Articolo
11/18/2011

MethodBase.GetParameters Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

When overridden in a derived class, gets the parameters of this method or constructor.

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

Syntax

'Declaration
Public MustOverride Function GetParameters As ParameterInfo()

public abstract ParameterInfo[] GetParameters()

Return Value

Type: array<System.Reflection.ParameterInfo[]
An array that contains the parameters of this method or constructor.

Exceptions

Exception	Condition
MethodAccessException	This member is invoked late-bound through mechanisms such as Type.InvokeMember.

Examples

The following example uses the GetParameters method to retrieve the parameters of the Invoke method of a delegate.

The example defines a delegate named MyDelegate and an event named ev of type MyDelegate. The code in the Main method discovers the event signature by getting the delegate type of the event, getting the Invoke method of the delegate type, and then retrieving and displaying the parameters.

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

Imports System.Reflection

Public Delegate Sub MyDelegate(ByVal i As Integer, ByRef s As String)

Public Class Example
    Public Event MyEvent As MyDelegate

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

        Dim delegateType As Type = GetType(Example).GetEvent("MyEvent").EventHandlerType

        ' The Invoke method of a delegate type always has the same signature
        ' as the delegate.
        Dim invoke As MethodInfo = delegateType.GetMethod("Invoke")

        For Each p As ParameterInfo In invoke.GetParameters()
            outputBlock.Text &= p.ParameterType.ToString() & vbLf
        Next p
    End Sub 
End Class 

' This example produces the following output:
'
'System.Int32
'System.String&

using System;
using System.Reflection;

public delegate void MyDelegate(int i, ref string s);

public class Example
{
    public event MyDelegate MyEvent;

    public static void Demo(System.Windows.Controls.TextBlock outputBlock)
    {
        Type delegateType = typeof(Example).GetEvent("MyEvent").EventHandlerType;

        // The Invoke method of a delegate type always has the same signature
        // as the delegate.
        MethodInfo invoke = delegateType.GetMethod("Invoke");

        foreach( ParameterInfo p in invoke.GetParameters() )
        {
            outputBlock.Text += p.ParameterType.ToString() + "\n";
        }
    }
}

/* This example produces the following output:

System.Int32
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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