組合框綁定到實體數據庫的DataGrid字段

Question

我想用組合框列創建雙向可編輯數據網格。 此數據網格連接到.NET實體框架。我怎麼能這樣做？你能延長我的代碼嗎？

SQL：

CREATE TABLE Languages(
    L_Id INTEGER PRIMARY KEY IDENTITY(1,1), 
    L_Name VARCHAR(16) NOT NULL 
); 

CREATE TABLE Movies (
    M_Id INTEGER PRIMARY KEY IDENTITY(1,1), 
    M_Title VARCHAR(128) NOT NULL, 
    M_Language_Id INTEGER NOT NULL, 

    CONSTRAINT MoviesToLanguages 
     FOREIGN KEY (M_Language_Id) 
     REFERENCES Languages (L_Id) 
); 

INSERT INTO Languages VALUES('subtitled'); 
INSERT INTO Languages VALUES('synchronized'); 

MainWindow.xaml

... 
<DataGrid Name="MoviesDataGrid" Grid.Row="1" AutoGenerateColumns="False" ItemsSource="{Binding Movies}"> 
    <DataGrid.Columns> 
     <DataGridTextColumn Header="Title" Binding="{Binding M_Title}" /> 
     <DataGridTemplateColumn Header="Language" CanUserReorder="False"> 
      <DataGridTemplateColumn.CellTemplate> 
       <DataTemplate> 
         <TextBlock TextAlignment="Center" Text="{Binding Path=Languages.L_Name}"/> 
       </DataTemplate> 
      </DataGridTemplateColumn.CellTemplate> 
      <DataGridTemplateColumn.CellEditingTemplate> 
       <DataTemplate> 
        ??? 
       </DataTemplate> 
      </DataGridTemplateColumn.CellEditingTemplate> 
     </DataGridTemplateColumn> 
    </DataGrid.Columns> 
</DataGrid> 
... 

CinemaViewModel.cs

private CinemaEntities _Entities; 
public ObservableCollection<Movies> Movies{ get; private set; } 

public CinemaViewModel() 
{ 
    _Entities = new CinemaEntities(); 
    Movies = new ObservableCollection<Movies>(_Entities.Movies.Include("Languages")); 
    OnPropertyChanged("Movies"); 
} 

private void Save() 
{ 
    _Entities.SaveChanges(); 
} 

Answer 1

在你的DataTemplate：

<ComboBox ItemsSource="{Binding DataContext.Movies, RelativeSource={RelativeSource FindAncestor, AncestorType=DataGrid}" SelectedItem="{Binding WhateverPropertyReferencesTheMovieNavigationPropertyInYourEntities}" DisplayMemberPath="WhateverPropertyInTheMoviesYouWantToVisualizeInTheComboBox"/>