绑定到 WPF DataGrid 时，此视图不允许 DataGrid 版本“EditItem"

问题描述

我已经阅读了至少 4 个小时，似乎是列表类型，但我有一个情况:

I've been reading about this at least for 4 hours, and seems to be the list type, but I have a situation:

具有集合属性的 ObservableCollection.

A ObservableCollection that has a collection property.

我定义了第一个DataGrid，并在部分

I define the first DataGrid, and in the section

<DataGrid.RowDetailsTemplate>
    <DataTemplate>
        <!-- second Datagrid here, binding to Level2 property of my Observable collection -->
    </DataTemplate>
<DataGrid.RowDetailsTemplate>

一切顺利，屏幕上的一切都如我所料......但是:

Everything goes fine, all things on screen as I expected... but:

1. 如果尝试修改 DataGrid1 单元格，它允许我.
2. 如果尝试修改 DataGrid2 单元格，它会向我抛出此异常 'EditItem' is not allowed for this view

我错过了什么?

这是我的模型:

public partial class Level1
{
    public Level1()
    {
        this.Level2 = new HashSet<Level2>();
    }

    public decimal IdLevel1 { get; set; }
    public decimal IdLevel2 { get; set; }
    public string StrDescripcionTipoAsociado {get;set;}

    public virtual Level2 Level2{ get; set; }
}

public partial class Level2
{
    public decimal IdLevel1 { get; set; }
    public decimal IdLevel3 { get; set; }

    public virtual Level3 Level3{ get; set; }
}

public partial class Level3
{
    public decimal IdLevel3 { get; set; }
    public decimal NumIdConcepto {get;set;}
    public string StrDescripcionConcepto {get;set;}
}

XAML 代码:

    <DataGrid Grid.Row="1"
              ItemsSource="{Binding Level1}"
              AutoGenerateColumns="False"
              SelectionMode="Single"
              GridLinesVisibility="Vertical"
              CanUserAddRows="True"
              CanUserDeleteRows="True"
              x:Name="GridTipoAsociado">
        <DataGrid.Columns>
            <DataGridTemplateColumn Header="Tipo de asociado" x:Name="TipoUsuarioSeleccionado">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <Label Style="{StaticResource ResourceKey=FontElemNivel1}" Content="{Binding StrDescripcionTipoAsociado}"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
                <DataGridTemplateColumn.CellEditingTemplate>
                    <DataTemplate>
                        <TextBox Style="{StaticResource ResourceKey=FontElemNivel2}" Text="{Binding StrDescripcionTipoAsociado }"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellEditingTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
        <DataGrid.RowDetailsTemplate>
            <DataTemplate>
                <DataGrid Grid.Row="1"
                          ItemsSource="{Binding Level2}"
                          AutoGenerateColumns="False"
                          SelectionMode="Single"
                          SelectionUnit="Cell"
                          GridLinesVisibility="Vertical"
                          CanUserAddRows="True"
                          CanUserDeleteRows="True"
                          x:Name="GridItems">
                    <DataGrid.Columns>
                        <DataGridTemplateColumn Header="Id Item">
                            <DataGridTemplateColumn.CellTemplate>
                                <DataTemplate>
                                    <Label Content="{Binding NumIdConcepto}"/>
                                </DataTemplate>
                            </DataGridTemplateColumn.CellTemplate>
                        </DataGridTemplateColumn>
                        <DataGridTemplateColumn Header="Items">
                            <DataGridTemplateColumn.CellTemplate>
                                <DataTemplate>
                                    <Label Content="{Binding Level3.StrDescripcionConcepto}"/>
                                </DataTemplate>
                            </DataGridTemplateColumn.CellTemplate>
                            <DataGridTemplateColumn.CellEditingTemplate>
                                <DataTemplate>
                                    <TextBox Text="{Binding Level3.StrDescripcionConcepto}"/>
                                </DataTemplate>
                            </DataGridTemplateColumn.CellEditingTemplate>
                        </DataGridTemplateColumn>
                    </DataGrid.Columns>
                </DataGrid>
            </DataTemplate>
        </DataGrid.RowDetailsTemplate>
    </DataGrid>

推荐答案

感谢@nit 给我正确的道路.当然问题在于EF集合的基本类型

Tks to @nit who give me the right path. Of course the problem reside on the base Type of EF collections

哈希 和Datagrid 至少需要一个List，把我所有的类都改成那些由实体框架生成的"，又给我带来了一个问题，必须手动修改，我有很多.

Hashet< T > And Datagrid need at least a List< T >, changing all my classes "those generated by Entity framework", give to me another problem, must make changes manually, and I have a lot of them.

我的解决方案是创建一个转换器，这对我来说很脏:

My solution was to create a converter, that made the dirty work for me:

public class listToObservableCollection : BaseConverter, IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        HashSet<Level2> observableList = (HashSet<Level2>)value;
        return new ObservableCollection<Level2>(observableList);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return (HashSet<Level2>)value;
    }
}

public abstract class BaseConverter : MarkupExtension
{
    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        return this;
    }
}

并将其放在我的 Datagrid2 的绑定上:

And put it on the binding of my Datagrid2:

<!--part of my window definition--!>
xmlns:l="clr-namespace:Recursos;assembly=Recursos"
...
<!--part of my resources section--!>
<l:listToObservableCollection x:Key="listoToObservable"/>
...
<!--part of my datagrid definition--!>
ItemsSource="{Binding Level2,Converter={StaticResource listoToObservable}}"

唯一在播的是如何制作通用转换器，但目前它工作正常.

The only thing on the air is how to make a generic converter, but for now it works fine.

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