如何将WPFToolkit-Datagrid的selectedItem属性绑定到我的viewmodel属性？

问题描述

我有一个WPFToolkit-datagrid和一个具有属性的View-model类 - SelectedGridItems
如何将WPFToolkit-Datagrid的selectedItem属性绑定到viewmodel属性（SelectedGridItems）？

I have a WPFToolkit-datagrid and a View-model class with a property - "SelectedGridItems"How do I bind selectedItem property of WPFToolkit-Datagrid to my viewmodel property ("SelectedGridItems") ?

推荐答案

这是一个附加属性，它挂接到ListBox的SelectionChanged事件，并将所选项目列表填充到ViewModel。您可以简单地将ListBox更改为DataGrid。

Here is an attached property that hooks to the SelectionChanged event of the ListBox and populates a list of selected items to the ViewModel. You can simply change "ListBox" to "DataGrid".

编辑：添加DataGrid版本的源代码...

Adding source code for DataGrid version...

/// <summary>
/// Attached property that stores the selected items of a DataGrid
/// </summary>
public static class DataGridService
{
   #region SelectedItems

   /// <summary>
   /// SelectedItems Attached Dependency Property
   /// </summary>
   public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.RegisterAttached(
       "SelectedItems",
       typeof(IList),
       typeof(DataGridService),
       new FrameworkPropertyMetadata((IList)null, new PropertyChangedCallback(OnSelectedItemsChanged)));

   /// <summary>
   /// Gets the SelectedItems property.
   /// </summary>
   /// <param name="d"><see cref="DependencyObject"/> to get the property from</param>
   /// <returns>The value of the SelectedItems property</returns>
   public static IList GetSelectedItems(DependencyObject d)
   {
      return (IList)d.GetValue(SelectedItemsProperty);
   }

   /// <summary>
   /// Sets the SelectedItems property.
   /// </summary>
   /// <param name="d"><see cref="DependencyObject"/> to set the property on</param>
   /// <param name="value">value of the property</param>
   public static void SetSelectedItems(DependencyObject d, IList value)
   {
      d.SetValue(SelectedItemsProperty, value);
   }

   /// <summary>
   /// Handles changes to the SelectedItems property.
   /// </summary>
   /// <param name="d"><see cref="DependencyObject"/> that fired the event</param>
   /// <param name="e">A <see cref="DependencyPropertyChangedEventArgs"/> that contains the event data.</param>
   private static void OnSelectedItemsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   {
      var grid = (DataGrid)d;
      ReSetSelectedItems(grid);
      grid.SelectionChanged += delegate
      {
         ReSetSelectedItems(grid);
      };
   }

   /// <summary>
   /// Sets the selected items collection for the specified <see cref="DataGrid"/>
   /// </summary>
   /// <param name="grid"><see cref="DataGrid"/> to use for setting the selected items</param>
   private static void ReSetSelectedItems(DataGrid grid)
   {
      IList selectedItems = GetSelectedItems(grid);
      selectedItems.Clear();
      if (grid.SelectedItems != null)
      {
         foreach (var item in grid.SelectedItems)
         {
            selectedItems.Add(item);
         }
      }
   }

   #endregion
}

在XAML中：

<tk:DataGrid ... local:DataGridService.SelectedItems="{Binding Path=MyCollection}" SelectionMode="Extended">

MyCollection应该是ViewModel中的一个ObservableCollection。

"MyCollection" should be an ObservableCollection in your ViewModel.

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