WPF 通過 CommandParameter 傳遞當前窗體到 ViewModel

在應用 Command 模式中，需要在View上點擊 一個按鈕，需要將當前窗體作為參數傳遞為 command


兩種方式傳遞當前窗體
1、通過窗體名稱（假設窗體名稱為 ThisWindow）

   <ButtonCommand="CancelCommand"CommandParameter="{Binding ElementName=ThisWindow}"/>


2、綁定到 RelativeSource

<ButtonCommand="CancelCommand"CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}"/>

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以下是ViewModel中的 Command 代碼

        private DelegateCommand<Window> _cancelCommand = null;

        public DelegateCommand<Window> CancelCommand
        {
            get
            {
                if (_cancelCommand == null)
                {
                    _cancelCommand = new DelegateCommand<Window>(Cancel);
                }

                return _cancelCommand;
            }
        }
 
        void Cancel(Window window)
        {    
            if (window != null)
            {  
                window.DialogResult = false;
                window.Close();
            }
        }


參考網址：http://stackoverflow.com/questions/3504332/passing-the-current-window-as-a-commandparameter