WPF DataGrid - 数据绑定列到Page的ViewModel

Question

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

我在这里推荐的是无效的.

   <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; }

这是"HELLO"在ViewModel的构造函数中设置的

有谁看到我做错了什么？

编辑

这是整个XAML.相关列一直位于网格内的网格底部

另外 - 我无法将我的整个源码再次放到这里(不确定它是否为Citrix或者是什么),但是我采用了与 datagrid按钮无关的完全相同的绑定表达式,并将其放到了一个普通的旧文本上TextBlock除了网格之外,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,但它仍然无效.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 应该可以工作：

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

当您嵌套 DataGrid 时，AncestorLevel 必须设置为“2”才能绑定到最外层 DataGrid 的 DataContext。