这个视图不允许使用“EditItem”功能。WPF .NET 4 / EF 4.1 - 主从结构。

Question

这个视图不允许使用“EditItem”功能。WPF .NET 4 / EF 4.1 - 主从结构。

3

为了试图找到这个问题的答案，我做了一个更简单的项目，使用AdventureWorks数据库。

我从Vendor和PurchaseOrderHeader表中创建了一个模型 - 将它们作为数据源添加到项目中，并有以下代码：

XAML：

<Window x:Class="EFDbContextTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="569" Width="1130" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:my="clr-namespace:EFDbContextTest;assembly=EFDbContextTest" Loaded="Window_Loaded">
<Window.Resources>
    <CollectionViewSource x:Key="vendorViewSource" d:DesignSource="{d:DesignInstance my:Vendor, CreateList=True}" />
    <CollectionViewSource x:Key="vendorPurchaseOrderHeadersViewSource" Source="{Binding Path=PurchaseOrderHeaders, Source={StaticResource vendorViewSource}}" />
</Window.Resources>
<Grid DataContext="{StaticResource vendorViewSource}">
    <DataGrid AutoGenerateColumns="False" EnableRowVirtualization="True" Height="200" HorizontalAlignment="Left" ItemsSource="{Binding}" Margin="12,12,0,0" 
              Name="vendorDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" VerticalAlignment="Top" Width="1084" IsSynchronizedWithCurrentItem="True" 
              SelectedValuePath="VendorID">
        <DataGrid.Columns>
            <DataGridTextColumn x:Name="accountNumberColumn" Binding="{Binding Path=AccountNumber}" Header="Account Number" Width="SizeToHeader" />
            <DataGridCheckBoxColumn x:Name="activeFlagColumn" Binding="{Binding Path=ActiveFlag}" Header="Active Flag" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="creditRatingColumn" Binding="{Binding Path=CreditRating}" Header="Credit Rating" Width="SizeToHeader" />
            <DataGridTemplateColumn x:Name="modifiedDateColumn" Header="Modified Date" Width="SizeToHeader">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <DatePicker SelectedDate="{Binding Path=ModifiedDate, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}" />
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTextColumn x:Name="nameColumn" Binding="{Binding Path=Name}" Header="Name" Width="SizeToHeader" />
            <DataGridCheckBoxColumn x:Name="preferredVendorStatusColumn" Binding="{Binding Path=PreferredVendorStatus}" Header="Preferred Vendor Status" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="purchasingWebServiceURLColumn" Binding="{Binding Path=PurchasingWebServiceURL}" Header="Purchasing Web Service URL" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="vendorIDColumn" Binding="{Binding Path=VendorID}" Header="Vendor ID" Width="SizeToHeader" />
        </DataGrid.Columns>
    </DataGrid>
    <DataGrid AutoGenerateColumns="False" EnableRowVirtualization="True" Height="200" HorizontalAlignment="Left" 
              ItemsSource="{Binding Source={StaticResource vendorPurchaseOrderHeadersViewSource}}" Margin="12,218,0,0" Name="purchaseOrderHeadersDataGrid" 
              RowDetailsVisibilityMode="VisibleWhenSelected" VerticalAlignment="Top" Width="1084" IsSynchronizedWithCurrentItem="True">
        <DataGrid.Columns>
            <DataGridTextColumn x:Name="employeeIDColumn" Binding="{Binding Path=EmployeeID}" Header="Employee ID" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="freightColumn" Binding="{Binding Path=Freight}" Header="Freight" Width="SizeToHeader" />
            <DataGridTemplateColumn x:Name="modifiedDateColumn1" Header="Modified Date" Width="SizeToHeader">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <DatePicker SelectedDate="{Binding Path=ModifiedDate, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}" />
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTemplateColumn x:Name="orderDateColumn" Header="Order Date" Width="SizeToHeader">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <DatePicker SelectedDate="{Binding Path=OrderDate, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}" />
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTextColumn x:Name="purchaseOrderIDColumn" Binding="{Binding Path=PurchaseOrderID}" Header="Purchase Order ID" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="revisionNumberColumn" Binding="{Binding Path=RevisionNumber}" Header="Revision Number" Width="SizeToHeader" />
            <DataGridTemplateColumn x:Name="shipDateColumn" Header="Ship Date" Width="SizeToHeader">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <DatePicker SelectedDate="{Binding Path=ShipDate, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}" />
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTextColumn x:Name="shipMethodIDColumn" Binding="{Binding Path=ShipMethodID}" Header="Ship Method ID" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="statusColumn" Binding="{Binding Path=Status}" Header="Status" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="subTotalColumn" Binding="{Binding Path=SubTotal}" Header="Sub Total" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="taxAmtColumn" Binding="{Binding Path=TaxAmt}" Header="Tax Amt" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="totalDueColumn" Binding="{Binding Path=TotalDue}" Header="Total Due" Width="SizeToHeader" />
            <DataGridTextColumn x:Name="vendorIDColumn1" Binding="{Binding Path=VendorID}" Header="Vendor ID" Width="SizeToHeader" />
        </DataGrid.Columns>
    </DataGrid>
</Grid>

C#：

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;


namespace EFDbContextTest
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        Entities _context = new Entities();

        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            System.Windows.Data.CollectionViewSource vendorViewSource =
                ((System.Windows.Data.CollectionViewSource)(this.FindResource("vendorViewSource")));
        _context.Vendors.Include("PurchaseOrderHeaders").Load();
        vendorViewSource.Source = _context.Vendors.Local;

        }
    }
}

所以，两个网格都在窗口上，您可以像没有明天一样编辑/删除/更新主网格 - 但是一旦您尝试点击详细网格上的任何单元格，您会收到错误消息“不允许此视图进行EditItem操作”。

我必须错过了什么，因为在使用EF 4.1的多个实例中，我都遇到了这种情况 - 求助！

- MikeyVindictive

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Slauma · Accepted Answer

如果你的Vendor类中的PurchaseOrderHeaders集合属性是ICollection<T>类型，则可能是问题的源头。要获得允许编辑的数据网格，源集合必须是IList<T>类型或任何实现IList<T>的类型，如List<T>或ObservableCollection<T>。你可能需要相应地更改模型类中PurchaseOrderHeaders的集合类型。

这里有更详细的解释: Getting Readonly Databind using EF POCO Objects

编辑

根据@Allon Guralnek在下面的评论中所述，为了获得可编辑的DataGrid，需要实现非泛型的IList接口。这适用于ObservableCollection和List。其他仅实现泛型的IList而不实现非泛型的IList的实现将无法使DataGrid可编辑。