1、全局的ViewModel绑定：
a）设定全局的ViewModel（App.xaml中）：
1 <Application x:Class="MyTest.App"
2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
4 xmlns:local="clr-namespace:MyTest"
5 StartupUri="MainWindow.xaml">
6 <Application.Resources>
7 <local:MainViewModel x:Key="mainVM"/>
8 </Application.Resources>
9 </Application>
b）绑定全局的ViewModel（MainWindow中）：
1 <Window x:Class="MyTest.MainWindow"
2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
4 xmlns:local="clr-namespace:MyTest"
5 Title="MainWindow" Height="600" Width="850" WindowStartupLocation="CenterScreen"
6 DataContext="{DynamicResource mainVM}">
7 </Window>
2、单独的ViewModel绑定（MainWindow中）：
1 <Window x:Class="MyTest.MainWindow"
2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
4 xmlns:local="clr-namespace:MyTest"
5 Title="MainWindow" Height="600" Width="850" WindowStartupLocation="CenterScreen">
6 <Window.DataContext>
7 <local:MainViewModel/>
8 </Window.DataContext>
9 </Window>