WPF MVVM,Prism,Command Binding

1.添加引用Microsoft.Practices.Prism.Mvvm.dll，Microsoft.Practices.Prism.SharedInterfaces.dll；

2.新建文件夹，View，ViewModel，View中添加新项FirstView.XAML(Window页面)，在ViewModel中添加新项FirstViewModel.CS(类)；

3.在FirstView.xaml.cs的构造函数中添加  DataContext=new FirstViewModel();

4.在FirstView页面，添加<Button Width="300" Height="100" FontSize="50" HorizontalAlignment="Left" VerticalAlignment="Top" BorderBrush="Black" BorderThickness="10" Command="{Binding BtnCommand}" Content="Click Here"/> 绑定命令；

5.在FirstViewModel.CS页面中添加

private ICommand _BtnCommand;

public ICommand BtnCommand
{
get
{
if (_BtnCommand == null)
{
_BtnCommand=new DelegateCommand<string>((obj)=>Add(10,20));
}
return _BtnCommand;
}
}

public void Add(int x, int y)
{
int z = x + y;
MessageBox.Show(z.ToString());
}