Question

我正在尝试将我的一个列上的数据绑定到我页面的ViewModel中的数据（而不是网格绑定的对象）。

我建议的here以下内容无效。

   <DataGridTemplateColumn>
      <DataGridTemplateColumn.CellTemplate>
         <DataTemplate>
            <Button Content="{Binding ElementName=LayoutRoot, Path=DataContext.JUNK}"></Button>
         </DataTemplate>
      </DataGridTemplateColumn.CellTemplate>
   </DataGridTemplateColumn>

在我的ViewModel

中

public string JUNK { get; set; }

在ViewModel的构造函数

中设置为"HELLO"

有谁看到我做错了什么？

修改

这是整个XAML。相关列一直在底部，在网格内的网格中

ALSO - 我无法将我的整个源码再次放到这里（不确定它是Citrix还是什么），但我采用了相同的精确绑定表达式在datagrid的按钮中工作，我将它放在除了网格之外的普通旧TextBlock的文本上，它就像一个魅力。我还在网格中添加了一个新的虚拟文本列，并为文本使用了相同的绑定表达式，它仍然不工作。看起来这个绑定表达式很好，但拒绝在网格附近的任何地方工作。

<UserControl x:Class="MainApp.WPF.ucFmvHistoryDisplayGrid"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="1000" x:Name="LayoutRoot">

<UserControl.Resources>
    <Style x:Name="rightAlignedColumn" x:Key="rightAlignedColumn" TargetType="TextBlock">
        <Setter Property="HorizontalAlignment" Value="Right" />
    </Style>

    <Style x:Name="centerAlignedColumn" x:Key="centerAlignedColumn" TargetType="TextBlock">
        <Setter Property="HorizontalAlignment" Value="Center" />
    </Style>
</UserControl.Resources>

<Grid>
    <DataGrid x:Name="dbTop" ItemsSource="{Binding PropertyGroupSource}" HorizontalAlignment="Left" Background="White" CanUserAddRows="False" CanUserDeleteRows="False" CanUserReorderColumns="False" CanUserResizeRows="False" IsReadOnly="True" AutoGenerateColumns="False" Grid.Row="1" Width="800">
        <DataGrid.Columns>
            <DataGridTextColumn Width="120" Header="Property Num" Binding="{Binding PropertyNum}"></DataGridTextColumn>
            <DataGridTextColumn Width="120" Header="Alt Description" Binding="{Binding AltDescription}"></DataGridTextColumn>
            <DataGridTextColumn Width="80" Header="County" Binding="{Binding County}"></DataGridTextColumn>
            <DataGridTextColumn Width="100" Header="State" Binding="{Binding State}" ElementStyle="{StaticResource centerAlignedColumn}"></DataGridTextColumn>
            <DataGridTextColumn Width="85" Header="Phase" Binding="{Binding Phase}"></DataGridTextColumn>
            <DataGridTextColumn Width="85" Header="FMV" Binding="{Binding FmvTotal}"></DataGridTextColumn>
            <DataGridTextColumn Width="100" Header="Assessed Value" Binding="{Binding AssessedValueTotal}"></DataGridTextColumn>
        </DataGrid.Columns>
        <DataGrid.RowDetailsTemplate>
            <DataTemplate>
                <Border Margin="5" BorderBrush="Black" BorderThickness="1">
                    <DataGrid Margin="5" Background="White" CanUserAddRows="False" CanUserDeleteRows="False" CanUserReorderColumns="False" CanUserResizeRows="False" IsReadOnly="True" AutoGenerateColumns="False" Grid.Row="1" ItemsSource="{Binding PropertyFmvSource}">
                        <DataGrid.Columns>
                            <DataGridTextColumn Width="125" Header="County Acct Num" Binding="{Binding Property.CountyAccountNum, StringFormat=d}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="80" Header="City" Binding="{Binding Property.City, StringFormat=d}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="80" Header="Jurisdiction" Binding="{Binding Property.Jurisdiction, StringFormat=d}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="80" Header="FMV Date" Binding="{Binding MostRecentFMV.FMVDate, StringFormat=d}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="100" Header="FMV" Binding="{Binding MostRecentFMV.FMV, StringFormat=N0}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="85" Header="Assess Ratio" Binding="{Binding MostRecentFMV.AssessmentRatio, StringFormat=N3}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="105" Header="Assessed Value" Binding="{Binding MostRecentFMV.AssessedValue, StringFormat=N0}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTemplateColumn>
                                <DataGridTemplateColumn.CellTemplate>
                                    <DataTemplate>
                                        <Button Content="{Binding ElementName=LayoutRoot, Path=DataContext.JUNK}"></Button>
                                    </DataTemplate>
                                </DataGridTemplateColumn.CellTemplate>
                            </DataGridTemplateColumn>
                        </DataGrid.Columns>
                    </DataGrid>
                </Border>
            </DataTemplate>
        </DataGrid.RowDetailsTemplate>
    </DataGrid>
</Grid>

Answer 1

使用RelativeSource绑定绑定到包含DataGrid的DataContext应该有效：

<Button Content="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=DataGrid, AncestorLevel=2}, Path=DataContext.JUNK}"></Button>

当您嵌套DataGrids时，必须将AncestorLevel设置为“2”以绑定到最外层DataGrid的DataContext。

Answer 2

更新

@Danny Shisler的回答是正确的。留下这个答案，因为它显示了如何在DataGridColumn内部进行绑定，这些绑定不在Visual Tree中，并且没有DataContext

以下是一篇博文，介绍了此问题的解决方法：http://blogs.infragistics.com/blogs/josh_smith/archive/2008/06/26/data-binding-the-isvisible-property-of-contextualtabgroup.aspx

解决方法是创建一个看起来像这样的DataContextSpy

<强> DataContextSpy

public class DataContextSpy
: Freezable // Enable ElementName and DataContext bindings
{
    public DataContextSpy()
    {
        // This binding allows the spy to inherit a DataContext.
        BindingOperations.SetBinding(this, DataContextProperty, new Binding());
    }

    public object DataContext
    {
        get { return (object)GetValue(DataContextProperty); }
        set { SetValue(DataContextProperty, value); }
    }

    // Borrow the DataContext dependency property from FrameworkElement.
    public static readonly DependencyProperty DataContextProperty =
        FrameworkElement.DataContextProperty.AddOwner(typeof(DataContextSpy));

    protected override Freezable CreateInstanceCore()
    {
        // We are required to override this abstract method.
        throw new NotImplementedException();
    }
}

然后你可以使用DataContextSpy的实例作为DataGridColumn s中绑定的来源

<Grid Name="LayoutRoot">
    <Grid.Resources>
        <local:DataContextSpy x:Key="dataContextSpy" />
    </Grid.Resources>
    <DataGrid ...>
        <DataGrid.Columns>
            <DataGridTemplateColumn Header="{Binding Path=DataContext.JUNK,
                                           Source={StaticResource dataContextSpy}}">
                <!--..-->
            </DataGridTemplateColumn>
            <!--..-->
        </DataGrid.Columns>
    </DataGrid>
</Grid>

WPF DataGrid - 数据绑定列到Page的ViewModel

2 个答案: