WPF 通过 CommandParameter 传递当前窗体到 ViewModel

在应用 Command 模式中，需要在View上点击 一个按钮，需要将当前窗体作为参数传递为 command

两种方式传递当前窗体
1、通过窗体名称（假设窗体名称为 ThisWindow）

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

2、绑定到 RelativeSource

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

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以下是ViewModel中的 Command 代码

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();
            }
        }

参考网址：http://stackoverflow.com/questions/3504332/passing-the-current-window-as-a-commandparameter