Type.MakePointerType Method

Return Value

Type: System.Type
A Type object that represents a pointer to the current type.

Imports System.Reflection

Public Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      ' Create a Type object that represents a one-dimensional
      ' array of Example objects.
      Dim t As Type = GetType(Example).MakeArrayType()
      outputBlock.Text &= vbCrLf & "Array of Example: " & t.ToString() & vbCrLf

      ' Create a Type object that represents a two-dimensional
      ' array of Example objects.
      t = GetType(Example).MakeArrayType(2)
      outputBlock.Text &= vbCrLf & "Two-dimensional array of Example: " & t.ToString() & vbCrLf

      ' Demonstrate an exception when an invalid array rank is
      ' specified.
      Try
         t = GetType(Example).MakeArrayType(-1)
      Catch ex As Exception
         outputBlock.Text &= vbCrLf & ex.ToString() & vbCrLf
      End Try

      ' Create a Type object that represents a ByRef parameter
      ' of type Example.
      t = GetType(Example).MakeByRefType()
      outputBlock.Text &= vbCrLf & "ByRef Example: " & t.ToString() & vbCrLf

      ' Get a Type object representing the Example class, a
      ' MethodInfo representing the "Test" method, a ParameterInfo
      ' representing the parameter of type Example, and finally
      ' a Type object representing the type of this ByRef parameter.
      ' Compare this Type object with the Type object created using
      ' MakeByRefType.
      Dim t2 As Type = GetType(Example)
      Dim mi As MethodInfo = t2.GetMethod("Test")
      Dim pi As ParameterInfo = mi.GetParameters()(0)
      Dim pt As Type = pi.ParameterType
      outputBlock.Text &= "Are the ByRef types equal? " & (t Is pt) & vbCrLf

      ' Create a Type object that represents a pointer to an
      ' Example object.
      t = GetType(Example).MakePointerType()
      outputBlock.Text &= vbCrLf & "Pointer to Example: " & t.ToString() & vbCrLf
   End Sub

   ' A sample method with a ByRef parameter.
   '
   Public Sub Test(ByRef e As Example)
   End Sub
End Class

' This example produces output similar to the following:
'
'Array of Example: SilverlightApplication.Example[]
'
'Two-dimensional array of Example: SilverlightApplication.Example[,]
'
'System.IndexOutOfRangeException: Index was outside the bounds of the array.
'   at System.RuntimeType.MakeArrayType(Int32 rank) in c:\vbl\ndp\clr\src\BCL\System\RtType.cs:line 2999
'   at SilverlightApplication.Example.Demo(TextBlock outputBlock)
'
'ByRef Example: SilverlightApplication.Example&
'Are the ByRef types equal? True
'
'Pointer to Example: SilverlightApplication.Example*

using System;
using System.Reflection;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      // Create a Type object that represents a one-dimensional
      // array of Example objects.
      Type t = typeof(Example).MakeArrayType();
      outputBlock.Text += String.Format("\r\nArray of Example: {0}\n", t);

      // Create a Type object that represents a two-dimensional
      // array of Example objects.
      t = typeof(Example).MakeArrayType(2);
      outputBlock.Text += String.Format("\r\nTwo-dimensional array of Example: {0}\n", t);

      // Demonstrate an exception when an invalid array rank is
      // specified.
      try
      {
         t = typeof(Example).MakeArrayType(-1);
      }
      catch (Exception ex)
      {
         outputBlock.Text += String.Format("\r\n{0}\n", ex);
      }

      // Create a Type object that represents a ByRef parameter
      // of type Example.
      t = typeof(Example).MakeByRefType();
      outputBlock.Text += String.Format("\r\nByRef Example: {0}\n", t);

      // Get a Type object representing the Example class, a
      // MethodInfo representing the "Test" method, a ParameterInfo
      // representing the parameter of type Example, and finally
      // a Type object representing the type of this ByRef parameter.
      // Compare this Type object with the Type object created using
      // MakeByRefType.
      Type t2 = typeof(Example);
      MethodInfo mi = t2.GetMethod("Test");
      ParameterInfo pi = mi.GetParameters()[0];
      Type pt = pi.ParameterType;
      outputBlock.Text += String.Format("Are the ByRef types equal? {0}\n", (t == pt));

      // Create a Type object that represents a pointer to an
      // Example object.
      t = typeof(Example).MakePointerType();
      outputBlock.Text += String.Format("\r\nPointer to Example: {0}\n", t);
   }

   // A sample method with a ByRef parameter.
   //
   public void Test(ref Example e)
   {
   }
}

/* This example produces output similar to the following:

Array of Example: Example[]

Two-dimensional array of Example: Example[,]

System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.RuntimeType.MakeArrayType(Int32 rank) in c:\vbl\ndp\clr\src\BCL\System\RtType.cs:line 2999
   at Example.Demo(TextBlock outputBlock)

ByRef Example: Example&
Are the ByRef types equal? True

Pointer to Example: Example*

 */