委托/事件的重写
                            
                            
                            public new event ProgressChangedEventHandler ProgressChanged
??????? {
??????????? add
??????????? {
??????????????? base.ProgressChanged += value;
??????????? }
??????????? remove
??????????? {
??????????????? base.ProgressChanged -= value;
??????????? }
??????? }
                        
                        
                        ??????? {
??????????? add
??????????? {
??????????????? base.ProgressChanged += value;
??????????? }
??????????? remove
??????????? {
??????????????? base.ProgressChanged -= value;
??????????? }
??????? }
轉載于:https://www.cnblogs.com/djian/archive/2011/04/07/2007450.html
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