我有一个 WPFToolkit-datagrid 和一个带有属性的视图模型类 - “SelectedGridItems” 如何将 WPFToolkit-Datagrid 的 selectedItem 属性绑定到我的 viewmodel 属性（“SelectedGridItems”）？
【问题讨论】：
标签： wpf datagrid viewmodel selecteditem
这是一个附加属性，它与 ListBox 的 SelectionChanged 事件挂钩，并将所选项目的列表填充到 ViewModel。您可以简单地将“ListBox”更改为“DataGrid”。
http://marlongrech.wordpress.com/2009/06/02/sync-multi-select-listbox-with-viewmodel/
编辑：为 DataGrid 版本添加源代码...
/// <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 ObservableCollection。
【讨论】：
这是 WPF4 的 DataGrid 的代码，我目前无法访问 Toolkit，但我怀疑它是否有所不同。
用于绑定数据网格中的单行：
<DataGrid ItemsSource="{Binding ViewModelCollectionProperty}"
SelectedItem="{Binding Path=ViewModelProperty}">
</DataGrid>
要绑定多个选定的行，最好的办法可能是创建一个附加属性，该属性维护一组选定项，然后可以将数据绑定到视图模型。
编辑 -- 在下方添加链接
有关创建附加属性的文章与您想要的非常相似，请参见此处： http://alexshed.spaces.live.com/Blog/cns!71C72270309CE838!149.entry
【讨论】：