Mvvm绑定datagrid或listview的selectItems的方法

单选，很简单，将SelectedItem与ViewModel的属性进行双向绑定就OK了

多选，由于ListView的SelectedItems不能进行绑定，需要将ListView的SelectionChanged事件转换成命令绑定到ViewModel，同时将SelectedItems传递到ViewModel层

示例：
首先添加程序集引用System.Windows.Interactivity.dll

xaml
添加命名空间引用

HTML code

<UserControl ... xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" />

HTML code

<ListView ItemsSource="{Binding Source={StaticResource CustomerGroups}}" x:Name="dataGrid1" > <ListView.GroupStyle> <StaticResourceExtension ResourceKey="CustomerGroupStyle" /> </ListView.GroupStyle> <ListView.View> <GridView> <GridView.Columns> <GridViewColumn DisplayMemberBinding="{Binding DisplayName,Mode=OneWay}" Header="Name" /> <GridViewColumn DisplayMemberBinding="{Binding Email,Mode=OneWay}" Header="E-Mail" /> <GridViewColumn DisplayMemberBinding="{Binding TotalSales,Mode=OneWay, ConverterCulture=zh-CN, StringFormat=c}" Header="Total Sales" /> </GridView.Columns> </GridView> </ListView.View> <i:Interaction.Triggers> <i:EventTrigger EventName="SelectionChanged"> <i:InvokeCommandAction Command="{Binding SelectionChangeCommand}" CommandParameter="{Binding SelectedItems,ElementName=dataGrid1}"/> </i:EventTrigger> </i:Interaction.Triggers> </ListView>

viewmodel：

C# code

public RelayCommand<IList> SelectionChangeCommand { get { return new RelayCommand<IList> ( (selectedItems) => { TotalSelectedSales = 0; CustomerViewModel firstCustomer = null; if (selectedItems.Count > 0) firstCustomer = selectedItems[0] as CustomerViewModel; // 将选中第一条CustomerViewModel传递到主页面 selectedCustomer = firstCustomer; // 更新按钮的可执行状态 EditCustomerCommand.RaiseCanExecuteChanged(); DeleteCustomerCommand.RaiseCanExecuteChanged(); foreach (dynamic Item in selectedItems) TotalSelectedSales += Item.TotalSales; RaisePropertyChanged("TotalSelectedSales"); } ); } }