wpf 4.0 datagrid模板列双向绑定问题 [英] wpf 4.0 datagrid template column two-way binding problem

问题描述

我正在使用 wpf 4.0 中的数据网格.它有一个包含复选框的 TemplateColumn.复选框的 IsChecked 属性是通过绑定设置的.

I'm using the datagrid from wpf 4.0. This has a TemplateColumn containing a checkbox. The IsChecked property of the checkbox is set via binding.

问题是，即使我明确指定绑定模式为 TwoWay，它也只能在一个方向上工作.

The problem is that even if I specify the binding mode explicitly to be TwoWay, it works only in one direction.

我不得不提一下，相同的代码在 .net 3.5 中与 wpf 工具包中的数据网格完美结合.

I have to mention that the same code works perfectly in .net 3.5 with the datagrid from the wpf toolkit.

请查看 .xaml 和 .cs 内容.

Please take a look at the .xaml and .cs contents.

提前致谢，

罗兰

<Window.Resources>
    <DataTemplate
        x:Key="IsSelectedColumnTemplate">
        <CheckBox
            IsChecked="{Binding Path=IsSelected, Mode=TwoWay}"
            />
    </DataTemplate>
</Window.Resources>
<Grid>
    <DataGrid
        x:Name="dataGrid"
        AutoGenerateColumns="false"
        CanUserAddRows="False"
        CanUserDeleteRows="False"
        HeadersVisibility="Column"
        ItemsSource="{Binding}"
        >
        <DataGrid.Columns>
            <DataGridTemplateColumn 
                Header="Preselected"
                x:Name="myIsSelectedColumn" 
                CellTemplate="{StaticResource IsSelectedColumnTemplate}"
                CanUserSort="True"
                SortMemberPath="Orientation"
                Width="Auto"
                />
        </DataGrid.Columns>
    </DataGrid>
</Grid>

以及相关的 .cs 内容:

and the related .cs content:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        ObservableCollection<DataObject> DataSource = new ObservableCollection<DataObject>();
        DataSource.Add(new DataObject());    
        DataSource.Add(new DataObject());          
        dataGrid.ItemsSource = DataSource;
    }
}

public class DataObject : DependencyObject
{
    public bool IsSelected
    {
        get { return (bool)GetValue(IsSelectedProperty); }
        set { SetValue(IsSelectedProperty, value); }
    }

    // Using a DependencyProperty as the backing store for IsSelected.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty IsSelectedProperty =
        DependencyProperty.Register("IsSelected", typeof(bool), typeof(DataObject), new UIPropertyMetadata(false, OnIsSelectedChanged));

    private static void OnIsSelectedChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
        // this part is not reached
    }
}

推荐答案

您在数据模板的 Checkbox IsChecked 绑定中设置 UpdateSourceTrigger=PropertyChanged:<代码><复选框IsChecked="{Binding Path=IsSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

You set UpdateSourceTrigger=PropertyChanged in your Checkbox IsChecked binding in the datatemplate: <CheckBox IsChecked="{Binding Path=IsSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />

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