Prism框架下对Grid鼠标点击做命令绑定

使用Interaction.Triggers可以对依赖属性进行命令响应，适合在Prism框架中使用ViewModel进行命令绑定。

使用Interaction需要引用System.Windows.Interactivity。

参考：WPF how to bind mousedown (command/action) to label

1、View

    "{StaticResource BorderRegion}">
        
            
                "PreviewMouseDown">
                    "{Binding SelectGridCommand}"/>
                
            
        
    

2、ViewModel

public class WindowViewModel : BindableBase
{
    public DelegateCommand SelectGridCommand { get; }

    public WindowViewModel()
    {
        SelectGridCommand = new DelegateCommand(SelectGrid, CanExecute);
    }
    
    private static bool CanExecute()
    {
        return true;
    }

    private void SelectGrid()
    {
    }
}