Type.GetField Method (String)

Parameters

• name
  Type: System.String
  The String containing the name of the data field to get.

Return Value

Type: System.Reflection.FieldInfo
A FieldInfo object representing the public field with the specified name, if found; otherwise, nulla null reference (Nothing in Visual Basic).

Imports System.Reflection

Public Class MyFieldClassA
   Public Field As String = "A Field"
End Class 

Public Class MyFieldClassB
   Private myField As String = "B Field"

   Public Property Field() As String
      Get
         Return myField
      End Get
      Set(ByVal Value As String)
         If myField <> Value Then
            myField = Value
         End If
      End Set
   End Property
End Class 


Public Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim myFieldObjectB As New MyFieldClassB()
      Dim myFieldObjectA As New MyFieldClassA()

      Dim myTypeA As Type = GetType(MyFieldClassA)
      Dim myFieldInfo As FieldInfo = myTypeA.GetField("Field")

      Dim myTypeB As Type = GetType(MyFieldClassB)
      Dim myFieldInfo1 As FieldInfo = myTypeB.GetField("myField", _
          BindingFlags.NonPublic Or BindingFlags.Instance)

      outputBlock.Text += String.Format("The value of the public field is: '{0}'", _
          myFieldInfo.GetValue(myFieldObjectA)) + vbCrLf

      Try
         ' In Silverlight, the value of a private field cannot be accessed
         ' by using reflection.
         outputBlock.Text += String.Format("The value of the private field is: '{0}'", _
            myFieldInfo1.GetValue(myFieldObjectB)) + vbCrLf
      Catch ex As Exception
         outputBlock.Text &= ex.GetType().Name & " occurred: " & ex.Message
      End Try
   End Sub 

End Class 

' This code produces output similar to the following:
'
'The value of the public field is: 'A Field'
'FieldAccessException occurred: SilverlightApplication.MyFieldClassB.myField

using System;
using System.Reflection;

public class MyFieldClassA
{
   public string Field = "A Field";
}

public class MyFieldClassB
{
   private string field = "B Field";
   public string Field
   {
      get
      {
         return field;
      }
      set
      {
         if (field != value)
         {
            field = value;
         }
      }
   }
}

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      MyFieldClassB myFieldObjectB = new MyFieldClassB();
      MyFieldClassA myFieldObjectA = new MyFieldClassA();

      Type myTypeA = typeof(MyFieldClassA);
      FieldInfo myFieldInfo = myTypeA.GetField("Field");

      Type myTypeB = typeof(MyFieldClassB);
      FieldInfo myFieldInfo1 = myTypeB.GetField("field",
          BindingFlags.NonPublic | BindingFlags.Instance);

      outputBlock.Text += String.Format("The value of the public field is: '{0}'\n",
          myFieldInfo.GetValue(myFieldObjectA));

      try
      {
         // In Silverlight, the value of a private field cannot be accessed
         // by using reflection.
         outputBlock.Text += String.Format("The value of the private field is: '{0}'\n",
            myFieldInfo1.GetValue(myFieldObjectB));
      }
      catch (Exception ex)
      {
         outputBlock.Text += ex.GetType().Name + " occurred: " + ex.Message;
      }
   }
}

/* This code produces output similar to the following:

The value of the public field is: 'A Field'
FieldAccessException occurred: MyFieldClassB.myField
 */