绑定数据网格按钮 mvvm

Question

我有数据网格，其中一列是按钮列，我想将此单击绑定到视图模型，但它没有到达视图模型功能。<DataGrid  CanUserAddRows="False" AutoGenerateColumns="False"  ItemsSource="{Binding TableComments}" SelectedItem="{Binding SelectedRow}"     x:Name="dataGrid" >    <DataGrid.Columns >                           <DataGridTemplateColumn Header="Delete">            <DataGridTemplateColumn.CellTemplate>                 <DataTemplate>                    <Button Command="{Binding DeleteCommentCommand}" >Delete</Button>                 </DataTemplate>             </DataGridTemplateColumn.CellTemplate>         </DataGridTemplateColumn>   </DataGrid.Columns></DataGrid>在视图模型中：public ICommand DeleteCommentCommand { get; private set; }public MyViewModel(){   DeleteCommentCommand = new RelayCommand(Delete);}void Delete(){}我感觉问题出在这一行： <Button Command="{Binding DeleteCommentCommand}" >Delete</Button>

Answer 1

DeleteCommentCommand绑定到 DataGrid item DataContext，而不是 DataGridDataContext本身（ViewModel）。您应该设置适当的 DataContextCellTemplate或更新一点绑定，例如

Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Path=DataContext.DeleteCommentCommand}"

您还可以更新命令并将参数传递给RelayCommand方法Delete

public MyViewModel()

{

   DeleteCommentCommand = new RelayCommand(item => Delete(item));

}

void Delete(object item)

{

}

并在xaml中传递值CommandParameter="{Binding}"