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如何从DataGridMVVM WPF项目中选择多个项目？

在底部看到我的答案

只是在WPF上做一些轻量级阅读,我需要从DataGrid绑定selectedItems,但我无法想出任何有形的东西.我只需要选定的对象.

数据网格:

<DataGrid Grid.Row="5" 
    Grid.Column="0" 
    Grid.ColumnSpan="4" 
    Name="ui_dtgAgreementDocuments"
    ItemsSource="{Binding Path=Documents, Mode=TwoWay}"
    SelectedItem="{Binding Path=DocumentSelection, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
    HorizontalAlignment="Stretch" 
    VerticalAlignment="Stretch" 
    Background="White"
    SelectionMode="Extended" Margin="2,5" 
    IsReadOnly="True" 
    CanUserAddRows="False" 
    CanUserReorderColumns="False" 
    CanUserResizeRows="False"
    GridLinesVisibility="None" 
    HorizontalScrollBarVisibility="Hidden"
    columnHeaderStyle="{StaticResource GreenTea}" 
    HeadersVisibility="Column" 
    BorderThickness="2" 
    BorderBrush="LightGray" 
    CellStyle="{StaticResource NonSelectableDataGridCellStyle}"
    SelectionUnit="FullRow" 
    HorizontalContentAlignment="Stretch" AutoGenerateColumns="False">