Artikel
11/18/2011

Type.GetEvents Method

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

Returns all the public events that are declared or inherited by the current Type.

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

Syntax

'Declaration
Public Overridable Function GetEvents As EventInfo()

public virtual EventInfo[] GetEvents()

Return Value

Type: array<System.Reflection.EventInfo[]
An array of EventInfo objects representing all the public events which are declared or inherited by the current Type.
-or-
An empty array of type EventInfo, if the current Type does not have public events.

Remarks

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.

The GetEvents method does not return events in a particular order, such as alphabetical or declaration order. Your code must not depend on the order in which events are returned, because that order varies.

This method can be overridden by a derived class.

The following table shows what members of a base class are returned by the Get methods when reflecting on a type.

Member Type	Static	Non-Static
Constructor	No	No
Field	No	Yes. A field is always hide-by-name-and-signature.
Event	Not applicable	The common type system rule is that the inheritance is the same as that of the methods that implement the property. Reflection treats properties as hide-by-name-and-signature. See note 2 below.
Method	No	Yes. A method (both virtual and non-virtual) can be hide-by-name or hide-by-name-and-signature.
Nested Type	No	No
Property	Not applicable	The common type system rule is that the inheritance is the same as that of the methods that implement the property. Reflection treats properties as hide-by-name-and-signature. See note 2 below.

Notes:

Hide-by-name-and-signature considers all of the parts of the signature, including custom modifiers, return types, parameter types, sentinels, and unmanaged calling conventions. This is a binary comparison.
For reflection, properties and events are hide-by-name-and-signature. If you have a property with both a get and a set accessor in the base class, but the derived class has only a get accessor, the derived class property hides the base class property, and you will not be able to access the setter on the base class.
Custom attributes are not part of the common type system.

If the current Type represents a constructed generic type, this method returns the EventInfo objects 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 example obtains an array of EventInfo objects, gets all the events for a class, and displays the event names.

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

Imports System.Reflection

Public Class Example

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

      For Each evi As EventInfo In outputBlock.GetType().GetEvents()

         outputBlock.Text &= evi.ToString() & vbLf

      Next evi

   End Sub

End Class

' This example produces output similar to the following:
'
'System.Windows.RoutedEventHandler Loaded
'System.Windows.SizeChangedEventHandler SizeChanged
'System.Windows.EventHandler LayoutUpdated
'System.EventHandler`1[System.Windows.Controls.ValidationErrorEventArgs] BindingValidationError
'System.Windows.Input.MouseEventHandler MouseMove
'System.Windows.Input.MouseEventHandler MouseEnter
'System.Windows.Input.MouseEventHandler MouseLeave
'System.Windows.Input.MouseButtonEventHandler MouseLeftButtonDown
'System.Windows.Input.MouseButtonEventHandler MouseLeftButtonUp
'System.Windows.Input.KeyEventHandler KeyUp
'System.Windows.Input.KeyEventHandler KeyDown
'System.Windows.Input.Mouse EventHandler
'System.Windows.RoutedEventHandler GotFocus
'System.Windows.RoutedEventHandler LostFocus
'System.Windows.Input.MouseEventHandler LostMouseCapture

using System;
using System.Reflection;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      foreach( EventInfo evi in outputBlock.GetType().GetEvents() )
      {
         outputBlock.Text += evi.ToString() + "\n";
      }
   }
}

/* This example produces output similar to the following:

System.Windows.RoutedEventHandler Loaded
System.Windows.SizeChangedEventHandler SizeChanged
System.Windows.EventHandler LayoutUpdated
System.EventHandler`1[System.Windows.Controls.ValidationErrorEventArgs] BindingValidationError
System.Windows.Input.MouseEventHandler MouseMove
System.Windows.Input.MouseEventHandler MouseEnter
System.Windows.Input.MouseEventHandler MouseLeave
System.Windows.Input.MouseButtonEventHandler MouseLeftButtonDown
System.Windows.Input.MouseButtonEventHandler MouseLeftButtonUp
System.Windows.Input.KeyEventHandler KeyUp
System.Windows.Input.KeyEventHandler KeyDown
System.Windows.Input.Mouse EventHandler
System.Windows.RoutedEventHandler GotFocus
System.Windows.RoutedEventHandler LostFocus
System.Windows.Input.MouseEventHandler LostMouseCapture
 */

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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