- e
- An System.EventArgs that contains the event data.
Visual Basic (Usage) | ![]() |
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Dim instance As RasterImagePanViewer Dim e As EventArgs instance.OnLostFocus(e) |
C++/CLI | |
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protected: void OnLostFocus( EventArgs^ e ) override |
Parameters
- e
- An System.EventArgs that contains the event data.
This example overrides the virtual events of the RasterImagePanViewer class.
Visual Basic | ![]() |
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Public Class MyRasterImagePanViewer Inherits RasterImagePanViewer '. '. '. Protected Overrides Sub OnViewerChanged(ByVal e As EventArgs) MyBase.OnViewerChanged(e) Console.WriteLine("OnViewerChanged is called") End Sub Protected Overrides Sub OnRectangleColorChanged(ByVal e As EventArgs) MyBase.OnRectangleColorChanged(e) Console.WriteLine("OnRectangleColorChanged is called") End Sub Protected Overrides Sub OnImageColorChanged(ByVal e As EventArgs) MyBase.OnImageColorChanged(e) Console.WriteLine("OnImageColorChanged is called") End Sub Protected Overrides Sub OnClipCursorChanged(ByVal e As EventArgs) MyBase.OnClipCursorChanged(e) Console.WriteLine("OnClipCursorChanged is called") End Sub Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs) MyBase.OnPaint(e) Console.WriteLine("OnPaint is called") End Sub Protected Overrides Sub OnMouseDown(ByVal e As MouseEventArgs) MyBase.OnMouseDown(e) Console.WriteLine("OnMouseDown is called") End Sub Protected Overrides Sub OnMouseMove(ByVal e As MouseEventArgs) MyBase.OnMouseMove(e) Console.WriteLine("OnMouseMove is called") End Sub Protected Overrides Sub OnMouseUp(ByVal e As MouseEventArgs) MyBase.OnMouseUp(e) Console.WriteLine("OnMouseUp is called") End Sub Protected Overrides Sub OnLostFocus(ByVal e As EventArgs) MyBase.OnLostFocus(e) Console.WriteLine("OnLostFocus is called") End Sub Protected Overrides Sub OnSizeChanged(ByVal e As EventArgs) MyBase.OnSizeChanged(e) Console.WriteLine("OnSizeChanged is called") End Sub End Class |
C# | ![]() |
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public class MyRasterImagePanViewer : RasterImagePanViewer { //. //. //. protected override void OnViewerChanged(EventArgs e) { base.OnViewerChanged(e); Console.WriteLine("OnViewerChanged is called"); } protected override void OnRectangleColorChanged(EventArgs e) { base.OnRectangleColorChanged(e); Console.WriteLine("OnRectangleColorChanged is called"); } protected override void OnImageColorChanged(EventArgs e) { base.OnImageColorChanged(e); Console.WriteLine("OnImageColorChanged is called"); } protected override void OnClipCursorChanged(EventArgs e) { base.OnClipCursorChanged(e); Console.WriteLine("OnClipCursorChanged is called"); } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); Console.WriteLine("OnPaint is called"); } protected override void OnMouseDown(MouseEventArgs e) { base.OnMouseDown(e); Console.WriteLine("OnMouseDown is called"); } protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); Console.WriteLine("OnMouseMove is called"); } protected override void OnMouseUp(MouseEventArgs e) { base.OnMouseUp(e); Console.WriteLine("OnMouseUp is called"); } protected override void OnLostFocus(EventArgs e) { base.OnLostFocus(e); Console.WriteLine("OnLostFocus is called"); } protected override void OnSizeChanged(EventArgs e) { base.OnSizeChanged(e); Console.WriteLine("OnSizeChanged is called"); } } |
Raising an event invokes the event handler through a delegate.
The OnLostFocus method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to Inheritors When overriding OnLostFocus in a derived class, be sure to call the base class's OnLostFocus method so that registered delegates receive the event.
Target Platforms: Microsoft .NET Framework 2.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7