ConfigurationValidatorAttribute 類別

定義

命名空間:

System.Configuration

組件:

System.Configuration.ConfigurationManager.dll

套件:

System.Configuration.ConfigurationManager v8.0.0

來源:

ConfigurationValidatorAttribute.cs

做為 System.Configuration 驗證程式屬性型別的基底類別。

public ref class ConfigurationValidatorAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Property)]
public class ConfigurationValidatorAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Property)>]
type ConfigurationValidatorAttribute = class
    inherit Attribute

Public Class ConfigurationValidatorAttribute
Inherits Attribute

繼承

Object

Attribute

ConfigurationValidatorAttribute

衍生

System.Configuration.CallbackValidatorAttribute

System.Configuration.IntegerValidatorAttribute

System.Configuration.LongValidatorAttribute

System.Configuration.PositiveTimeSpanValidatorAttribute

System.Configuration.RegexStringValidatorAttribute

System.Configuration.StringValidatorAttribute

System.Configuration.SubclassTypeValidatorAttribute

System.Configuration.TimeSpanValidatorAttribute

屬性

AttributeUsageAttribute

範例

下列程式代碼範例示範如何使用 型別建立兩個 ConfigurationValidatorAttribute 自定義驗證程式。 第一個範例會使用硬式編碼參數來執行驗證;第二個範例會在套用至相關區段屬性時，使用指派給它的參數來執行驗證。 此程式代碼範例也包含三個支援檔案。 第一個檔案包含使用上述驗證程式的自定義區段、第二個檔案包含自定義轉換器類型，而第三個檔案包含建置和使用自定義驗證程式和包含驗證程式的區段的控制台應用程式。

下列程式代碼範例示範如何使用硬式編碼參數建立固定驗證程式。

using System;
using System.Collections.Generic;
using System.Collections;
using System.Text;
using System.Configuration;

namespace Samples.AspNet
{
    // Show how to create a custom fixed 
    // validator. That is a validator whose
    // validation parameters are hard code in this
    // type.
    public class FixedValidator :
            ConfigurationValidatorBase
    {
       
        public override bool CanValidate(Type type)
        {
            return type == typeof(Automobile);
        }

        public override void Validate(object value)
        {

            ArrayList make = new ArrayList();

            make.Add("Ferrari");
            make.Add("Porsche");
            make.Add("Lamborghini");

            int minYear = 2004;
            long maxMiles = 100;
            string color = "red";
            
            Automobile car = (Automobile)value;

            try
            {
                if (!make.Contains(car.Make))
                {
                    throw new ConfigurationErrorsException(
                       "My dream car is not made by " + car.Make);
                }

                // Make sure the year is valid 
                if (car.Year < minYear)
                {

                    throw new ConfigurationErrorsException(
                       "My dream car cannot be older than " + minYear.ToString());
                }

                // Make sure the car can still run on its own
                if (car.Miles > maxMiles)
                {
                  throw new ConfigurationErrorsException(
                        "My dream car drive odometer cannot read more than " + 
                        maxMiles.ToString() + " miles");
                }

                // Validate color
                if (car.Color.ToLower() != color)
                {
                    throw new ConfigurationErrorsException(
                        "My dream car can oly be " + color);
                }
            }
            catch (ConfigurationErrorsException err)
            {
                Console.WriteLine(err.ToString());
            }
        }
    }
  }

Imports System.Collections.Generic
Imports System.Collections
Imports System.Text
Imports System.Configuration


' Show how to create a custom fixed 
' validator. That is a validator whose
' validation parameters are hard code in this
' type.

Public Class FixedValidator
    Inherits ConfigurationValidatorBase
    
    
    Public Overrides Function CanValidate( _
    ByVal type As Type) As Boolean
        Return type Is GetType(Automobile)

    End Function 'CanValidate
    
    
    Public Overrides Sub Validate(ByVal value _
    As Object)

        Dim make As New ArrayList()

        make.Add("Ferrari")
        make.Add("Porsche")
        make.Add("Lamborghini")

        Dim minYear As Integer = 2004
        Dim maxMiles As Long = 100
        Dim color As String = "red"

        Dim car As Automobile = CType(value, Automobile)


        Try
            If Not make.Contains(car.Make) Then
                Throw New ConfigurationErrorsException( _
                "My dream car is not made by " + car.Make)
            End If

            ' Make sure the year is valid 
            If car.Year < minYear Then
                Throw New ConfigurationErrorsException( _
                "My dream car cannot be older than " + _
                minYear.ToString())
            End If


            ' Make sure the car can still run on its own
            If car.Miles > maxMiles Then
                Throw New ConfigurationErrorsException( _
                "My dream car drive odometer cannot read more than " + _
                maxMiles.ToString() + " miles")
            End If


            ' Validate color
            If car.Color.ToLower() <> color Then
                Throw New ConfigurationErrorsException( _
                "My dream car can oly be " + color)
            End If

        Catch err As ConfigurationErrorsException
            Console.WriteLine(err.ToString())
        End Try

    End Sub
End Class

下列程式代碼範例示範如何建立可程式化驗證程式。

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;

namespace Samples.AspNet
{

    // Show how to create a custom programmable 
    // validator. That is a validator whose
    // validation parameters can be passed when the
    // validator is applied to a property.
    public class ProgrammableValidator : 
        ConfigurationValidatorBase
    {
        private string pmake;
        private string pcolor;
        private long pmaxMiles;
        private int pminYear;

        public ProgrammableValidator(string make, string color, 
            long maxMiles, int minYear)
        {
            pmake = make;
            pcolor = color;
            pminYear = minYear;
            pmaxMiles = maxMiles;
        }

        public override bool CanValidate(Type type)
        {
            return type == typeof(Automobile);
        }

        public override void Validate(object value)
        {

            Automobile car = (Automobile)value;

            try
            {

                // Validate make
                if (car.Make != pmake)
                {
                    throw new ConfigurationErrorsException(
                       "I do not by cars made by " + car.Make);
                }

                // Validate color
                if (car.Color != pcolor)
                {
                    throw new ConfigurationErrorsException(
                        "My commute car must be " + pcolor);
                }

                // Validate year
                if (car.Year < pminYear)
                {
                    throw new ConfigurationErrorsException(
                        "It's about time you get a new car.");
                }

                // Validate miles
                if (car.Miles > pmaxMiles)
                {
                    throw new ConfigurationErrorsException(
                        "Don't take too long trips with that car.");
                }
            }
            catch (ConfigurationErrorsException err)
            {
                Console.WriteLine(err.ToString());
            }
        }
    }

    public class ProgrammableValidatorAttribute : 
        ConfigurationValidatorAttribute
    {
        private string pmake;
        private string pcolor;
        private int pminYear;
        private long pmaxMiles;

        public string Make
        {
            get { return pmake; }
            set { pmake = value; }
        }

        public string Color
        {
            get { return pcolor; }
            set { pcolor = value; }
        }

        public int MinYear
        {
            get { return pminYear; }
            set { pminYear = value; }
        }
        public long MaxMiles
        {
            get { return pmaxMiles; }
            set { pmaxMiles = value; }
        }

        public ProgrammableValidatorAttribute(string make, string color,
            long miles, int year)
        {
            pmake = make;
            pcolor = color;
            pminYear = year;
            pmaxMiles = miles;
        }

        public override ConfigurationValidatorBase ValidatorInstance
        {
            get
            {
                return new ProgrammableValidator(pmake, pcolor, pmaxMiles, pminYear);
            }
        }
    }
}

Imports System.Collections.Generic
Imports System.Text
Imports System.Configuration



' Show how to create a custom programmable 
' validator. That is a validator whose
' validation parameters can be passed when the
' validator is applied to a property.

Public Class ProgrammableValidator
    Inherits ConfigurationValidatorBase
    Private pmake As String
    Private pcolor As String
    Private pmaxMiles As Long
    Private pminYear As Integer
    
    
    Public Sub New(ByVal make As String, ByVal color As String, ByVal maxMiles As Long, ByVal minYear As Integer) 
        pmake = make
        pcolor = color
        pminYear = minYear
        pmaxMiles = maxMiles
    
    End Sub
    
    
    Public Overrides Function CanValidate( _
    ByVal type As Type) As Boolean
        Return type Is GetType(Automobile)

    End Function 'CanValidate
    
    
    Public Overrides Sub Validate(ByVal value As Object) 
        
        Dim car As Automobile = CType(value, Automobile)
        
        Try
            
            ' Validate make
            If car.Make <> pmake Then
                Throw New ConfigurationErrorsException( _
                "I do not by cars made by " + car.Make)
            End If
            
            ' Validate color
            If car.Color <> pcolor Then
                Throw New ConfigurationErrorsException( _
                "My commute car must be " + pcolor)
            End If
            
            ' Validate year
            If car.Year < pminYear Then
                Throw New ConfigurationErrorsException( _
                "It's about time you get a new car.")
            End If
            
            ' Validate miles
            If car.Miles > pmaxMiles Then
                Throw New ConfigurationErrorsException( _
                "Don't take too long trips with that car.")
            End If
        
        Catch err As ConfigurationErrorsException
            Console.WriteLine(err.ToString())
        End Try
    
    End Sub
End Class



Public Class ProgrammableValidatorAttribute
    Inherits ConfigurationValidatorAttribute
    Private pmake As String
    Private pcolor As String
    Private pminYear As Integer
    Private pmaxMiles As Long
    
    
    
    Public Property Make() As String 
        Get
            Return pmake
        End Get
        Set
            pmake = value
        End Set
    End Property 
    
    Public Property Color() As String 
        Get
            Return pcolor
        End Get
        Set
            pcolor = value
        End Set
    End Property 
    
    Public Property MinYear() As Integer 
        Get
            Return pminYear
        End Get
        Set
            pminYear = value
        End Set
    End Property
    
    Public Property MaxMiles() As Long 
        Get
            Return pmaxMiles
        End Get
        Set
            pmaxMiles = value
        End Set
    End Property
     
    Public Sub New(ByVal make As String, _
    ByVal color As String, ByVal miles As Long, _
    ByVal year As Integer)
        pmake = make
        pcolor = color
        pminYear = year
        pmaxMiles = miles

    End Sub
    

    Public Overrides ReadOnly Property ValidatorInstance() _
    As ConfigurationValidatorBase
        Get
            Return New ProgrammableValidator(pmake, _
            pcolor, pmaxMiles, pminYear)
        End Get
    End Property
End Class

下列程式代碼範例示範如何使用先前的驗證程式建立自定義區段。

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.ComponentModel;
using System.Globalization;

namespace Samples.AspNet
{
    // Define the distinctive 
    // charecteristics of a car.
    public sealed class Automobile
    {
        public enum specification
        {
            make=0, color=1, miles=2, year=3, picture=4
        };

        public string Make;
        public string Color;
        public int Year;
        public long Miles;
        public string Picture;
    }

    // Define a custom section to select a car.
    // This section contains two properties one
    // to define a commute car the other 
    // to define a dream car.
    // This generates a configuration section such as:
    // <Cars commute="Make:AlfaRomeo Color:Blue Miles:10000 Year:2002"
    // dream="Make:Ferrari Color:Red Miles:10 Year:2005" />
    public sealed class SelectCar :
        ConfigurationSection
    {
        // Define your commute car.
        // The ProgrammableValidatorAttribute allows you to define the 
        // chracteristics of your commute car by changing
        // the values you pass to the next.
        // See the ProgrammableValidatorAttribute for details.
        [ProgrammableValidator("AlfaRomeo", "Blue", 10000, 2002)]
        
        // The AutomobileConverter converts between the Automobile
        // object and its related configuration commute attribute 
        // string value. 
        // Refer to AutomobileConverter for details.
        [TypeConverter(typeof(AutomobileConverter))]
        
        // Define the name of the configuration attribute to associate
        // with this property. Enter the default values.
        // Remember these default values must reflect the parameters
        // you entered in the ProgrammableValidator above.
        [ConfigurationProperty("commute", DefaultValue = "Make:AlfaRomeo Color:Blue Miles:10000 Year:2002")]
        public Automobile Commute
        {
            get
            {
                return (Automobile)this["commute"];
            }
            set
            {
                this["commute"] = value;
            }
        }

        // Apply the FixedValidatorAttribute. Here your choice 
        // (dream) is predetermined by the values contained in the
        // FixedValidatorAttribute. Being a dream, you would think 
        // otherwise but that's not the case.
        // See the FixedValidatorAttribute to choose your dream.
         [ConfigurationValidatorAttribute(
          typeof(FixedValidator))]

        // The AutomobileConverter converts between the Automobile
        // object and its related configuration dream attribute 
        // string value. 
        // Refer to AutomobileConverter for details.
        [TypeConverter(typeof(AutomobileConverter))]
        
        [ConfigurationProperty("dream", DefaultValue = "Make:Ferrari Color:Red Miles:10 Year:2005")]
        public Automobile Dream
        {
            get
            {
                return (Automobile)this["dream"];
            }
            set
            {
                this["dream"] = value;
            }
        }

        public SelectCar()
        {
            // Here you put your 
            // initializations, if necessary.
        }
    }    
}

Imports System.Collections.Generic
Imports System.Text
Imports System.Configuration
Imports System.ComponentModel
Imports System.Globalization


' Define the distinctive 
' charecteristics of a car.

NotInheritable Public Class Automobile
    
    Public Enum specification
        make = 0
        color = 1
        miles = 2
        year = 3
        picture = 4
    End Enum 'specification

    Public Make As String
    Public Color As String
    Public Year As Integer
    Public Miles As Long
    Public Picture As String
End Class

' Define a custom section to select a car.
' This section contains two properties one
' to define a commute car the other 
' to define a dream car.
' This generates a configuration section such as:
' <Cars commute="Make:AlfaRomeo Color:Blue Miles:10000 Year:2002"
' dream="Make:Ferrari Color:Red Miles:10 Year:2005" />

NotInheritable Public Class SelectCar
    Inherits ConfigurationSection
    ' Define your commute car.
    ' The ProgrammableValidatorAttribute allows you to define the 
    ' chracteristics of your commute car by changing
    ' the values you pass to the next.
    ' See the ProgrammableValidatorAttribute for details.
    
    <ProgrammableValidator("AlfaRomeo", "Blue", 10000, 2002), _
    TypeConverter(GetType(AutomobileConverter)), _
    ConfigurationProperty("commute", _
    DefaultValue:="Make:AlfaRomeo Color:Blue Miles:10000 Year:2002")> _
    Public Property Commute() As Automobile

        ' The AutomobileConverter converts between the Automobile
        ' object and its related configuration commute attribute 
        ' string value. 
        ' Refer to AutomobileConverter for details.

        ' Define the name of the configuration attribute to associate
        ' with this property. Enter the default values.
        ' Remember these default values must reflect the parameters
        ' you entered in the ProgrammableValidator above.
        Get
            Return CType(Me("commute"), Automobile)
        End Get
        Set(ByVal value As Automobile)
            Me("commute") = value
        End Set
    End Property
    
    ' Apply the FixedValidatorAttribute. Here your choice 
    ' (dream) is predetermined by the values contained in the
    ' FixedValidatorAttribute. Being a dream, you would think 
    ' otherwise but that's not the case.
    ' See the FixedValidatorAttribute to choose your dream.
    
    <ConfigurationValidatorAttribute(GetType(FixedValidator)), _
    TypeConverter(GetType(AutomobileConverter)), _
    ConfigurationProperty("dream", _
    DefaultValue:="Make:Ferrari Color:Red Miles:10 Year:2005")> _
    Public Property Dream() As Automobile

        ' The AutomobileConverter converts between the Automobile
        ' object and its related configuration dream attribute 
        ' string value. 
        ' Refer to AutomobileConverter for details.

        Get
            Return CType(Me("dream"), Automobile)
        End Get
        Set(ByVal value As Automobile)
            Me("dream") = value
        End Set
    End Property
     
    
    Public Sub New() 
    
    End Sub
End Class
' Here you put your 
' initializations, if necessary.

下列程式代碼範例示範如何建立自定義轉換器。

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.ComponentModel;
using System.Globalization;

namespace Samples.AspNet
{
    // The AutomobileConverter converts between the Automobile
    // object and its related configuration commute and
    // dream attribute string values. 
    public sealed class AutomobileConverter :
    ConfigurationConverterBase
    {
       
        internal bool ValidateType(object value,
            Type expected)
        {
            bool result;

            if ((value != null) &&
                (value.GetType() != expected))
                result = false;
            else
                result = true;

            return result;
        }

        public override bool CanConvertTo(
            ITypeDescriptorContext ctx, Type type)
        {
            return (type == typeof(Automobile));
        }

        public override bool CanConvertFrom(
            ITypeDescriptorContext ctx, Type type)
        {
            return (type == typeof(Automobile));
        }

        public override object ConvertTo(
            ITypeDescriptorContext ctx, CultureInfo ci,
            object value, Type type)
        {
            string data;

            if (ValidateType(value, typeof(Automobile)))
            {
                string make = (string)(((Automobile)value).Make);
                string color = (string)(((Automobile)value).Color);
                string miles = (string)(((Automobile)value).Miles.ToString());
                string year = (string)(((Automobile)value).Year.ToString());

                data = "Make:" + make + " Color:" + color + 
                        " Miles:" + miles + " Year:" + year;
            }
            else
            {
                data = "Invalid type";
            }

            return data;
        }

        public override object ConvertFrom(
            ITypeDescriptorContext ctx, CultureInfo ci, object data)
        {
            Automobile selectedCar = 
                new Automobile();
 
            string carInfo  = (string)data;

            string[] carSpecs = carInfo.Split(new Char[] { ' ' });

            // selectedCar.Make = carSpecs[0].ToString();
            // selectedCar.Make = carSpecs[0].ToString();

            string make = 
                carSpecs[(int)Automobile.specification.make].ToString();
            string color =
                carSpecs[(int)Automobile.specification.color].ToString();
            string miles =
                carSpecs[(int)Automobile.specification.miles].ToString();
            string year =
                carSpecs[(int)Automobile.specification.year].ToString();

            selectedCar.Make = 
                make.Substring(make.IndexOf(":")+1);
            selectedCar.Color = 
                color.Substring(color.IndexOf(":") + 1);
            selectedCar.Miles = 
                Convert.ToInt32(miles.Substring(miles.IndexOf(":") + 1));
            selectedCar.Year = 
                Convert.ToInt32(year.Substring(year.IndexOf(":") + 1));
            
            return selectedCar;
        }
    }
}

Imports System.Collections.Generic
Imports System.Text
Imports System.Configuration
Imports System.ComponentModel
Imports System.Globalization


' The AutomobileConverter converts between the Automobile
' object and its related configuration commute and
' dream attribute string values. 

NotInheritable Public Class AutomobileConverter
    Inherits ConfigurationConverterBase
    
    
    Friend Function ValidateType(ByVal value As Object, _
    ByVal expected As Type) As Boolean
        Dim result As Boolean

        If Not (value Is Nothing) _
        AndAlso value.GetType() IsNot expected Then
            result = False
        Else
            result = True
        End If
        Return result

    End Function 'ValidateType
    
    
    Public Overrides Function CanConvertTo(ByVal ctx _
    As ITypeDescriptorContext, ByVal type As Type) As Boolean
        Return type Is GetType(Automobile)

    End Function 'CanConvertTo
    
    
    
    Public Overrides Function CanConvertFrom(ByVal ctx _
    As ITypeDescriptorContext, ByVal type As Type) As Boolean
        Return type Is GetType(Automobile)

    End Function 'CanConvertFrom
    
    
    Public Overrides Function ConvertTo(ByVal ctx _
    As ITypeDescriptorContext, ByVal ci As CultureInfo, _
    ByVal value As Object, ByVal type As Type) As Object
        Dim data As String

        If ValidateType(value, GetType(Automobile)) Then
            Dim make As String = _
            CStr(CType(value, Automobile).Make)
            Dim color As String = _
            CStr(CType(value, Automobile).Color)
            Dim miles As String = _
            CStr(CType(value, Automobile).Miles.ToString())
            Dim year As String = _
            CStr(CType(value, Automobile).Year.ToString())

            data = "Make:" + make + " Color:" + color + _
            " Miles:" + miles + " Year:" + year

        Else
            data = "Invalid type"
        End If
        Return data

    End Function 'ConvertTo
    
    
    Public Overrides Function ConvertFrom(ByVal ctx _
    As ITypeDescriptorContext, ByVal ci As CultureInfo, _
    ByVal data As Object) As Object
        Dim selectedCar As New Automobile()

        Dim carInfo As String = CStr(data)

        Dim carSpecs As String() = carInfo.Split(New [Char]() {" "c})

        ' selectedCar.Make = carSpecs[0].ToString();
        ' selectedCar.Make = carSpecs[0].ToString();
        Dim make As String = _
        carSpecs(Fix(Automobile.specification.make)).ToString()
        Dim color As String = _
        carSpecs(Fix(Automobile.specification.color)).ToString()
        Dim miles As String = _
        carSpecs(Fix(Automobile.specification.miles)).ToString()
        Dim year As String = _
        carSpecs(Fix(Automobile.specification.year)).ToString()


        selectedCar.Make = _
        make.Substring(make.IndexOf(":") + 1)
        selectedCar.Color = _
        color.Substring(color.IndexOf(":") + 1)
        selectedCar.Miles = _
        Convert.ToInt32(miles.Substring(miles.IndexOf(":") + 1))
        selectedCar.Year = _
        Convert.ToInt32(year.Substring(year.IndexOf(":") + 1))

        Return selectedCar

    End Function 'ConvertFrom
End Class

下列程式代碼範例示範如何建立主控台應用程式，以建置和使用自定義驗證程式和其包含區段。

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;

namespace Samples.AspNet
{

    class TestingConfigValidatorAttribute
    {
        static TestingConfigValidatorAttribute()
        {
            try
            {

                SelectCar car;

                // Get the current configuration file.
                System.Configuration.Configuration config =
                    ConfigurationManager.OpenExeConfiguration(
                    ConfigurationUserLevel.None);

                // Create the section entry for the selected car.
                if (config.Sections["Cars"] == null)
                {
                    
                    car = new SelectCar();
                    
                    config.Sections.Add("Cars", car);
                    
                    car.SectionInformation.ForceSave = true;
                    config.Save(ConfigurationSaveMode.Full);
                }
            }
            catch (ConfigurationErrorsException err)
            {
                Console.WriteLine(err.ToString());
            }
        }

        private static void GetCars()
        {

            try
            {
                // Get the current configuration file.
                System.Configuration.Configuration config =
                    ConfigurationManager.OpenExeConfiguration(
                    ConfigurationUserLevel.None);

                // Get the Cars section.
                SelectCar cars =
                    config.GetSection("Cars") as SelectCar;

                Console.WriteLine("Dream Make: {0} Color: {1} Miles: {2} Year: {3}",
                    cars.Dream.Make, cars.Dream.Color,
                    cars.Dream.Miles, cars.Dream.Year);

                Console.WriteLine("Commute Make: {0} Color: {1} Miles: {2} Year: {3}",
                    cars.Commute.Make, cars.Commute.Color,
                    cars.Commute.Miles, cars.Commute.Year);
            }
            catch (ConfigurationErrorsException err)
            {
                Console.WriteLine(err.ToString());
            }
        }

        private static void NotAllowedCars()
        {

            try
            {
                // Get the current configuration file.
                System.Configuration.Configuration config =
                    ConfigurationManager.OpenExeConfiguration(
                    ConfigurationUserLevel.None);

                Automobile dreamCar = new Automobile();
                dreamCar.Color = "Red";
                dreamCar.Make = "BMW";
                dreamCar.Miles = 10;
                dreamCar.Year = 2005;

                Automobile commuteCar = new Automobile();
                commuteCar.Color = "Blue";
                commuteCar.Make = "Yugo";
                commuteCar.Miles = 10;
                commuteCar.Year = 1990;

                // Get the Cars section.
                SelectCar cars =
                    config.GetSection("Cars") as SelectCar;

                cars.Dream = dreamCar;
                cars.Commute = commuteCar;
            }
            catch (ConfigurationErrorsException err)
            {
                Console.WriteLine(err.ToString());
            }
        }

        static void Main(string[] args)
        {
            GetCars();
            NotAllowedCars();
        }
    }
}

Imports System.Collections.Generic
Imports System.Text
Imports System.Configuration




Class TestingConfigValidatorAttribute
    
    Shared Sub New() 
        Try
            
            Dim car As SelectCar
            
            ' Get the current configuration file.
            Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
            
            ' Create the section entry for the selected car.
            If config.Sections("Cars") Is Nothing Then
                
                car = New SelectCar()
                
                config.Sections.Add("Cars", car)
                
                car.SectionInformation.ForceSave = True
                config.Save(ConfigurationSaveMode.Full)
            End If 
        
        Catch err As ConfigurationErrorsException
            Console.WriteLine(err.ToString())
        End Try
    
    End Sub
    
    
    
    Private Shared Sub GetCars() 
        
        Try
            ' Get the current configuration file.
            Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
            
            ' Get the Cars section.
            Dim cars As SelectCar = config.GetSection("Cars")
            
            Console.WriteLine("Dream Make: {0} Color: {1} Miles: {2} Year: {3}", cars.Dream.Make, cars.Dream.Color, cars.Dream.Miles, cars.Dream.Year)
            
            Console.WriteLine("Commute Make: {0} Color: {1} Miles: {2} Year: {3}", cars.Commute.Make, cars.Commute.Color, cars.Commute.Miles, cars.Commute.Year)
        
        Catch err As ConfigurationErrorsException
            Console.WriteLine(err.ToString())
        End Try
    
    End Sub
    
    
    
    Private Shared Sub NotAllowedCars() 
        
        Try
            ' Get the current configuration file.
            Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
            
            Dim dreamCar As New Automobile()
            dreamCar.Color = "Red"
            dreamCar.Make = "BMW"
            dreamCar.Miles = 10
            dreamCar.Year = 2005
            
            Dim commuteCar As New Automobile()
            commuteCar.Color = "Blue"
            commuteCar.Make = "Yugo"
            commuteCar.Miles = 10
            commuteCar.Year = 1990
            
            ' Get the Cars section.
            Dim cars As SelectCar = config.GetSection("Cars")
              
            cars.Dream = dreamCar
            cars.Commute = commuteCar
        
        Catch err As ConfigurationErrorsException
            Console.WriteLine(err.ToString())
        End Try
    
    End Sub
    
    
    Shared Sub Main(ByVal args() As String) 
        GetCars()
        NotAllowedCars()
    
    End Sub
End Class

下列程式代碼範例是上一個範例所使用的組態摘錄。

<?xml version="1.0" encoding="utf-8"?>  
<configuration>  
    <configSections>  
        <section name="Cars" type="Samples.AspNet.SelectCar, ConfigValidatorAttribute, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" allowLocation="false" allowDefinition="Everywhere" allowExeDefinition="MachineToApplication" restartOnExternalChanges="true" requirePermission="true" />  
    </configSections>  
    <Cars commute="Make:AlfaRomeo Color:Blue Miles:10000 Year:2002"  
        dream="Make:Ferrari Color:Red Miles:10 Year:2005" />  
</configuration>  

備註

所有 ASP.NET 組態標準驗證程式屬性類型都衍生自 ConfigurationValidatorAttribute。 您可以使用此類型來建立自己的自訂驗證程式屬性。

建構函式

ConfigurationValidatorAttribute()	初始化 ConfigurationValidatorAttribute 類別的新執行個體。
ConfigurationValidatorAttribute(Type)	使用指定的驗證程式型別，初始化 ConfigurationValidatorAttribute 類別的新執行個體。

屬性

TypeId	在衍生類別中實作時，取得這個 Attribute 的唯一識別碼。 (繼承來源 Attribute)
ValidatorInstance	取得驗證程式屬性執行個體。
ValidatorType	取得驗證程式屬性的型別。

方法

Equals(Object)	傳回值，這個值指出此執行個體是否與指定的物件相等。 (繼承來源 Attribute)
GetHashCode()	傳回這個執行個體的雜湊碼。 (繼承來源 Attribute)
GetType()	取得目前執行個體的 Type。 (繼承來源 Object)
IsDefaultAttribute()	在衍生類別中覆寫時，表示這個執行個體的值是衍生類別的預設值。 (繼承來源 Attribute)
Match(Object)	在衍生類別中覆寫時，會傳回值，表示這個執行個體是否等於指定物件。 (繼承來源 Attribute)
MemberwiseClone()	建立目前 Object 的淺層複製。 (繼承來源 Object)
ToString()	傳回代表目前物件的字串。 (繼承來源 Object)

另請參閱

• IntegerValidatorAttribute
• TimeSpanValidatorAttribute
• StringValidatorAttribute