下面是我的demo

XAML:

 <DataGrid ItemsSource="{Binding}"   Name="c1datagrid"   AutoGenerateColumns="False" EnableRowVirtualization="True" EnableColumnVirtualization="True">
            <DataGrid.Columns>
                <DataGridTextColumn Header="A" Binding="{Binding A}"></DataGridTextColumn>  </DataGrid.Columns>
 </DataGrid>

CS:

声明两个集合:

        ObservableCollection<test1> ls;
        ObservableCollection<test1> cc;

        this.c1datagrid.DataContext = ls;

初始化的时候赋值,并绑定给datacontext;

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            ls = cc;
        }

点击按钮给集合切换内容,但是界面不变化