --> 12:00:00
'       '12' --> 00:00:12

注解

ParseExact(String, String, IFormatProvider) 方法分析时间间隔的字符串表示形式，该表示形式必须采用 format 参数定义的格式，但前导和尾随空格字符将被忽略。由于 input 必须完全符合 format 的格式，因此在将用户输入转换为时间间隔时，应始终使用异常处理。如果不想使用异常处理，可以改为调用 TryParseExact(String, String, IFormatProvider, TimeSpan) 方法。

format 参数是包含单个标准格式说明符的字符串，或者一个或多个定义所需格式 input格式的自定义格式说明符。有关有效格式字符串的详细信息，请参阅标准 TimeSpan 格式字符串和自定义 TimeSpan 格式字符串。

重要

仅当 format 是标准 TimeSpan 格式字符串（其值为“g”或“G”）时，ParseExact 方法才使用 formatProvider 参数指定的区域性约定。 “c”、“t”和“T”标准格式字符串使用固定区域性的格式约定。自定义格式字符串定义输入字符串的精确格式，并使用文本字符分隔时间间隔的组件。

formatProvider 参数是一个 IFormatProvider 实现，当 format 是标准格式字符串时，该实现提供有关返回字符串格式的区域性特定信息。 formatProvider 参数可以是以下任一参数：

一个 CultureInfo 对象，该对象表示其格式设置约定将反映在返回的字符串中的区域性。 CultureInfo.DateTimeFormat 属性返回的 DateTimeFormatInfo 对象定义返回字符串的格式。
定义返回字符串格式的 DateTimeFormatInfo 对象。
实现 IFormatProvider 接口的自定义对象。其 IFormatProvider.GetFormat 方法返回提供格式信息的 DateTimeFormatInfo 对象。

如果 formatProvidernull，则使用与当前区域性关联的 DateTimeFormatInfo 对象。

另请参阅

适用于

ParseExact(String, String[], IFormatProvider)

Source:: TimeSpan.cs

Source:: TimeSpan.cs

Source:: TimeSpan.cs

使用指定的格式字符串数组和区域性特定的格式信息，将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定格式之一完全匹配。

public:
 static TimeSpan ParseExact(System::String ^ input, cli::array <System::String ^> ^ formats, IFormatProvider ^ formatProvider);

public static TimeSpan ParseExact (string input, string[] formats, IFormatProvider formatProvider);

public static TimeSpan ParseExact (string input, string[] formats, IFormatProvider? formatProvider);

static member ParseExact : string * string[] * IFormatProvider -> TimeSpan

Public Shared Function ParseExact (input As String, formats As String(), formatProvider As IFormatProvider) As TimeSpan

参数

input: String

一个字符串，指定要转换的时间间隔。

formats: String[]

定义 input所需格式的标准或自定义格式字符串数组。

formatProvider: IFormatProvider

提供区域性特定的格式设置信息的对象。

TimeSpan

对应于 input的时间间隔，由 formats 和 formatProvider指定。

例外

ArgumentNullException

input null。

FormatException

input 格式无效。

OverflowException

input 表示小于 TimeSpan.MinValue 或大于 TimeSpan.MaxValue的数字。

-或-

input 中的至少一天、小时、分钟或秒组件超出其有效范围。

示例

以下示例调用 ParseExact(String, String[], IFormatProvider) 方法，将字符串数组的每个元素转换为 TimeSpan 值。该示例使用法语 - 法国（“fr-FR”）区域性的格式约定解释字符串。字符串可以表示采用常规短格式或常规长格式的时间间隔。

此外，该示例更改时间间隔分析方法解释单个数字的方式。通常，一个数字被解释为时间间隔中的天数。相反，%h 自定义格式字符串用于将一位数解释为小时数。要使此更改生效，请注意，%h 自定义格式字符串必须位于 formats 数组中的其他格式字符串之前。

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string[] inputs = { "3", "16:42", "1:6:52:35.0625", 
                          "1:6:52:35,0625" }; 
      string[] formats = { "g", "G", "%h"};
      TimeSpan interval;
      CultureInfo culture = new CultureInfo("fr-FR");
      
      // Parse each string in inputs using formats and the fr-FR culture.
      foreach (string input in inputs) {
         try {
            interval = TimeSpan.ParseExact(input, formats, culture);
            Console.WriteLine("{0} --> {1:c}", input, interval);
         }
         catch (FormatException) {
            Console.WriteLine("{0} --> Bad Format", input);
         }      
         catch (OverflowException) {
            Console.WriteLine("{0} --> Overflow", input);   
         }            
      }
   }
}
// The example displays the following output:
//       3 --> 03:00:00
//       16:42 --> 16:42:00
//       1:6:52:35.0625 --> Bad Format
//       1:6:52:35,0625 --> 1.06:52:35.0625000

open System
open System.Globalization

let inputs = [| "3"; "16:42"; "1:6:52:35.0625"; "1:6:52:35,0625" |] 
let formats = [| "g"; "G"; "%h" |]
let culture = CultureInfo "fr-FR"

// Parse each string in inputs using formats and the fr-FR culture.
for input in inputs do
    try
        let interval = TimeSpan.ParseExact(input, formats, culture)
        printfn $"{input} --> {interval:c}"
    with
    | :? FormatException ->
        printfn $"{input} --> Bad Format"
    | :? OverflowException ->
        printfn $"{input} --> Overflow"
// The example displays the following output:
//       3 --> 03:00:00
//       16:42 --> 16:42:00
//       1:6:52:35.0625 --> Bad Format
//       1:6:52:35,0625 --> 1.06:52:35.0625000

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim inputs() As String = { "3", "16:42", "1:6:52:35.0625", 
                                 "1:6:52:35,0625" } 
      Dim formats() As String = { "%h", "g", "G" }
      Dim interval As TimeSpan
      Dim culture As New CultureInfo("fr-FR")
      
      ' Parse each string in inputs using formats and the fr-FR culture.
      For Each input As String In inputs
         Try
            interval = TimeSpan.ParseExact(input, formats, culture)
            Console.WriteLine("{0} --> {1:c}", input, interval)   
         Catch e As FormatException
            Console.WriteLine("{0} --> Bad Format", input)   
         Catch e As OverflowException
            Console.WriteLine("{0} --> Overflow", input)   
         End Try            
      Next
   End Sub
End Module
' The example displays the following output:
'       3 --> 3.00:00:00
'       16:42 --> 16:42:00
'       1:6:52:35.0625 --> Bad Format
'       1:6:52:35,0625 --> 1.06:52:35.0625000

注解

ParseExact(String, String, IFormatProvider) 方法分析时间间隔的字符串表示形式，该表示形式必须采用 formats 参数定义的格式之一，但忽略前导和尾随空格字符。由于 input 必须完全符合 formats中指定的格式之一，因此在将用户输入的字符串转换为时间间隔时，应始终使用异常处理。如果不想使用异常处理，可以改为调用 TryParseExact(String, String[], IFormatProvider, TimeSpan) 方法。

formats 参数是一个字符串数组，其元素由单个标准格式说明符或一个或多个定义 input所需格式的自定义格式说明符组成。有关有效格式字符串的详细信息，请参阅标准 TimeSpan 格式字符串和自定义 TimeSpan 格式字符串。 input 必须与分析操作成功 formats 的成员完全对应。分析操作尝试将 input 与从数组中的第一个元素开始的 formats 中的每个元素匹配。

重要

仅当用于分析 input 的格式字符串是其值为“g”或“G”的标准 TimeSpan 格式字符串时，ParseExact 方法才使用 formatProvider 参数指定的区域性约定。 “c”、“t”和“T”标准格式字符串使用固定区域性的格式约定。自定义格式字符串定义输入字符串的精确格式，并使用文本字符分隔时间间隔的组件。

formatProvider 参数是一个 IFormatProvider 实现，如果用于分析 input 的格式字符串是标准格式字符串，则提供有关返回字符串格式的区域性特定信息。 formatProvider 参数可以是以下任一参数：

一个 CultureInfo 对象，该对象表示其格式设置约定将反映在返回的字符串中的区域性。 CultureInfo.DateTimeFormat 属性返回的 DateTimeFormatInfo 对象定义返回字符串的格式。
定义返回字符串格式的 DateTimeFormatInfo 对象。
实现 IFormatProvider 接口的自定义对象。其 IFormatProvider.GetFormat 方法返回提供格式信息的 DateTimeFormatInfo 对象。

如果 formatProvidernull，则使用与当前区域性关联的 DateTimeFormatInfo 对象。

另请参阅

适用于

ParseExact(ReadOnlySpan<Char>, ReadOnlySpan<Char>, IFormatProvider, TimeSpanStyles)

Source:: TimeSpan.cs

Source:: TimeSpan.cs

Source:: TimeSpan.cs

使用指定的格式和区域性特定的格式信息，将时间间隔的字符范围转换为其等效 TimeSpan。字符串表示形式的格式必须与指定的格式完全匹配。

public static TimeSpan ParseExact (ReadOnlySpan<char> input, ReadOnlySpan<char> format, IFormatProvider? formatProvider, System.Globalization.TimeSpanStyles styles = System.Globalization.TimeSpanStyles.None);

public static TimeSpan ParseExact (ReadOnlySpan<char> input, ReadOnlySpan<char> format, IFormatProvider formatProvider, System.Globalization.TimeSpanStyles styles = System.Globalization.TimeSpanStyles.None);

static member ParseExact : ReadOnlySpan<char> * ReadOnlySpan<char> * IFormatProvider * System.Globalization.TimeSpanStyles -> TimeSpan

Public Shared Function ParseExact (input As ReadOnlySpan(Of Char), format As ReadOnlySpan(Of Char), formatProvider As IFormatProvider, Optional styles As TimeSpanStyles = System.Globalization.TimeSpanStyles.None) As TimeSpan

参数

input: ReadOnlySpan<Char>

一个范围，指定要转换的时间间隔。

format: ReadOnlySpan<Char>

定义 input所需格式的标准或自定义格式字符串。

formatProvider: IFormatProvider

提供区域性特定的格式设置信息的对象。

styles: TimeSpanStyles

枚举值的按位组合，用于定义 input中可能存在的样式元素。

TimeSpan

对应于 input的时间间隔，由 format 和 formatProvider指定。

适用于

ParseExact(ReadOnlySpan<Char>, String[], IFormatProvider, TimeSpanStyles)

Source:: TimeSpan.cs

Source:: TimeSpan.cs

Source:: TimeSpan.cs

使用指定的格式、区域性特定的格式信息和样式，将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定格式之一完全匹配。

public static TimeSpan ParseExact (ReadOnlySpan<char> input, string[] formats, IFormatProvider? formatProvider, System.Globalization.TimeSpanStyles styles = System.Globalization.TimeSpanStyles.None);

public static TimeSpan ParseExact (ReadOnlySpan<char> input, string[] formats, IFormatProvider formatProvider, System.Globalization.TimeSpanStyles styles = System.Globalization.TimeSpanStyles.None);

static member ParseExact : ReadOnlySpan<char> * string[] * IFormatProvider * System.Globalization.TimeSpanStyles -> TimeSpan

Public Shared Function ParseExact (input As ReadOnlySpan(Of Char), formats As String(), formatProvider As IFormatProvider, Optional styles As TimeSpanStyles = System.Globalization.TimeSpanStyles.None) As TimeSpan

参数

input: ReadOnlySpan<Char>

一个范围，指定要转换的时间间隔。

formats: String[]

定义 input所需格式的标准或自定义格式字符串数组。

formatProvider: IFormatProvider

提供区域性特定的格式设置信息的对象。

styles: TimeSpanStyles

枚举值的按位组合，用于定义可能存在于输入中的样式元素。

TimeSpan

对应于由 formats、formatProvider和 styles指定的 input的时间间隔。

适用于

ParseExact(String, String, IFormatProvider, TimeSpanStyles)

Source:: TimeSpan.cs

Source:: TimeSpan.cs

Source:: TimeSpan.cs

使用指定的格式、区域性特定的格式信息和样式，将时间间隔的字符串表示形式转换为其等效 TimeSpan。字符串表示形式的格式必须与指定的格式完全匹配。

public:
 static TimeSpan ParseExact(System::String ^ input, System::String ^ format, IFormatProvider ^ formatProvider, System::Globalization::TimeSpanStyles styles);

public static TimeSpan ParseExact (string input, string format, IFormatProvider formatProvider, System.Globalization.TimeSpanStyles styles);

public static TimeSpan ParseExact (string input, string format, IFormatProvider? formatProvider, System.Globalization.TimeSpanStyles styles);

static member ParseExact : string * string * IFormatProvider * System.Globalization.TimeSpanStyles -> TimeSpan

Public Shared Function ParseExact (input As String, format As String, formatProvider As IFormatProvider, styles As TimeSpanStyles) As TimeSpan

参数

input: String

一个字符串，指定要转换的时间间隔。

format: String

定义 input所需格式的标准或自定义格式字符串。

formatProvider: IFormatProvider

提供区域性特定的格式设置信息的对象。

styles: TimeSpanStyles

枚举值的按位组合，用于定义 input中可能存在的样式元素。

TimeSpan

对应于由 format、formatProvider和 styles指定的 input的时间间隔。

例外

ArgumentException

styles 是无效的 TimeSpanStyles 值。

ArgumentNullException

input null。

FormatException

input 格式无效。

OverflowException

input 表示小于 TimeSpan.MinValue 或大于 TimeSpan.MaxValue的数字。

-或-

input 中的至少一天、小时、分钟或秒组件超出其有效范围。

示例

以下示例使用 ParseExact(String, String, IFormatProvider) 方法使用各种格式字符串和区域性分析时间间隔的多个字符串表示形式。它还使用 TimeSpanStyles.AssumeNegative 值将每个字符串解释为负时间间隔。该示例的输出说明，仅当 TimeSpanStyles.AssumeNegative 样式与自定义格式字符串一起使用时，该样式才会影响返回值。

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string intervalString, format;
      TimeSpan interval;
      CultureInfo culture = null;
      
      // Parse hour:minute value with custom format specifier.
      intervalString = "17:14";
      format = "h\\:mm";
      culture = CultureInfo.CurrentCulture;
      try {
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative);
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      }      
      
      // Parse hour:minute:second value with "g" specifier.
      intervalString = "17:14:48";
      format = "g";
      culture = CultureInfo.InvariantCulture;
      try {
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative);
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval);
      }
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
      
      // Parse hours:minute.second value with custom format specifier.     
      intervalString = "17:14:48.153";
      format = @"h\:mm\:ss\.fff";
      culture = null;
      try {
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative);
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval);
      }
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 

      // Parse days:hours:minute.second value with "G" specifier 
      // and current (en-US) culture.     
      intervalString = "3:17:14:48.153";
      format = "G";
      culture = CultureInfo.CurrentCulture;
      try {
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative);
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
            
      // Parse days:hours:minute.second value with a custom format specifier.     
      intervalString = "3:17:14:48.153";
      format = @"d\:hh\:mm\:ss\.fff";
      culture = null;
      try {
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative);
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
      
      // Parse days:hours:minute.second value with "G" specifier 
      // and fr-FR culture.     
      intervalString = "3:17:14:48,153";
      format = "G";
      culture = new CultureInfo("fr-FR");
      try {
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative);
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 

      // Parse a single number using the "c" standard format string. 
      intervalString = "12";
      format = "c";
      try {
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        null, TimeSpanStyles.AssumeNegative);
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
      
      // Parse a single number using the "%h" custom format string. 
      format = "%h";
      try {
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        null, TimeSpanStyles.AssumeNegative);
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
      
      // Parse a single number using the "%s" custom format string. 
      format = "%s";
      try {
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        null, TimeSpanStyles.AssumeNegative);
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval);
      }   
      catch (FormatException) {
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format);
      }   
      catch (OverflowException) {
         Console.WriteLine("'{0}': Overflow", intervalString);
      } 
   }
}
// The example displays the following output:
//    '17:14' (h\:mm) --> -17:14:00
//    '17:14:48' (g) --> 17:14:48
//    '17:14:48.153' (h\:mm\:ss\.fff) --> -17:14:48.1530000
//    '3:17:14:48.153' (G) --> 3.17:14:48.1530000
//    '3:17:14:48.153' (d\:hh\:mm\:ss\.fff) --> -3.17:14:48.1530000
//    '3:17:14:48,153' (G) --> 3.17:14:48.1530000
//    '12' (c) --> 12.00:00:00
//    '12' (%h) --> -12:00:00
//    '12' (%s) --> -00:00:12

open System
open System.Globalization

do
    // Parse hour:minute value with custom format specifier.
    let intervalString = "17:14"
    let format = "h\\:mm"
    let culture = CultureInfo.CurrentCulture
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture, TimeSpanStyles.AssumeNegative)
        printfn $"'{intervalString}' ({format}) --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse hour:minute:second value with "g" specifier.
    let intervalString = "17:14:48"
    let format = "g"
    let culture = CultureInfo.InvariantCulture
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture, TimeSpanStyles.AssumeNegative)
        printfn $"'{intervalString}' ({format}) --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse hours:minute.second value with custom format specifier.     
    let intervalString = "17:14:48.153"
    let format = @"h\:mm\:ss\.fff"
    let culture = null
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture, TimeSpanStyles.AssumeNegative)
        printfn $"'{intervalString}' ({format}) --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"

    // Parse days:hours:minute.second value with "G" specifier 
    // and current (en-US) culture.     
    let intervalString = "3:17:14:48.153"
    let format = "G"
    let culture = CultureInfo.CurrentCulture
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture, TimeSpanStyles.AssumeNegative)
        printfn $"'{intervalString}' ({format}) --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
        
    // Parse days:hours:minute.second value with a custom format specifier.     
    let intervalString = "3:17:14:48.153"
    let format = @"d\:hh\:mm\:ss\.fff"
    let culture = null
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture, TimeSpanStyles.AssumeNegative)
        printfn $"'{intervalString}' ({format}) --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse days:hours:minute.second value with "G" specifier 
    // and fr-FR culture.     
    let intervalString = "3:17:14:48,153"
    let format = "G"
    let culture = new CultureInfo("fr-FR")
    try
        let interval = TimeSpan.ParseExact(intervalString, format, culture, TimeSpanStyles.AssumeNegative)
        printfn $"'{intervalString}' ({format}) --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"

    // Parse a single number using the "c" standard format string. 
    let intervalString = "12"
    let format = "c"
    try
        let interval = TimeSpan.ParseExact(intervalString, format, null, TimeSpanStyles.AssumeNegative)
        printfn $"'{intervalString}' ({format}) --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse a single number using the "%h" custom format string. 
    let format = "%h"
    try
        let interval = TimeSpan.ParseExact(intervalString, format, null, TimeSpanStyles.AssumeNegative)
        printfn $"'{intervalString}' ({format}) --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
    
    // Parse a single number using the "%s" custom format string. 
    let format = "%s"
    try
        let interval = TimeSpan.ParseExact(intervalString, format, null, TimeSpanStyles.AssumeNegative)
        printfn $"'{intervalString}' ({format}) --> {interval}"
    with 
    | :? FormatException ->
        printfn $"'{intervalString}': Bad Format for '{format}'"
    | :? OverflowException ->
        printfn $"'{intervalString}': Overflow"
// The example displays the following output:
//    '17:14' (h\:mm) --> -17:14:00
//    '17:14:48' (g) --> 17:14:48
//    '17:14:48.153' (h\:mm\:ss\.fff) --> -17:14:48.1530000
//    '3:17:14:48.153' (G) --> 3.17:14:48.1530000
//    '3:17:14:48.153' (d\:hh\:mm\:ss\.fff) --> -3.17:14:48.1530000
//    '3:17:14:48,153' (G) --> 3.17:14:48.1530000
//    '12' (c) --> 12.00:00:00
//    '12' (%h) --> -12:00:00
//    '12' (%s) --> -00:00:12

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim intervalString, format As String
      Dim interval As TimeSpan
      Dim culture As CultureInfo = Nothing
      
      ' Parse hour:minute value with custom format specifier.
      intervalString = "17:14"
      format = "h\:mm"
      culture = CultureInfo.CurrentCulture
      Try
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative)
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try      
      
      ' Parse hour:minute:second value with "g" specifier.
      intervalString = "17:14:48"
      format = "g"
      culture = CultureInfo.InvariantCulture
      Try
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative)
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
      
      ' Parse hours:minute.second value with custom format specifier.     
      intervalString = "17:14:48.153"
      format = "h\:mm\:ss\.fff"
      culture = Nothing
      Try
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative)
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 

      ' Parse days:hours:minute.second value with "G" specifier 
      ' and current (en-US) culture.     
      intervalString = "3:17:14:48.153"
      format = "G"
      culture = CultureInfo.CurrentCulture
      Try
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative)
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
            
      ' Parse days:hours:minute.second value with a custom format specifier.     
      intervalString = "3:17:14:48.153"
      format = "d\:hh\:mm\:ss\.fff"
      culture = Nothing
      Try
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative)
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
      
      ' Parse days:hours:minute.second value with "G" specifier 
      ' and fr-FR culture.     
      intervalString = "3:17:14:48,153"
      format = "G"
      culture = New CultureInfo("fr-FR")
      Try
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        culture, TimeSpanStyles.AssumeNegative)
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 

      ' Parse a single number using the "c" standard format string. 
      intervalString = "12"
      format = "c"
      Try
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        Nothing, TimeSpanStyles.AssumeNegative)
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
      
      ' Parse a single number using the "%h" custom format string. 
      format = "%h"
      Try
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        Nothing, TimeSpanStyles.AssumeNegative)
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
      
      ' Parse a single number using the "%s" custom format string. 
      format = "%s"
      Try
         interval = TimeSpan.ParseExact(intervalString, format, 
                                        Nothing, TimeSpanStyles.AssumeNegative)
         Console.WriteLine("'{0}' ({1}) --> {2}", intervalString, format, interval)
      Catch e As FormatException
         Console.WriteLine("'{0}': Bad Format for '{1}'", intervalString, format)
      Catch e As OverflowException
         Console.WriteLine("'{0}': Overflow", intervalString)
      End Try 
   End Sub
End Module
' The example displays the following output:
'    '17:14' (h\:mm) --> -17:14:00
'    '17:14:48' (g) --> 17:14:48
'    '17:14:48.153' (h\:mm\:ss\.fff) --> -17:14:48.1530000
'    '3:17:14:48.153' (G) --> 3.17:14:48.1530000
'    '3:17:14:48.153' (d\:hh\:mm\:ss\.fff) --> -3.17:14:48.1530000
'    '3:17:14:48,153' (G) --> 3.17:14:48.1530000
'    '12' (c) --> 12.00:00:00
'    '12' (%h) --> -12:00:00
'    '12' (%s) --> -00:00:12

注解

ParseExact 方法分析时间间隔的字符串表示形式，该表示形式必须采用 format 参数定义的格式，但前导和尾随空格字符将被忽略。由于 input 必须完全符合 format 的格式，因此在将用户输入转换为时间间隔时，应始终使用异常处理。如果不想使用异常处理，可以改为调用 TryParseExact(String, String, IFormatProvider, TimeSpanStyles, TimeSpan) 方法。

重要

一个 CultureInfo 对象，该对象表示其格式设置约定将反映在返回的字符串中的区域性。 CultureInfo.DateTimeFormat 属性返回的 DateTimeFormatInfo 对象定义返回字符串的格式。
定义返回字符串格式的 DateTimeFormatInfo 对象。
实现 IFormatProvider 接口的自定义对象。其 IFormatProvider.GetFormat 方法返回提供格式信息的 DateTimeFormatInfo 对象。

如果 formatProvidernull，则使用与当前区域性关联的 DateTimeFormatInfo 对象。

styles 参数会影响使用自定义格式字符串分析的字符串的解释。它确定仅当存在负号（TimeSpanStyles.None），还是始终解释为负时间间隔（TimeSpanStyles.AssumeNegative）时，input 是否被解释为负时间间隔。如果未使用 TimeSpanStyles.AssumeNegative，format 必须包含文本负号符号（如“\-”）才能成功分析负时间间隔。

另请参阅

适用于

ParseExact(String, String[], IFormatProvider, TimeSpanStyles)

Source:: TimeSpan.cs

Source:: TimeSpan.cs

Source:: TimeSpan.cs

public:
 static TimeSpan ParseExact(System::String ^ input, cli::array <System::String ^> ^ formats, IFormatProvider ^ formatProvider, System::Globalization::TimeSpanStyles styles);

public static TimeSpan ParseExact (string input, string[] formats, IFormatProvider formatProvider, System.Globalization.TimeSpanStyles styles);

public static TimeSpan ParseExact (string input, string[] formats, IFormatProvider? formatProvider, System.Globalization.TimeSpanStyles styles);

static member ParseExact : string * string[] * IFormatProvider * System.Globalization.TimeSpanStyles -> TimeSpan

Public Shared Function ParseExact (input As String, formats As String(), formatProvider As IFormatProvider, styles As TimeSpanStyles) As TimeSpan

参数

input: String

一个字符串，指定要转换的时间间隔。

formats: String[]

定义 input所需格式的标准或自定义格式字符串数组。

formatProvider: IFormatProvider

提供区域性特定的格式设置信息的对象。

styles: TimeSpanStyles

枚举值的按位组合，用于定义可能存在于输入中的样式元素。

TimeSpan

对应于由 formats、formatProvider和 styles指定的 input的时间间隔。

例外

ArgumentException

styles 是无效的 TimeSpanStyles 值。

ArgumentNullException

input null。

FormatException

input 格式无效。

OverflowException

input 表示小于 TimeSpan.MinValue 或大于 TimeSpan.MaxValue的数字。

-或-

input 中的至少一天、小时、分钟或秒组件超出其有效范围。

示例

以下示例调用 ParseExact(String, String[], IFormatProvider, TimeSpanStyles) 方法，将字符串数组的每个元素转换为 TimeSpan 值。字符串可以表示采用常规短格式或常规长格式的时间间隔。

此外，该示例更改时间间隔分析方法解释单个数字的方式。通常，一个数字被解释为时间间隔中的天数。相反，%h 自定义格式字符串用于将一位数解释为小时数。要使此更改生效，请注意，%h 自定义格式字符串必须位于 formats 数组中的其他格式字符串之前。另请注意，输出中仅当分析具有此格式说明符的字符串时，才使用方法调用中指定的 TimeSpanStyles.AssumeNegative 标志。

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string[] inputs = { "3", "16:42", "1:6:52:35.0625", 
                          "1:6:52:35,0625" }; 
      string[] formats = { "%h", "g", "G" };
      TimeSpan interval;
      CultureInfo culture = new CultureInfo("de-DE");
      
      // Parse each string in inputs using formats and the de-DE culture.
      foreach (string input in inputs) {
         try {
            interval = TimeSpan.ParseExact(input, formats, culture,
                                           TimeSpanStyles.AssumeNegative);
            Console.WriteLine("{0} --> {1:c}", input, interval);
         }
         catch (FormatException) {
            Console.WriteLine("{0} --> Bad Format", input);
         }      
         catch (OverflowException) {
            Console.WriteLine("{0} --> Overflow", input);   
         }            
      }
   }
}
// The example displays the following output:
//       3 --> -03:00:00
//       16:42 --> 16:42:00
//       1:6:52:35.0625 --> Bad Format
//       1:6:52:35,0625 --> 1.06:52:35.0625000

open System
open System.Globalization

let inputs = 
    [| "3"; "16:42"; "1:6:52:35.0625"; "1:6:52:35,0625" |] 
let formats = [| "%h"; "g"; "G" |]
let culture = CultureInfo "de-DE"

// Parse each string in inputs using formats and the de-DE culture.
for input in inputs do
    try
        let interval = 
            TimeSpan.ParseExact(input, formats, culture, TimeSpanStyles.AssumeNegative)
        printfn $"{input} --> {interval:c}"
    with
    | :? FormatException ->
        printfn $"{input} --> Bad Format"
    | :? OverflowException ->
        printfn $"{input} --> Overflow"
// The example displays the following output:
//       3 --> -03:00:00
//       16:42 --> 16:42:00
//       1:6:52:35.0625 --> Bad Format
//       1:6:52:35,0625 --> 1.06:52:35.0625000

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim inputs() As String = { "3", "16:42", "1:6:52:35.0625", 
                                 "1:6:52:35,0625" } 
      Dim formats() As String = { "%h", "g", "G" }
      Dim interval As TimeSpan
      Dim culture As New CultureInfo("de-DE")
      
      ' Parse each string in inputs using formats and the de-DE culture.
      For Each input As String In inputs
         Try
            interval = TimeSpan.ParseExact(input, formats, culture, 
                                           TimeSpanStyles.AssumeNegative)
            Console.WriteLine("{0} --> {1:c}", input, interval)   
         Catch e As FormatException
            Console.WriteLine("{0} --> Bad Format", input)   
         Catch e As OverflowException
            Console.WriteLine("{0} --> Overflow", input)   
         End Try            
      Next
   End Sub
End Module
' The example displays the following output:
'       3 --> -03:00:00
'       16:42 --> 16:42:00
'       1:6:52:35.0625 --> Bad Format
'       1:6:52:35,0625 --> 1.06:52:35.0625000

注解

ParseExact(String, String[], IFormatProvider, TimeSpanStyles) 方法分析时间间隔的字符串表示形式，该表示形式必须采用 formats 参数定义的格式之一，但忽略前导和尾随空格字符。由于 input 必须完全符合 formats中指定的格式之一，因此在将用户输入的字符串转换为时间间隔时，应始终使用异常处理。如果不想使用异常处理，可以改为调用 TryParseExact(String, String[], IFormatProvider, TimeSpanStyles, TimeSpan) 方法。

重要

一个 CultureInfo 对象，该对象表示其格式设置约定将反映在返回的字符串中的区域性。 CultureInfo.DateTimeFormat 属性返回的 DateTimeFormatInfo 对象定义返回字符串的格式。
定义返回字符串格式的 DateTimeFormatInfo 对象。
实现 IFormatProvider 接口的自定义对象。其 IFormatProvider.GetFormat 方法返回提供格式信息的 DateTimeFormatInfo 对象。

如果 formatProvidernull，则使用与当前区域性关联的 DateTimeFormatInfo 对象。

另请参阅

适用于

通过

TimeSpan.ParseExact 方法

定义

重载

ParseExact(String, String, IFormatProvider)

参数

返回

例外

示例

注解

另请参阅

适用于

ParseExact(String, String[], IFormatProvider)

参数

返回

例外

示例

注解

另请参阅

适用于

ParseExact(ReadOnlySpan<Char>, ReadOnlySpan<Char>, IFormatProvider, TimeSpanStyles)

参数

返回

适用于

ParseExact(ReadOnlySpan<Char>, String[], IFormatProvider, TimeSpanStyles)

参数

返回

适用于

ParseExact(String, String, IFormatProvider, TimeSpanStyles)

参数

返回

例外

示例

注解

另请参阅

适用于

ParseExact(String, String[], IFormatProvider, TimeSpanStyles)

参数

返回

例外

示例

注解

另请参阅

适用于

其他资源