예제 #1
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 public abstract void Remove(DrawingElement d);
예제 #2
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 public override void Remove(DrawingElement d)
 {
     elements.Remove(d);
 }
예제 #3
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 public abstract void Add(DrawingElement d);
예제 #4
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 public override void Add(DrawingElement d)
 {
     elements.Add(d);
 }