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");
}
);
}
}