将外键属性绑定到 DataGrid ViewSource

Question

我有这个型号： Model 我有一个通过 collectionViewSource 显示组件信息的数据网格，我想要一个 ComboBoxColumn 来显示组件的 programmer.name，并在展开组合框时显示所有其他程序员，以便用户可以更改谁来编程零件。这是我的代码：

    public partial class MainWindow : Window
{

    trackerDBEntities context = new trackerDBEntities();
    CollectionViewSource componentViewSource;

    public MainWindow()
    {
        InitializeComponent();

        componentViewSource = ((CollectionViewSource)(FindResource("componentViewSource")));
        DataContext = this;

    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        System.Windows.Data.CollectionViewSource componentViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("componentViewSource")));
        // Load data by setting the CollectionViewSource.Source property:
        context.Components.Load();
        componentViewSource.Source = context.Components.Local;

    }
}

XAML:

<Window x:Class="ToolbarDBIntegration.MainWindow"
    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"
    xmlns:local="clr-namespace:ToolbarDBIntegration"
    mc:Ignorable="d"
    Title="MainWindow" Loaded="Window_Loaded">
<Window.Resources>
    <CollectionViewSource x:Key="componentViewSource" d:DesignSource="{d:DesignInstance {x:Type local:Component}, CreateList=True}"/>
</Window.Resources>
<Grid DataContext="{StaticResource componentViewSource}">
    <DataGrid x:Name="componentDataGrid" AutoGenerateColumns="False" EnableRowVirtualization="True" ItemsSource="{Binding}" RowDetailsVisibilityMode="VisibleWhenSelected">
        <DataGrid.Columns>
            <DataGridTextColumn x:Name="compFilePathColumn" Binding="{Binding CompFilePath}" Header="Comp File Path" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="compNameColumn" Binding="{Binding CompName}" Header="Comp Name" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="departmentIdColumn" Binding="{Binding DepartmentId}" Header="Department Id" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="designerColumn" Binding="{Binding Designer}" Header="Designer" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="idColumn" Binding="{Binding Id}" Header="Id" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="jobIdColumn" Binding="{Binding JobId}" Header="Job Id" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="materialColumn" Binding="{Binding Material}" Header="Material" Width="SizeToHeader"/>
            <DataGridTemplateColumn x:Name="postedDateColumn" Header="Posted Date" Width="SizeToHeader">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <DatePicker SelectedDate="{Binding PostedDate, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTemplateColumn x:Name="programmerColumn" Header="Programmer" Width="SizeToHeader">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <ComboBox>
                            <ComboBoxItem Content="{Binding Programmer.Name}" IsSelected="True"/>
                        </ComboBox>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTextColumn x:Name="programmer_IdColumn" Binding="{Binding Programmer_Id}" Header="Programmer Id" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="qtyMirColumn" Binding="{Binding QtyMir}" Header="Qty Mir" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="qtyShnColumn" Binding="{Binding QtyShn}" Header="Qty Shn" Width="SizeToHeader"/>
            <DataGridCheckBoxColumn x:Name="statusColumn" Binding="{Binding Status}" Header="Status" Width="SizeToHeader"/>
            <DataGridTemplateColumn x:Name="timeOnlineColumn" Header="Time Online" Width="SizeToHeader">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <DatePicker SelectedDate="{Binding TimeOnline, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTextColumn x:Name="xSizeColumn" Binding="{Binding XSize}" Header="XSize" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="ySizeColumn" Binding="{Binding YSize}" Header="YSize" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="zSizeColumn" Binding="{Binding ZSize}" Header="ZSize" Width="SizeToHeader"/>
        </DataGrid.Columns>
    </DataGrid>

</Grid>

这显示了为每个组件选择的正确程序员（姓名），但是我不知道在展开组合框时如何显示其他程序员。我试过像这样绑定项目源：

                <DataGridTemplateColumn x:Name="programmerColumn" Header="Programmer" Width="SizeToHeader">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <ComboBox ItemsSource="{Binding Path=Programmers, Mode=TwoWay}" DisplayMemberPath="Name">
                            <ComboBoxItem Content="{Binding Programmer.Name}" IsSelected="True"/>
                        </ComboBox>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>

但这不起作用。我的模型配置方式有问题吗？看来我不能访问程序员作为一个集合，它只能识别每个组件的一个程序员。

我看了 20 多个类似的帖子，但我不知道我错过了什么，任何方向都会很棒。

Answer 1

首先，您需要为 Programmers collection 创建一个单独的 collection 查看源代码。然后像 Components.

一样填充它

<CollectionViewSource x:Key="programmerViewSource"
                      d:DesignSource="{d:DesignInstance {x:Type l:Programmer}"/>

var componentViewSource = (CollectionViewSource)FindResource("componentViewSource");
var programmerViewSource = (CollectionViewSource)FindResource("programmerViewSource");

context.Components.Load();
context.Programmers.Load();

componentViewSource.Source = context.Components.Local;
programmerViewSource.Source = context.Programmers.Local;

现在，像这样替换您的列定义：

<DataGridComboBoxColumn Header="Programmer"
                        DisplayMemberPath="Name"
                        ItemsSource="{Binding Source={StaticResource programmerViewSource}}"
                        SelectedItemBinding="{Binding Programmer}" />

将外键属性绑定到 DataGrid ViewSource

Binding Foreign Key Properties to DataGrid ViewSource

c#

wpf

binding

entity