当位于非主 TabItem 内时，MVVM 绑定在 DataGrid 列标题中不起作用

Question

我在辅助 TabItem 中有一个 DataGrid，我想将视图模型中的一些数据绑定到标题。我能够将数据绑定到主 TabItem 中的 DataGrid 标题，但相同的代码不适用于辅助 TabItem。我遵循了以下问题的答案，但它仍然不起作用，我不确定出了什么问题。我不太确定我的数据上下文是否不正确或者我的绑定设置是否正确。

在非主 TabItem 内时，绑定在 DataGrid 列标题中不起作用

这是我的代码：

XAML

<Window xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"  

        x:Class="TestWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        mc:Ignorable="d"

        Title="Test Window" Height="645" Width="900">

    <StackPanel Orientation="Vertical">

        <TabControl>

            <TabItem Name="Primary_Tab" Header="Primary Tab">

                <!--Mock Data Grid-->

            </TabItem>

            <TabItem Name="Secondary_Tab" Header="Secondary Tab">

                <DataGrid Height="500" ItemsSource="{Binding GridDetails}" HorizontalAlignment="Left" VerticalAlignment="Top" AutoGenerateColumns="False" CanUserAddRows="False">

                    <DataGrid.Resources>

                        <local:BindingProxy x:Key="proxy" Data="{Binding}" />

                    </DataGrid.Resources>

                    <DataGrid.Columns>

                        <DataGridTextColumn x:Name="Name" Header="Name" Binding="{Binding Path='Name', Mode=OneTime}" IsReadOnly="True" Width="200" />

                        <DataGridTextColumn x:Name="ID" Header="ID" Binding="{Binding Path='ID', Mode=OneTime}" IsReadOnly="True" Width="100">

                            <DataGridTextColumn.ElementStyle>

                                <Style TargetType="{x:Type TextBlock}">

                                    <Setter Property="HorizontalAlignment" Value="Center" />

                                </Style>

                            </DataGridTextColumn.ElementStyle>

Answer 1

我终于设法解决了绑定问题。看起来我有一堆不必要的绑定上下文代码，它们干扰了代理绑定。对于将来遇到同样问题的任何人来说，这对我有用。请注意，我根本不必更改视图模型或 BindingProxy 类。只需要在 XAML 部分做一些工作。<Window xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; x:Class="TestWindow"&nbsp; &nbsp; &nbsp; &nbsp; xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"&nbsp; &nbsp; &nbsp; &nbsp; xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"&nbsp; &nbsp; &nbsp; &nbsp; xmlns:d="http://schemas.microsoft.com/expression/blend/2008"&nbsp; &nbsp; &nbsp; &nbsp; xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"&nbsp; &nbsp; &nbsp; &nbsp; mxlns:local="clr-namespace:MyNamespace"&nbsp; &nbsp; &nbsp; &nbsp; mc:Ignorable="d"&nbsp; &nbsp; &nbsp; &nbsp; Title="Test Window" Height="645" Width="900">&nbsp; &nbsp; <StackPanel Orientation="Vertical">&nbsp; &nbsp; &nbsp; &nbsp; <TabControl>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <TabItem Name="Primary_Tab" Header="Primary Tab">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <!--Mock Data Grid-->&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </TabItem>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <TabItem Name="Secondary_Tab" Header="Secondary Tab">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGrid Height="500" ItemsSource="{Binding GridDetails}" HorizontalAlignment="Left" VerticalAlignment="Top" AutoGenerateColumns="False" CanUserAddRows="False">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGrid.Resources>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <local:BindingProxy x:Key="proxy" Data="{Binding}" />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGrid.Resources>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGrid.Columns>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn x:Name="Name" Header="Name" Binding="{Binding Path='Name', Mode=OneTime}" IsReadOnly="True" Width="200" />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn x:Name="ID" Header="ID" Binding="{Binding Path='ID', Mode=OneTime}" IsReadOnly="True" Width="100">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn.ElementStyle>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <Style TargetType="{x:Type TextBlock}">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <Setter Property="HorizontalAlignment" Value="Center" />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </Style>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGridTextColumn.ElementStyle>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGridTextColumn>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn x:Name="NumClaims" Binding="{Binding Path='NumClaims', Mode=OneTime}" IsReadOnly="True" Width="100">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn.Header>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <StackPanel>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <TextBlock Text="Claims"/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <TextBlock Text="{Binding Path=Data.TotalClaims, UpdateSourceTrigger=PropertyChanged, Source={StaticResource proxy}}" />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </StackPanel>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGridTextColumn.Header>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn.ElementStyle>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <Style TargetType="{x:Type TextBlock}">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <Setter Property="HorizontalAlignment" Value="Center" />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </Style>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGridTextColumn.ElementStyle>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGridTextColumn>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn x:Name="NewClaims" Binding="{Binding Path='NumNewClaims', Mode=OneTime}" IsReadOnly="True" Width="80">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn.Header>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <StackPanel>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <TextBlock Text="New Claims"/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <TextBlock Text="{Binding Path=Data.TotalNewClaims, UpdateSourceTrigger=PropertyChanged, Source={StaticResource proxy}}" />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </StackPanel>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGridTextColumn.Header>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn.CellStyle>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <Style TargetType="{x:Type DataGridCell}">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <Setter Property="Background" Value="{Binding NumNewClaims}"/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </Style>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGridTextColumn.CellStyle>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <DataGridTextColumn.ElementStyle>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <Style TargetType="{x:Type TextBlock}">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <Setter Property="HorizontalAlignment" Value="Center" />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </Style>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGridTextColumn.ElementStyle>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGridTextColumn>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGrid.Columns>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </DataGrid>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </TabItem>&nbsp; &nbsp; &nbsp; &nbsp; </TabControl>&nbsp; &nbsp; </StackPanel></Window>