WPF 4.0数据网格模板柱双向绑定的问题 [英] wpf 4.0 datagrid template column two-way binding problem

问题描述

我使用WPF从4.0 DataGrid中。这有一个包含复选框中TemplateColumn中。复选框的财产器isChecked通过绑定设置。

问题是，即使我明确地指定绑定模式为双向，它只能在一个方向。

我要提的是，同样的code完全在.NET 3.5从WPF工具包数据网格。

请看看的的.xaml和内容的.cs。

由于提前，

罗兰

 ＆LT; Window.Resources＆GT;
    ＆LT;的DataTemplate
        X：键=IsSelectedColumnTemplate＆GT;
        ＆LT;复选框
            器isChecked ={绑定路径= IsSelected，模式=双向}
            /＆GT;
    ＆LT; / DataTemplate中＆GT;
＆LT; /Window.Resources>
＆LT;网格和GT;
    ＆LT;数据网格
        X：名称=的数据网格
        的AutoGenerateColumns =假
        CanUserAddRows =假
        CanUserDeleteRows =假
        HeadersVisibility =列
        的ItemsSource ={结合}
        ＆GT;
        ＆LT; D​​ataGrid.Columns＆GT;
            ＆LT; D​​ataGridTemplateColumn
                标题=preselected
                X：NAME =myIsSelectedColumn
                CellTemplate ={StaticResource的IsSelectedColumnTemplate}
                CanUserSort =真
                SortMemberPath =方向
                WIDTH =自动
                /＆GT;
        ＆LT; /DataGrid.Columns>
    ＆LT; / DataGrid的＆GT;
＆LT; /网格和GT;
 

和相关的.cs内容：

 公共部分类主窗口：窗口
{
    公共主窗口（）
    {
        的InitializeComponent（）;        的ObservableCollection＆LT;＆数据对象GT;数据源=新的ObservableCollection＆LT;＆数据对象GT;（）;
        DataSource.Add（新数据对象（））;
        DataSource.Add（新数据对象（））;
        dataGrid.ItemsSource =数据源;
    }
}公共类数据对象：DependencyObject的
{
    公共BOOL IsSelected
    {
        {返回（布尔）的GetValue（IsSelectedProperty）; }
        集合{的SetValue（IsSelectedProperty，值）; }
    }    //使用的DependencyProperty作为后备存储IsSelected。这使得动画造型，装订等..
    公共静态只读的DependencyProperty IsSelectedProperty =
        DependencyProperty.Register（IsSelected的typeof（布尔）的typeof（数据对象），新UIPropertyMetadata（假，OnIsSelectedChanged））;    私有静态无效OnIsSelectedChanged（OBJ的DependencyObject，DependencyPropertyChangedEventArgs E）
    {
        //没有达到这部分
    }
}
 

解决方案

您在您的复选框中器isChecked的DataTemplate中绑定设置UpdateSourceTrigger = PropertyChanged的：
＆LT;复选框
            器isChecked ={绑定路径= IsSelected，模式=双向，UpdateSourceTrigger =的PropertyChanged}
            /＆GT;


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.

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

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

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

Thanks in advance,

Roland

<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>

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
    }
}

解决方案

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

这篇关于WPF 4.0数据网格模板柱双向绑定的问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！