Mvvm绑定datagrid或listview的selectItems的方法[转]

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");
                        }
                    );
            }
        }