AutomationEvent.EventRaised Event


Occurs when the Automation event occurs.

Namespace:  System.Runtime.InteropServices.Automation
Assembly:  System.Windows (in System.Windows.dll)

public event EventHandler<AutomationEventArgs> EventRaised

This event is useful for attaching managed event handlers to Automation events without requiring knowledge of the Automation event signatures. It also enables you to use Automation events with the standard Visual Basic event handling syntax. You can use this event with the AddHandler and RemoveHandler statements. You can also use the Handles keyword after storing the AutomationEvent reference in a variable by using the WithEvents keyword.

Alternately, you can attach managed event handlers directly to Automation events by using the += syntax in C#, and detach them using the -= syntax. You can also use the AddEventHandler method. However, in these cases, the specified delegate must have a signature that exactly matches the Automation event signature.

For more information, see AutomationFactory. For more information about Automation, see Automation.


Events with return values are not supported. Additionally, to use C# custom delegates with Automation events that have optional parameters, you must specify default parameter values in the delegate signature. In Visual Basic, delegate parameters cannot be optional, so you must handle the EventRaised event instead.

The following code example demonstrates how to handle Automation events.

This example is part of a larger example in How to: Use Automation in Trusted Applications.

private void SearchEmail()
    UpdateStatusMessage("Searching Inbox for 'Silverlight'...");

    // The following code demonstrates three ways to handle Automation 
    // events. The first two ways use the AutomationEvent class. 
    // The last two ways require the use of a delegate with 
    // an API signature that matches the Automation event. 

    AutomationEvent searchEvent = AutomationFactory
        .GetEvent(outlook, "AdvancedSearchComplete");

    // The first way: 
    searchEvent.EventRaised += (sender, e) =>

    // The second way:
    // searchEvent.AddEventHandler(
    //    new AdvancedSearchCompleteDelegate(SearchComplete));

    // The third way:
    // outlook.AdvancedSearchComplete +=
    //    new AdvancedSearchCompleteDelegate(SearchComplete);

    // Begin the search. 
        "urn:schemas:mailheader:subject ci_phrasematch 'Silverlight'",
        true, "SubjectSearch");

// Required only with the second two ways of handling Automation events. 
private delegate void AdvancedSearchCompleteDelegate(dynamic search);

// To use custom delegates for events with optional parameters, you
// must specify default values in the delegate signature as shown here:
// private delegate void MyEventHandlerDelegate(int i, float f=77);

private void SearchComplete(dynamic search)
    List<String> searchResults = new List<String>();
    foreach (dynamic result in search.Results) 


Supported in: 5, 4

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

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

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