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Fix nullable event warning in interface events documentation #47684

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merged 2 commits into from
Aug 4, 2025
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Fix nullable event warning in interface events documentation #47684

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a08b3b1
Initial plan
Copilot Jul 31, 2025
24013b1
Fix nullable event warning in interface events documentation
Copilot Jul 31, 2025
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2 changes: 1 addition & 1 deletion docs/csharp/programming-guide/events/how-to-implement-interface-events.md
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ namespace ImplementInterfaceEvents
}
public class Shape : IDrawingObject
{
public event EventHandler ShapeChanged;
public event EventHandler? ShapeChanged;
void ChangeShape()
{
// Do something here before the event…
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9 changes: 3 additions & 6 deletions samples/snippets/csharp/VS_Snippets_VBCSharp/csProgGuideEvents/CS/Events.cs
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Expand Up @@ -686,21 +686,18 @@ public class MyEventArgs : EventArgs
}
public class Shape : IDrawingObject
{
public event EventHandler ShapeChanged;
public event EventHandler? ShapeChanged;
void ChangeShape()
{
// Do something here before the event�
// Do something here before the event…

OnShapeChanged(new MyEventArgs(/*arguments*/));

// or do something here after the event.
}
protected virtual void OnShapeChanged(MyEventArgs e)
{
if (ShapeChanged != null)
{
ShapeChanged(this, e);
}
ShapeChanged?.Invoke(this, e);
}
}
}
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