MemoryExtensions.StartsWith 方法

定义

命名空间:

System

程序集:

System.Memory.dll

重载

StartsWith(ReadOnlySpan<Char>, ReadOnlySpan<Char>, StringComparison)	使用指定的 StringComparison 值进行比较时，确定只读字符范围是否以指定值开头。
StartsWith<T>(Span<T>, ReadOnlySpan<T>)	确定指定的序列是否出现在范围开头。
StartsWith<T>(ReadOnlySpan<T>, ReadOnlySpan<T>)	确定指定的序列是否出现在只读范围开始时。

StartsWith(ReadOnlySpan<Char>, ReadOnlySpan<Char>, StringComparison)

Source:

MemoryExtensions.Globalization.cs

使用指定的 StringComparison 值进行比较时，确定只读字符范围是否以指定值开头。

public:
[System::Runtime::CompilerServices::Extension]
 static bool StartsWith(ReadOnlySpan<char> span, ReadOnlySpan<char> value, StringComparison comparisonType);

public static bool StartsWith (this ReadOnlySpan<char> span, ReadOnlySpan<char> value, StringComparison comparisonType);

static member StartsWith : ReadOnlySpan<char> * ReadOnlySpan<char> * StringComparison -> bool

<Extension()>
Public Function StartsWith (span As ReadOnlySpan(Of Char), value As ReadOnlySpan(Of Char), comparisonType As StringComparison) As Boolean

参数

span

ReadOnlySpan<Char>

源范围。

value

ReadOnlySpan<Char>

要与源范围的开头进行比较的序列。

comparisonType

StringComparison

一个枚举值，该值确定如何比较 span 和 value。

返回

Boolean

如果 value 与 span的开头匹配，则 true;否则，false。

StartsWith<T>(Span<T>, ReadOnlySpan<T>)

Source:

MemoryExtensions.cs

确定指定的序列是否出现在范围开头。

public:
generic <typename T>
 where T : IEquatable<T>[System::Runtime::CompilerServices::Extension]
 static bool StartsWith(Span<T> span, ReadOnlySpan<T> value);

public static bool StartsWith<T> (this Span<T> span, ReadOnlySpan<T> value) where T : IEquatable<T>;

static member StartsWith : Span<'T (requires 'T :> IEquatable<'T>)> * ReadOnlySpan<'T (requires 'T :> IEquatable<'T>)> -> bool (requires 'T :> IEquatable<'T>)

<Extension()>
Public Function StartsWith(Of T As IEquatable(Of T)) (span As Span(Of T), value As ReadOnlySpan(Of T)) As Boolean

类型参数

T

范围中元素的类型。

参数

span

Span<T>

要搜索的跨度。

value

ReadOnlySpan<T>

要在 span开始时搜索的序列。

返回

Boolean

如果 value 与 span的开头匹配，则 true;否则，false。

StartsWith<T>(ReadOnlySpan<T>, ReadOnlySpan<T>)

Source:

MemoryExtensions.cs

确定指定的序列是否出现在只读范围开始时。

public:
generic <typename T>
 where T : IEquatable<T>[System::Runtime::CompilerServices::Extension]
 static bool StartsWith(ReadOnlySpan<T> span, ReadOnlySpan<T> value);

public static bool StartsWith<T> (this ReadOnlySpan<T> span, ReadOnlySpan<T> value) where T : IEquatable<T>;

static member StartsWith : ReadOnlySpan<'T (requires 'T :> IEquatable<'T>)> * ReadOnlySpan<'T (requires 'T :> IEquatable<'T>)> -> bool (requires 'T :> IEquatable<'T>)

<Extension()>
Public Function StartsWith(Of T As IEquatable(Of T)) (span As ReadOnlySpan(Of T), value As ReadOnlySpan(Of T)) As Boolean

类型参数

T

范围中的元素类型。

参数

span

ReadOnlySpan<T>

要搜索的只读字符范围。

value

ReadOnlySpan<T>

要在 span开始时搜索的序列。

返回

Boolean

如果 value 与 span的开头匹配，则 true;否则，false。