如何在ViewModel.AddNewMovie()中获取所选语言的ID？
这是我的第一次尝试。不好，因为它是索引，而不是ID。
View :
...
<ComboBox ItemsSource="{Binding LanguagesCollection}"
SelectedIndex="{Binding NewMovieLanguage}"
DisplayMemberPath="L_Name" SelectedValuePath="L_Id"/>
...
ViewModel:
...
public ObservableCollection<Languages> LanguagesCollection { get; private set; }
public ObservableCollection<Movies> MoviesCollection{ get; private set; }
...
_Entities = new MyAppEntities();
LanguagesCollection = new ObservableCollection<Languages>(_Entities.Languages);
MoviesCollection = new ObservableCollection<Movies>(_Entities.Movies.Include("Languages"));
...
private void AddNewMovie()
{
OnPropertyChanged("NewMovieTitle");
OnPropertyChanged("NewMovieLanguage");
try
{
Movies NewMovie = new Movies
{
M_Title = NewMovieTitle,
M_Language_Id = Convert.ToInt32(NewMovieLanguage)+1,
};
_Entities.AddToMovies(NewMovie);
MoviesCollection.Add(NewMovie);
...
}
catch
{
...
}
}
实体数据模型:
电影(表格)
M_Id Int32
M_标题字符串
M_Language_Id Int32 fk
语言(表)
L_Id Int32
L_Name字符串
-数据-
语言
1英文
2德语
3法语
4西类牙语
最佳答案
哦，解决方法是:
<ComboBox ItemsSource="{Binding LanguagesCollection}"
SelectedValue="{Binding NewMovieLanguage}"
DisplayMemberPath="L_Name" SelectedValuePath="L_Id"/>
关于wpf - ComboBox和 Entity Framework ，如何获取ID？ (WPF-MVVM)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14091333/