EventHandlerType Property
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EventInfo.EventHandlerType Property

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Gets the Type object of the underlying event-handler delegate associated with this event.

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

'Declaration
Public Overridable ReadOnly Property EventHandlerType As Type

Property Value

Type: System.Type
The delegate event handler.

The following example uses the EventHandlerType property to discover the delegate type of an event and to display its parameter types.

The example defines a delegate named MyDelegate and an event named MyEvent 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.


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&


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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