Question

我有一个绑定到IList的DataGrid，并显示一个类型为Equipment的列表。我接下来创建了一个ContextMenu，它是DataGrid的一部分，它不具有命令，但我可以使用其他名称。我接下来要做的是选择DataGrid中的任何单个单元格，右键单击并在上下文菜单中选择一个新名称，并将数据网格中的当前值替换为上下文菜单中的当前标记/值。我使用MVVM模式这样做，所以使用MainWindow.xaml.cs中的代码不是一个有效的选项。

我是如何实现我的DataGrid并发布数据的。

MainWindow.xaml
{
<DataGrid Background="Gray" SelectionUnit="CellOrRowHeader" Grid.ColumnSpan="9" Grid.RowSpan"2" Name="equipmentGrid" VerticalScrollBarVisibility="Visible" ItemsSource="{Binding Path=EquipmentList}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Equip Key" Binding="{Binding EquipKey}"/>
<DataGridTextColumn Header="Equip Name" Binding="{Binding EquipName}"/>
</DataGrid.Columns>
</DataGrid>

我如何实现我的ContextMenu

EquipmentIdFixViewModel
{
     private IList<Emitter> Emitters;
      ....
      public ICommand CreateContextMenuCommand
        {
          {
            get
               {
                  if(this._createContextMenuCommand == null)
                      {
                       this._createContextMenuCommand = new RelayCommand(a => this.CreateContextMenu(), p => this.CheckCondition());
                       return this._createContextCommand;
                      }
                  return this._createContextMenuCommand;
                }
            set
     {
            _this._createContextCommand = value;
            OnPropertyChanged("CreateContextMenuCommand");
     }
  }
public ContextMenu EmitterContextMenu
{
 get{return _emitterContextMenu;}
 set{_emitterContextMenu = value; OnPropertyChanged("EmitterContextMenu");}
}
public void CreateContextMenu()
{
  var contextMenu = new ContextMenu()
  Emitters = new EmitterList().GetAll();
  foreach (Emitter in  Emitters)
  {
    MenuItem item = new MenuIten();
    item.Header = emitter.EmitterName;
    item.Tag = emitter;
    item.Click += MenuItem_Click
    contextMenu.Items.Add(item);
  }
   EmitterContextMenu = contextMenu;
}

private void MenuItem_Click(object sender, RoutedEventArgs e)
 {
    var myObj = (Emitter)((MenuItem)sender).Tag;
    Equipment et = this._grid.SelectedItem as Equipment; //Doesn't work.Ends up being null. Can't figure out how to capture the data from the DataGrid
    et.EquipKey = myObj.EmitterName;
  }
}

会发生什么是et is null。如何获取DataGrid中显示的信息的参考？

如何使用MVVM将DataGrid中的特定单元格值更改为位于DataGrid的ContextMenu中的值

0 个答案: