FieldInfo.SetValue Méthode

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

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

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

public void SetValue (object obj, object value);

abstract member SetValue : obj * obj -> unit
override this.SetValue : obj * obj -> unit

member this.SetValue : obj * obj -> unit

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

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

Paramètres

Implémente

Exceptions

Exemples

L’exemple suivant définit la valeur d’un champ, obtient et affiche la valeur, modifie le champ et affiche le résultat.The following example sets the value of a field, gets and displays the value, modifies the field, and displays the result.

using namespace System;
using namespace System::Reflection;
using namespace System::Globalization;

public ref class Example
{
private:
   String^ myString;

public:
   Example()
   {
      myString = "Old value";
   }

   property String^ StringProperty 
   {
      String^ get()
      {
         return myString;
      }
   }
};

int main()
{
    Example^ myObject = gcnew Example;
    Type^ myType = Example::typeid;
    FieldInfo^ myFieldInfo = myType->GetField( "myString", 
        BindingFlags::NonPublic | BindingFlags::Instance);
      
    // Display the string before applying SetValue to the field.
    Console::WriteLine( "\nThe field value of myString is \"{0}\".", 
        myFieldInfo->GetValue( myObject ) );
    // Display the SetValue signature used to set the value of a field.
    Console::WriteLine( "Applying SetValue(Object, Object)." );

    // Change the field value using the SetValue method. 
    myFieldInfo->SetValue( myObject, "New value" );     
    // Display the string after applying SetValue to the field.
    Console::WriteLine( "The field value of mystring is \"{0}\".", 
        myFieldInfo->GetValue(myObject));
}
/* This code produces the following output:

The field value of myString is "Old value".
Applying SetValue(Object, Object).
The field value of mystring is "New value".
 */

using System;
using System.Reflection;
using System.Globalization;

public class Example
{
    private string myString;
    public Example()
    {
        myString = "Old value";
    }

    public string StringProperty
    {
        get
        {
            return myString;
        }
    }
}

public class FieldInfo_SetValue
{
    public static void Main()
    {
        Example myObject = new Example();
        Type myType = typeof(Example);
        FieldInfo myFieldInfo = myType.GetField("myString",
            BindingFlags.NonPublic | BindingFlags.Instance);

        // Display the string before applying SetValue to the field.
        Console.WriteLine( "\nThe field value of myString is \"{0}\".",
        myFieldInfo.GetValue(myObject));
        // Display the SetValue signature used to set the value of a field.
        Console.WriteLine( "Applying SetValue(Object, Object).");

        // Change the field value using the SetValue method.
        myFieldInfo.SetValue(myObject, "New value");
        // Display the string after applying SetValue to the field.
        Console.WriteLine( "The field value of mystring is \"{0}\".",
            myFieldInfo.GetValue(myObject));
    }
}

/* This code example produces the following output:

The field value of myString is "Old value".
Applying SetValue(Object, Object).
The field value of mystring is "New value".
 */

Imports System.Reflection
Imports System.Globalization

Public Class Example
   Private myString As String
   
   Public Sub New()
      myString = "Old value"
   End Sub 
   
   ReadOnly Property StringProperty() As String
      Get
         Return myString
      End Get
   End Property
End Class 


Public Module FieldInfo_SetValue
   
   Sub Main()

        Dim myObject As New Example()
        Dim myType As Type = GetType(Example)
        Dim myFieldInfo As FieldInfo = myType.GetField("myString", _
           BindingFlags.NonPublic Or BindingFlags.Instance)

        ' Display the string before applying SetValue to the field.
        Console.WriteLine(vbCrLf & "The field value of myString is ""{0}"".", _
            myFieldInfo.GetValue(myObject))
        ' Display the SetValue signature used to set the value of a field.
        Console.WriteLine("Applying SetValue(Object, Object).")

        ' Change the field value using the SetValue method. 
        myFieldInfo.SetValue(myObject, "New value")
        ' Display the string after applying SetValue to the field.
        Console.WriteLine("The field value of mystring is ""{0}"".", _
            myFieldInfo.GetValue(myObject))

    End Sub 
End Module

' This code example produces the following output:
' The field value of myString is "Old value".
' Applying SetValue(Object, Object).
' The field value of mystring is "New value".

Remarques

Cette méthode est assignée value au champ réfléchi par cette instance sur l’objet obj .This method will assign value to the field reflected by this instance on object obj. Si le champ est statique, obj sera ignoré.If the field is static, obj will be ignored. Pour les champs non statiques, obj doit être une instance d’une classe qui hérite ou déclare le champ.For non-static fields, obj should be an instance of a class that inherits or declares the field. La nouvelle valeur est passée en tant que Object .The new value is passed as an Object. Par exemple, si le type du champ est booléen, une instance de Object avec la valeur booléenne appropriée est passée.For example, if the field's type is Boolean, an instance of Object with the appropriate Boolean value is passed. Avant de définir la valeur, SetValue vérifie si l’utilisateur dispose de l’autorisation d’accès.Before setting the value, SetValue checks to see if the user has access permission. Cette dernière méthode est une méthode pratique pour appeler la SetValue méthode suivante.This final method is a convenience method for calling the following SetValue method.

Cette méthode ne peut pas être utilisée pour définir des valeurs de champs statiques, init uniquement ( readonly en C#) de manière fiable.This method cannot be used to set values of static, init-only (readonly in C#) fields reliably. Dans .NET Core 3,0 et versions ultérieures, une exception est levée si vous tentez de définir une valeur sur un champ statique, en initialisation seule.In .NET Core 3.0 and later versions, an exception is thrown if you attempt to set a value on a static, init-only field.

public:
 abstract void SetValue(System::Object ^ obj, System::Object ^ value, System::Reflection::BindingFlags invokeAttr, System::Reflection::Binder ^ binder, System::Globalization::CultureInfo ^ culture);

public abstract void SetValue (object obj, object value, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Globalization.CultureInfo culture);

abstract member SetValue : obj * obj * System.Reflection.BindingFlags * System.Reflection.Binder * System.Globalization.CultureInfo -> unit

Public MustOverride Sub SetValue (obj As Object, value As Object, invokeAttr As BindingFlags, binder As Binder, culture As CultureInfo)

Paramètres

Implémente

Exceptions

Remarques

Cette méthode est assignée value au champ réfléchi par cette instance sur obj .This method will assign value to the field reflected by this instance on obj. Si le champ est statique, obj sera ignoré.If the field is static, obj will be ignored. Pour les champs non statiques, obj doit être une instance d’une classe qui hérite ou déclare le champ.For non-static fields, obj should be an instance of a class that inherits or declares the field. La nouvelle valeur est passée en tant que Object .The new value is passed as an Object. Par exemple, si le type du champ est Boolean , une instance de Object avec la valeur booléenne appropriée est passée.For example, if the field's type is Boolean, an instance of Object with the appropriate Boolean value is passed. Avant de définir la valeur, SetValue vérifie si l’utilisateur dispose de l’autorisation d’accès.Before setting the value, SetValue checks to see if the user has access permission.

Cette méthode ne peut pas être utilisée pour définir des valeurs de champs statiques, init uniquement ( readonly en C#) de manière fiable.This method cannot be used to set values of static, init-only (readonly in C#) fields reliably. Dans .NET Core 3,0 et versions ultérieures, une exception est levée si vous tentez de définir une valeur sur un champ statique, en initialisation seule.In .NET Core 3.0 and later versions, an exception is thrown if you attempt to set a value on a static, init-only field.