PropertyInfo.SetValue Method (Object, Object, array<Object[])

Parameters

• obj
  Type: System.Object
  The object whose property value will be set.

• value
  Type: System.Object
  The new value for this property.

• index
  Type: array<System.Object[]
  Optional index values for indexed properties. This value should be nulla null reference (Nothing in Visual Basic) for non-indexed properties.

Imports System.Reflection

' Define a class with a property.
Public Class TestClass
   Private myCaption As String = "A Default caption"

   Public Property Caption() As String
      Get
         Return myCaption
      End Get
      Set(ByVal value As String)
         If myCaption <> Value Then myCaption = Value
      End Set
   End Property
End Class

Public Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      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.
      outputBlock.Text += String.Format(vbCrLf & "GetValue: " & pinfo.GetValue(t, Nothing)) & vbCrLf

      ' Use the SetValue method to change the caption.
      pinfo.SetValue(t, "This caption has been changed.", Nothing)

      ' Display the caption again.
      outputBlock.Text += String.Format("GetValue: " & pinfo.GetValue(t, Nothing)) & vbCrLf

   End Sub
End Class

' This example produces the following output:
' 
'GetValue: A Default caption
'GetValue: This caption has been changed

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; }
      set
      {
         if (caption != value)
         {
            caption = value;
         }
      }
   }
}

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      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.
      outputBlock.Text += String.Format("\nGetValue: " + pinfo.GetValue(t, null)) + "\n";

      // Use the SetValue method to change the caption.
      pinfo.SetValue(t, "This caption has been changed.", null);

      //  Display the caption again.
      outputBlock.Text += String.Format("GetValue: " + pinfo.GetValue(t, null)) + "\n";
   }
}

/* This example produces the following output:

GetValue: A Default caption
GetValue: This caption has been changed
 */