PropertyInfo.SetValue 方法 (System.Reflection)

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public:
 void SetValue(System::Object ^ obj, System::Object ^ value);

public void SetValue (object obj, object value);

public void SetValue (object? obj, object? value);

member this.SetValue : obj * obj -> unit

Public Sub SetValue (obj As Object, value As Object)

以下示例声明一个名为的 Example 类， Shared 在 Visual Basic) 中具有一 static 个 (和一个实例属性。该示例使用 SetValue(Object, Object) 方法更改原始属性值并显示原始值和最终值。


   using namespace System;
using namespace System::Reflection;
ref class Example
private:
    int static _sharedProperty = 41;
    int _instanceProperty;
public:
    Example()
        _instanceProperty = 42;
    static property int SharedProperty
        int get() { return _sharedProperty; }
        void set(int value) { _sharedProperty = value; }
    property int InstanceProperty 
        int get() { return _instanceProperty; }
        void set(int value) { _instanceProperty = value; }
void main()
    Console::WriteLine("Initial value of static property: {0}",
                       Example::SharedProperty);
    PropertyInfo^ piShared = 
        Example::typeid->GetProperty("SharedProperty");
    piShared->SetValue(nullptr, 76, nullptr);
    Console::WriteLine("New value of static property: {0}",
                       Example::SharedProperty);
    Example^ exam = gcnew Example();
    Console::WriteLine("\nInitial value of instance property: {0}", 
            exam->InstanceProperty);
    PropertyInfo^ piInstance = 
        Example::typeid->GetProperty("InstanceProperty");
    piInstance->SetValue(exam, 37, nullptr);
    Console::WriteLine("New value of instance property: {0}",
                       exam->InstanceProperty);
/* The example displays the following output:
      Initial value of static property: 41
      New value of static property: 76
      Initial value of instance property: 42
      New value of instance property: 37
   
    using System;
using System.Reflection;
class Example
    private static int _staticProperty = 41;
    private int _instanceProperty = 42;
    // Declare a public static property.
    public static int StaticProperty
        get { return _staticProperty; }
        set { _staticProperty = value; }
    // Declare a public instance property.
    public int InstanceProperty
        get { return _instanceProperty; }
        set { _instanceProperty = value; }
    public static void Main()
        Console.WriteLine("Initial value of static property: {0}",
            Example.StaticProperty);
        // Get a type object that represents the Example type.
        Type examType = typeof(Example);
        // Change the static property value.
        PropertyInfo piShared = examType.GetProperty("StaticProperty");
        piShared.SetValue(null, 76);
        Console.WriteLine("New value of static property: {0}",
                          Example.StaticProperty);
        // Create an instance of the Example class.
        Example exam = new Example();
        Console.WriteLine("\nInitial value of instance property: {0}",
                          exam.InstanceProperty);
        // Change the instance property value.
        PropertyInfo piInstance = examType.GetProperty("InstanceProperty");
        piInstance.SetValue(exam, 37);
        Console.WriteLine("New value of instance property: {0}",
                          exam.InstanceProperty);
// The example displays the following output:
//       Initial value of static property: 41
//       New value of static property: 76
//       Initial value of instance property: 42
//       New value of instance property: 37
    
     Imports System.Reflection
Class Example
    Private Shared _sharedProperty As Integer = 41
    Private _instanceProperty As Integer = 42
    ' Declare a public static (shared) property.
    Public Shared Property SharedProperty As Integer
            Return _sharedProperty
        End Get
            _sharedProperty = Value
        End Set
    End Property
    ' Declare a public instance property.
    Public Property InstanceProperty As Integer
            Return _instanceProperty
        End Get
            _instanceProperty = Value
        End Set
    End Property
    Public Shared Sub Main()
        Console.WriteLine("Initial value of shared property: {0}",
                          Example.SharedProperty)
        ' Get a type object that represents the Example type.
        Dim examType As Type = GetType(Example)
        ' Change the static (shared) property value.
        Dim piShared As PropertyInfo = examType.GetProperty("SharedProperty")
        piShared.SetValue(Nothing, 76)
        Console.WriteLine("New value of shared property: {0}",
                          Example.SharedProperty)
        Console.WriteLine()
        ' Create an instance of the Example class.
        Dim exam As New Example
        Console.WriteLine("Initial value of instance property: {0}",
                          exam.InstanceProperty)
        ' Change the instance property value.
        Dim piInstance As PropertyInfo = examType.GetProperty("InstanceProperty")
        piInstance.SetValue(exam, 37)
        Console.WriteLine("New value of instance property: {0}", _
                          exam.InstanceProperty)
    End Sub
End Class
' The example displays the following output:
'       Initial value of shared property: 41
'       New value of shared property: 76
'       Initial value of instance property: 42
'       New value of instance property: 37
     
      重
      
       SetValue(Object, Object)
      
      载设置非索引属性的值。 若要确定是否为属性编制索引，请调用
      
       GetIndexParameters
      
      方法。 如果生成的数组具有 0 个 (零) 元素，则不会为 属性编制索引。 若要设置索引属性的值，请调用
      
       SetValue(Object, Object, Object[])
      
      重载。
     
     
      如果此
      
       PropertyInfo
      
      对象的属性类型是值类型，并且
      
       value
      
      为
      
       null
      
      ，则 属性将设置为该类型的默认值。
     
     
      这是一种方便的方法，它调用抽象
      
       SetValue(Object, Object, BindingFlags, Binder, Object[], CultureInfo)
      
      方法的运行时实现，为
      
       BindingFlags.Default
      
      
       BindingFlags
      
      参数指定 、
      
       null
      
      为
      
       null
      
      
       Object[]
      
      
       Binder
      
      和
      
       null
      
      
       CultureInfo
      
      指定 。
     
     
      若要使用
      
       SetValue
      
      方法，请首先获取表示
      
       Type
      
      类的 对象。 从 中
      
       Type
      
      获取
      
       PropertyInfo
      
      对象。
      
       PropertyInfo
      
      从 对象调用
      
       SetValue
      
      方法。
     
     
      从 .NET Framework 2.0 开始，如果调用方已使用 标志授予
      
       ReflectionPermission
      
      
       ReflectionPermissionFlag.RestrictedMemberAccess
      
      调用方，并且非公共成员的授予集仅限于调用方授权集或其子集，则此方法可用于访问非公共成员。  (请参阅 Reflection.)
      
       的安全注意事项
      
      若要使用此功能，应用程序应面向 .NET Framework 3.5 或更高版本。
     
     public:
 virtual void SetValue(System::Object ^ obj, System::Object ^ value, cli::array <System::Object ^> ^ index);
     public virtual void SetValue (object obj, object value, object[] index);
     public virtual void SetValue (object? obj, object? value, object?[]? index);
     abstract member SetValue : obj * obj * obj[] -> unit
override this.SetValue : obj * obj * obj[] -> unit
     Public Overridable Sub SetValue (obj As Object, value As Object, index As Object())
     
      以下示例定义名为
      
       TestClass
      
      的类，该类具有名为 的
      
       Caption
      
      读写属性。 它显示属性的
      
       Caption
      
      默认值，调用
      
       SetValue
      
      方法来更改属性值，并显示结果。
     
     
      using namespace System;
using namespace System::Reflection;
// Define a property.
public ref class TestClass
private:
   String^ caption;
public:
   TestClass()
      caption = "A Default caption";
   property String^ Caption 
      String^ get()
         return caption;
      void set( String^ value )
         if ( caption != value )
            caption = value;
int main()
   TestClass^ t = gcnew TestClass;
   // Get the type and PropertyInfo.
   Type^ myType = t->GetType();
   PropertyInfo^ pinfo = myType->GetProperty( "Caption" );
   // Display the property value, using the GetValue method.
   Console::WriteLine( "\nGetValue: {0}", pinfo->GetValue( t, nullptr ) );
   // Use the SetValue method to change the caption.
   pinfo->SetValue( t, "This caption has been changed.", nullptr );
   // Display the caption again.
   Console::WriteLine( "GetValue: {0}", pinfo->GetValue( t, nullptr ) );
   Console::WriteLine( "\nPress the Enter key to continue." );
   Console::ReadLine();
   return 0;
This example produces the following output:
GetValue: A Default caption
GetValue: This caption has been changed
Press the Enter key to continue.
      
       using System;
using System.Reflection;
// Define a class with a property.
public class TestClass
    private string caption = "A Default caption";
    public string Caption
        get { return caption; }
            if (caption != value)
                caption = value;
class TestPropertyInfo
    public static void Main()
        TestClass t = new TestClass();
        // Get the type and PropertyInfo.
        Type myType = t.GetType();
        PropertyInfo pinfo = myType.GetProperty("Caption");
        // Display the property value, using the GetValue method.
        Console.WriteLine("\nGetValue: " + pinfo.GetValue(t, null));
        // Use the SetValue method to change the caption.
        pinfo.SetValue(t, "This caption has been changed.", null);
        //  Display the caption again.
        Console.WriteLine("GetValue: " + pinfo.GetValue(t, null));
        Console.WriteLine("\nPress the Enter key to continue.");
        Console.ReadLine();
This example produces the following output:
GetValue: A Default caption
GetValue: This caption has been changed
Press the Enter key to continue.
       
        Imports System.Reflection
' Define a class with a property.
Public Class TestClass
    Private myCaption As String = "A Default caption"
    Public Property Caption() As String
            Return myCaption
        End Get
            If myCaption <> value Then myCaption = value
        End Set
    End Property
End Class
Public Class TestPropertyInfo
    Public Shared Sub Main()
        Dim t As New TestClass()
        ' Get the type and PropertyInfo.
        Dim myType As Type = t.GetType()
        Dim pinfo As PropertyInfo = myType.GetProperty("Caption")
        ' Display the property value, using the GetValue method.
        Console.WriteLine(vbCrLf & "GetValue: " & pinfo.GetValue(t, Nothing))
        ' Use the SetValue method to change the caption.
        pinfo.SetValue(t, "This caption has been changed.", Nothing)
        ' Display the caption again.
        Console.WriteLine("GetValue: " & pinfo.GetValue(t, Nothing))
        Console.WriteLine(vbCrLf & "Press the Enter key to continue.")
        Console.ReadLine()
    End Sub
End Class
' This example produces the following output:
'GetValue: A Default caption
'GetValue: This caption has been changed
'Press the Enter key to continue.
        
         请注意，由于
         
          Caption
         
         属性不是参数数组，因此
         
          index
         
         参数为
         
          null
         
         。
        




    

        
         以下示例声明了一个名为
         
          Example
         
         的类，该类具有三个
         
          static
         
         属性：Visual Basic)
         
          Shared
         
         中的属性 (、实例属性和索引实例属性。 该示例使用
         
          SetValue
         
         方法更改属性的默认值，并显示原始值和最终值。
        
        
         用于搜索带反射的索引实例属性的名称因语言和应用于属性的属性而异。
        
        
         
          在 Visual Basic 中，属性名称始终用于搜索具有反射的属性。 可以使用
          
           Default
          
          关键字将属性设为默认索引属性，在这种情况下，可以在访问属性时省略名称，如以下示例所示。 也可以使用属性名称。
         
        
        
         
          在 C# 中，索引实例属性是一个名为索引器的默认属性，在代码中访问属性时永远不会使用该名称。 默认情况下，属性的名称为
          
           Item
          
          ，并且必须在搜索带反射的属性时使用该名称。 可以使用
          
           IndexerNameAttribute
          
          特性为索引器提供其他名称。 在本示例中，该名称为
          
           IndexedInstanceProperty
          
          。
         
        
        
         
          在 C++ 中
          
           default
          
          ，说明符可用于将索引属性设为默认索引属性， (类索引器) 。 在这种情况下，属性的名称默认为
          
           Item
          
          ，并且必须在搜索带反射的属性时使用该名称，如此示例所示。 可以使用
          
           IndexerNameAttribute
          
          特性为类索引器提供不同的反射名称，但不能使用该名称访问代码中的 属性。 在代码和反射中使用其名称访问不是类索引器的索引属性。
         
         
          using namespace System;
using namespace System::Reflection;
using namespace System::Collections::Generic;
ref class Example
private:
    int static _sharedProperty = 41;
    int _instanceProperty;
    Dictionary<int, String^>^ _indexedInstanceProperty;
public:
    Example()
        _instanceProperty = 42;
        _indexedInstanceProperty = gcnew Dictionary<int, String^>();
    static property int SharedProperty
        int get() { return _sharedProperty; }
        void set(int value) { _sharedProperty = value; }
    property int InstanceProperty 
        int get() { return _instanceProperty; }
        void set(int value) { _instanceProperty = value; }
    // By default, the name of the default indexed property (class 
    // indexer) is Item, and that name must be used to search for the 
    // property with reflection. The property can be given a different
    // name by using the IndexerNameAttribute attribute.
    property String^ default[int]
        String^ get(int key) 
            String^ returnValue;
            if (_indexedInstanceProperty->TryGetValue(key, returnValue))
                return returnValue;
                return nullptr;
        void set(int key, String^ value)
            if (value == nullptr)
                throw gcnew ArgumentNullException( 
                    "IndexedInstanceProperty value can be an empty string, but it cannot be null.");
                if (_indexedInstanceProperty->ContainsKey(key))
                    _indexedInstanceProperty[key] = value;
                    _indexedInstanceProperty->Add(key, value);
void main()
    Console::WriteLine("Initial value of class-level property: {0}", 
        Example::SharedProperty);
    PropertyInfo^ piShared = 
        Example::typeid->GetProperty("SharedProperty");
    piShared->SetValue(nullptr, 76, nullptr);
    Console::WriteLine("Final value of class-level property: {0}", 
        Example::SharedProperty);
    Example^ exam = gcnew Example();
    Console::WriteLine("\nInitial value of instance property: {0}", 
            exam->InstanceProperty);
    PropertyInfo^ piInstance = 
        Example::typeid->GetProperty("InstanceProperty");
    piInstance->SetValue(exam, 37, nullptr);
    Console::WriteLine("Final value of instance property: {0}", 
        exam->InstanceProperty);
    exam[17] = "String number 17";
    exam[46] = "String number 46";
    exam[9] = "String number 9";
    Console::WriteLine(
        "\nInitial value of indexed instance property(17): '{0}'", 
        exam[17]);
    // By default, the name of the default indexed property (class 
    // indexer) is Item, and that name must be used to search for the 
    // property with reflection. The property can be given a different
    // name by using the IndexerNameAttribute attribute.
    PropertyInfo^ piIndexedInstance =
        Example::typeid->GetProperty("Item");
    piIndexedInstance->SetValue(
            exam, 
            "New value for string number 17", 
            gcnew array<Object^> { 17 });
    Console::WriteLine("Final value of indexed instance property(17): '{0}'", 
        exam[17]);
/* This example produces the following output:
Initial value of class-level property: 41
Final value of class-level property: 76
Initial value of instance property: 42
Final value of instance property: 37
Initial value of indexed instance property(17): 'String number 17'
Final value of indexed instance property(17): 'New value for string number 17'
          
           using System;
using System.Reflection;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
class Example
    private static int _staticProperty = 41;
    public static int StaticProperty
            return _staticProperty;
            _staticProperty = value;
    private int _instanceProperty = 42;
    public int InstanceProperty
            return _instanceProperty;
            _instanceProperty = value;
    private Dictionary<int, string> _indexedInstanceProperty =
        new Dictionary<int, string>();
    // By default, the indexer is named Item, and that name must be used
    // to search for the property. In this example, the indexer is given
    // a different name by using the IndexerNameAttribute attribute.
    [IndexerNameAttribute("IndexedInstanceProperty")]
    public string this[int key]
            string returnValue = null;
            if (_indexedInstanceProperty.TryGetValue(key, out returnValue))
                return returnValue;
                return null;
            if (value == null)
                throw new ArgumentNullException("IndexedInstanceProperty value can be an empty string, but it cannot be null.");
                if (_indexedInstanceProperty.ContainsKey(key))
                    _indexedInstanceProperty[key] = value;
                    _indexedInstanceProperty.Add(key, value);
    public static void Main()
        Console.WriteLine("Initial value of class-level property: {0}",
            Example.StaticProperty);
        PropertyInfo piShared = typeof(Example).GetProperty("StaticProperty");
        piShared.SetValue(null, 76, null);
        Console.WriteLine("Final value of class-level property: {0}",
            Example.StaticProperty);
        Example exam = new Example();
        Console.WriteLine("\nInitial value of instance property: {0}",
            exam.InstanceProperty);
        PropertyInfo piInstance =
            typeof(Example).GetProperty("InstanceProperty");
        piInstance.SetValue(exam, 37, null);
        Console.WriteLine("Final value of instance property: {0}",
            exam.InstanceProperty);
        exam[17] = "String number 17";
        exam[46] = "String number 46";
        exam[9] = "String number 9";
        Console.WriteLine(
            "\nInitial value of indexed instance property(17): '{0}'",
            exam[17]);
        // By default, the indexer is named Item, and that name must be used
        // to search for the property. In this example, the indexer is given
        // a different name by using the IndexerNameAttribute attribute.
        PropertyInfo piIndexedInstance =
            typeof(Example).GetProperty("IndexedInstanceProperty");
        piIndexedInstance.SetValue(
            exam,
            "New value for string number 17",
            new object[] { (int) 17 });
        Console.WriteLine(
            "Final value of indexed instance property(17): '{0}'",
            exam[17]);
/* This example produces the following output:
Initial value of class-level property: 41
Final value of class-level property: 76
Initial value of instance property: 42
Final value of instance property: 37
Initial value of indexed instance property(17): 'String number 17'
Final value of indexed instance property(17): 'New value for string number 17'
           
            Imports System.Reflection
Imports System.Collections.Generic
Class Example
    Private Shared _sharedProperty As Integer = 41
    Public Shared Property SharedProperty As Integer
            Return _sharedProperty
        End Get
            _sharedProperty = Value
        End Set
    End Property
    Private _instanceProperty As Integer = 42
    Public Property InstanceProperty As Integer
            Return _instanceProperty
        End Get
            _instanceProperty = Value
        End Set
    End Property
    Private _indexedInstanceProperty As New Dictionary(Of Integer, String)
    Default Public Property IndexedInstanceProperty(ByVal key As Integer) As String
            Dim returnValue As String = Nothing
            If _indexedInstanceProperty.TryGetValue(key, returnValue) Then
                Return returnValue
                Return Nothing
            End If
        End Get
            If Value Is Nothing Then
                Throw New ArgumentNullException( _
                    "IndexedInstanceProperty value can be an empty string, but it cannot be Nothing.")
                If _indexedInstanceProperty.ContainsKey(key) Then
                    _indexedInstanceProperty(key) = Value
                    _indexedInstanceProperty.Add(key, Value)
                End If
            End If
        End Set
    End Property
    Shared Sub Main()
        Console.WriteLine("Initial value of class-level property: {0}", _
            Example.SharedProperty)
        Dim piShared As PropertyInfo = _
            GetType(Example).GetProperty("SharedProperty")
        piShared.SetValue( _
            Nothing, _
            76, _
            Nothing)
        Console.WriteLine("Final value of class-level property: {0}", _
            Example.SharedProperty)
        Dim exam As New Example
        Console.WriteLine(vbCrLf & _
            "Initial value of instance property: {0}", _
            exam.InstanceProperty)
        Dim piInstance As PropertyInfo = _
            GetType(Example).GetProperty("InstanceProperty")
        piInstance.SetValue( _
            exam, _
            37, _
            Nothing)
        Console.WriteLine("Final value of instance property: {0}", _
            exam.InstanceProperty)
        exam(17) = "String number 17"
        exam(46) = "String number 46"
        ' In Visual Basic, a default indexed property can also be referred
        ' to by name.
        exam.IndexedInstanceProperty(9) = "String number 9"
        Console.WriteLine(vbCrLf & _
            "Initial value of indexed instance property(17): '{0}'", _
            exam(17))
        Dim piIndexedInstance As PropertyInfo = _
            GetType(Example).GetProperty("IndexedInstanceProperty")
        piIndexedInstance.SetValue( _
            exam, _
            "New value for string number 17", _
            New Object() { CType(17, Integer) })
        Console.WriteLine("Final value of indexed instance property(17): '{0}'", _
            exam(17))
    End Sub
End Class
' This example produces the following output:
'Initial value of class-level property: 41
'Final value of class-level property: 76
'Initial value of instance property: 42
'Final value of instance property: 37
'Initial value of indexed instance property(17): 'String number 17'
'Final value of indexed instance property(17): 'New value for string number 17'
            
             如果此
             
              PropertyInfo
             
             对象是值类型且
             
              value
             
             为
             
              null
             
             ，则 属性将设置为该类型的默认值。
            
            
             若要确定是否为属性编制索引，请使用
             
              GetIndexParameters
             
             方法。 如果生成的数组具有 0 个 (零) 元素，则不会为 属性编制索引。
            
            
             这是一种方便的方法，它调用抽象
             
              SetValue(Object, Object, BindingFlags, Binder, Object[], CultureInfo)
             
             方法的运行时实现，为
             
              BindingFlags
             
             参数指定
             
              BindingFlags.Default
             
             、
             
              null
             
             和
             
              null
             
             
              Binder
             
             
              CultureInfo
             
             。
            
            
             若要使用
             
              SetValue
             
             方法，请首先获取表示
             
              Type
             
             类的 对象。 从 中
             
              Type
             
             获取
             
              PropertyInfo
             
             。 在 中
             
              PropertyInfo
             
             ，使用
             
              SetValue
             
             方法。
            
            
             从 .NET Framework 2.0 开始，如果调用方已使用 标志授予
             
              ReflectionPermission
             
             
              ReflectionPermissionFlag.RestrictedMemberAccess
             
             调用方，并且非公共成员的授予集仅限于调用方授权集或其子集，则此方法可用于访问非公共成员。  (请参阅 Reflection.)
             
              的安全注意事项
             
             若要使用此功能，应用程序应面向 .NET Framework 3.5 或更高版本。
            
            public:
 abstract void SetValue(System::Object ^ obj, System::Object ^ value, System::Reflection::BindingFlags invokeAttr, System::Reflection::Binder ^ binder, cli::array <System::Object ^> ^ index, System::Globalization::CultureInfo ^ culture);
            public abstract void SetValue (object? obj, object? value, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder? binder, object?[]? index, System.Globalization.CultureInfo? culture);
            public abstract void SetValue (object obj, object value, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, object[] index, System.Globalization.CultureInfo culture);
            abstract member SetValue : obj * obj * System.Reflection.BindingFlags * System.Reflection.Binder * obj[] * System.Globalization.CultureInfo -> unit
            Public MustOverride Sub SetValue (obj As Object, value As Object, invokeAttr As BindingFlags, binder As Binder, index As Object(), culture As CultureInfo)
            
             要为其本地化资源的区域性。 请注意，如果没有为此区域性本地化该资源，则在搜索匹配项的过程中将继续调用
             
              Parent
             
             属性。 如果该值为
             
              null
             
             ，则从
             
              CurrentUICulture
             
             属性获取区域性的特定信息。
            
            
             SetValue(Object, Object, BindingFlags, Binder, Object[], CultureInfo)
            
            
             如果此
             
              PropertyInfo
             
             对象是值类型且
             
              value
             
             为
             
              null
             
             ，则 属性将设置为该类型的默认值。
            
            
             若要确定是否为属性编制索引，请使用
             
              GetIndexParameters
             
             方法。 如果生成的数组具有 0 个 (零) 元素，则不会为 属性编制索引。
            
            
             对于完全受信任的代码，将忽略访问限制。 也就是说，只要代码完全受信任，就可以通过反射访问和调用专用构造函数、方法、字段和属性。
            
            
             若要使用
             
              SetValue
             
             方法，请首先获取 类
             
              Type
             
             。 从 中
             
              Type
             
             获取
             
              PropertyInfo
             
             。 在 中
             
              PropertyInfo
             
             ，使用
             
              SetValue
             
             方法。
            
            
             从 .NET Framework 2.0 开始，如果调用方已使用 标志授予
             
              ReflectionPermission
             
             
              ReflectionPermissionFlag.RestrictedMemberAccess
             
             调用方，并且非公共成员的授予集仅限于调用方授权集或其子集，则此方法可用于访问非公共成员。  (请参阅 Reflection.)
             
              的安全注意事项
             
             若要使用此功能，应用程序应面向 .NET Framework 3.5 或更高版本。