Article
11/18/2011

ParameterInfo.ParameterType Property

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Gets the type of this parameter.

Namespace: System.Reflection
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Overridable ReadOnly Property ParameterType As Type

public virtual Type ParameterType { get; }

Property Value

Type: System.Type
The type of this parameter.

Remarks

This method depends on optional metadata and might not be available in all compilers.

To get the ParameterInfo array, first get the method or the constructor, and then call MethodBase.GetParameters.

Examples

The following example shows how to get ParameterInfo objects for the parameters of a method, and then use the ParameterType property to display the type of each parameter. The example defines a method with three parameters. The first parameter has no attributes, the second is an out parameter (OutAttributeByRef parameter in Visual Basic), and the third is a ref parameter (ByRef parameter in Visual Basic).

Note:
To run this example, see Building Examples That Use a Demo Method and a TextBlock Control.

Imports System.Reflection
Imports System.Runtime.InteropServices

Class Example

   Public Shared Sub mymethod(ByVal int1m As Integer, <Out> ByRef str2m As String, _
   ByRef str3m As String)
      str2m = "in mymethod"
   End Sub

   Public Shared Function Demo(ByVal outputBlock As System.Windows.Controls.TextBlock) As Integer
      outputBlock.Text &= vbLf & "Reflection.Parameterinfo" & vbCrLf

      'Get the ParameterInfo parameter of a function.
      'Get the type.
      Dim Mytype As Type = GetType(Example)

      'Get and display the method.
      Dim Mymethodbase As MethodBase = Mytype.GetMethod("mymethod")
      outputBlock.Text &= vbLf _
         & "Mymethodbase = " & Mymethodbase.ToString()

      'Get the ParameterInfo array.
      Dim Myarray As ParameterInfo() = Mymethodbase.GetParameters()

      'Get and display the ParameterInfo of each parameter.
      Dim Myparam As ParameterInfo
      For Each Myparam In Myarray
         outputBlock.Text &= vbLf _
            & "For parameter # " & Myparam.Position.ToString() _
            & ", the ParameterType is - " & Myparam.ParameterType.ToString()
      Next Myparam
      Return 0
   End Function
End Class

' This code produces the following output:
' 
' Reflection.Parameterinfo

' Mymethodbase = Void mymethod(Int32, System.String ByRef, System.String ByRef)
' For parameter # 0, the ParameterType is - System.Int32
' For parameter # 1, the ParameterType is - System.String&
' For parameter # 2, the ParameterType is - System.String&

using System;
using System.Reflection;

class Example
{
   public static void mymethod(
      int int1m, out string str2m, ref string str3m)
   {
      str2m = "in mymethod";
   }

   public static int Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      outputBlock.Text += "\nReflection.Parameterinfo" + "\n";

      //Get the ParameterInfo parameter of a function.

      //Get the type.
      Type Mytype = Type.GetType("Example");

      //Get and display the method.
      MethodBase Mymethodbase = Mytype.GetMethod("mymethod");
      outputBlock.Text += "\nMymethodbase = " + Mymethodbase;

      //Get the ParameterInfo array.
      ParameterInfo[] Myarray = Mymethodbase.GetParameters();

      //Get and display the ParameterInfo of each parameter.
      foreach (ParameterInfo Myparam in Myarray)
      {
         outputBlock.Text += "\nFor parameter # " + Myparam.Position
            + ", the ParameterType is - " + Myparam.ParameterType;
      }
      return 0;
   }
}

/*
This code produces the following output:

Reflection.Parameterinfo

Mymethodbase = Void mymethod(Int32, System.String ByRef, System.String ByRef)
For parameter # 0, the ParameterType is - System.Int32
For parameter # 1, the ParameterType is - System.String&
For parameter # 2, the ParameterType is - System.String&
*/

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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