Article
11/17/2011

Type.GetEvent Method (String, BindingFlags)

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

When overridden in a derived class, returns the EventInfo object representing the specified event, using the specified binding constraints.

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

Syntax

'Declaration
Public MustOverride Function GetEvent ( _
    name As String, _
    bindingAttr As BindingFlags _
) As EventInfo

public abstract EventInfo GetEvent(
    string name,
    BindingFlags bindingAttr
)

Parameters

name
Type: System.String
The String containing the name of an event which is declared or inherited by the current Type.

bindingAttr
Type: System.Reflection.BindingFlags
A bitmask comprised of one or more BindingFlags that specify how the search is conducted.
-or-
Zero, to return nulla null reference (Nothing in Visual Basic).

Return Value

Type: System.Reflection.EventInfo
The EventInfo object representing the specified event which is declared or inherited by the current Type, if found; otherwise, nulla null reference (Nothing in Visual Basic).

Exceptions

Exception	Condition
ArgumentNullException	name is nulla null reference (Nothing in Visual Basic).

Remarks

The following BindingFlags filter flags can be used to define which events to include in the search:

You must specify either BindingFlags.Instance or BindingFlags.Static in order to get a return.
Specify BindingFlags.Public to include public events in the search.
Specify BindingFlags.NonPublic to include non-public events (that is, private and protected events) in the search.
Specify BindingFlags.FlattenHierarchy to include public and protected static members up the hierarchy; private static members in inherited classes are not included.

The following BindingFlags modifier flags can be used to change how the search works:

BindingFlags.IgnoreCase to ignore the case of name.
BindingFlags.DeclaredOnly to search only the events declared on the Type, not events that were simply inherited.

See System.Reflection.BindingFlags for more information.

An event is considered public to reflection if it has at least one method or accessor that is public. Otherwise the event is considered private, and you must use BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static (in Visual Basic, combine the values using Or) to get it.

If the current Type represents a constructed generic type, this method returns the EventInfo with the type parameters replaced by the appropriate type arguments.

If the current Type represents a type parameter in the definition of a generic type or generic method, this method searches the events of the class constraint.

Examples

The following code example uses the GetEvent(String, BindingFlags) method overload to search a type for a public event named "MouseLeftButtonUp" that is not static (Shared in Visual Basic).

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

Imports System.Reflection

Class Example

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

        Dim myType As Type = outputBlock.GetType()

        Dim myEvent As EventInfo = myType.GetEvent("MouseLeftButtonUp", _
            BindingFlags.Instance Or BindingFlags.Public)

        If Not (myEvent Is Nothing) Then
            outputBlock.Text &= "Looking for the MouseLeftButtonUp event in the " & _
                myType.FullName & " class." & vbCrLf
            outputBlock.Text &= myEvent.ToString() & vbCrLf
        Else
            outputBlock.Text &= "The MouseLeftButtonUp event is not found in the " & _
                myType.FullName & " class." & vbCrLf
        End If

   End Sub 
End Class 

' This example produces the following output:
'
'Looking for the MouseLeftButtonUp event in the System.Windows.Controls.TextBlock class.
'System.Windows.Input.MouseButtonEventHandler MouseLeftButtonUp

using System.Reflection;
using System;

class Example
{
    public static void Demo(System.Windows.Controls.TextBlock outputBlock)
    {
        Type myType = outputBlock.GetType();

        EventInfo myEvent = myType.GetEvent("MouseLeftButtonUp", 
            BindingFlags.Instance | BindingFlags.Public);

        if (myEvent != null)
        {
            outputBlock.Text += "Looking for the MouseLeftButtonUp event in the " +
                myType.FullName + " class.\n";
            outputBlock.Text += myEvent.ToString() + "\n";
        }
        else
        {
            outputBlock.Text += "The MouseLeftButtonUp event is not found in the " +
                myType.FullName + " class.\r\n";
        }
    }
}

/* This example produces the following output:

Looking for the MouseLeftButtonUp event in the System.Windows.Controls.TextBlock class.
System.Windows.Input.MouseButtonEventHandler MouseLeftButtonUp
 */

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.

Partager via