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AutomationEventArgs.EventId Property

Gets the event identifier.

Namespace:  System.Windows.Automation
Assembly:  UIAutomationTypes (in UIAutomationTypes.dll)

public AutomationEvent EventId { get; }

Property Value

Type: System.Windows.Automation.AutomationEvent
The event identifier.

If a client has added event handlers for more than one event using the same AutomationEventHandler instance, EventId can be used to identify the event that the delegate should process.

In the following example, the event handler checks the EventId of the event and handles the event accordingly.

/// <summary> 
/// AutomationEventHandler delegate. 
/// </summary> 
/// <param name="src">Object that raised the event.</param>
/// <param name="e">Event arguments.</param>
private void OnUIAutomationEvent(object src, AutomationEventArgs e)
{
    // Make sure the element still exists. Elements such as tooltips 
    // can disappear before the event is processed.
    AutomationElement sourceElement;
    try
    {
        sourceElement = src as AutomationElement;
    }
    catch (ElementNotAvailableException)
    {
        return;
    }
    if (e.EventId == InvokePattern.InvokedEvent)
    {
        // TODO Add handling code.
    }
    else
    {
        // TODO Handle any other events that have been subscribed to.
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
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