我已经查看了不同问题的答案，但是没有成功将这些答案中的内容映射到我试图解决的问题上。我已经将它简化为以下代码（代表我试图实现的结果），基本上想要在行未被编辑时呈现Person.TitleId对应的Title.TitleText，并正确地绑定下拉列表，使其在下拉列表中显示TitleText并在更改选项时将相关的TitleId写回Person记录。
简而言之，在我的<DataGridComboBoxColumn>中放置什么来实现这一点？
App.xaml.cs
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
var viewModel = new ViewModels.MainWindowViewModel();
var mainWindow = new MainWindow();
mainWindow.DataContext = viewModel;
mainWindow.ShowDialog();
}
MainWindow.xaml
<Grid>
<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Path=Contacts}">
<DataGrid.Columns>
<DataGridComboBoxColumn Header="Title" SelectedItemBinding="{Binding Person}">
<DataGridComboBoxColumn.ElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.Titles}"/>
<Setter Property="IsReadOnly" Value="True"/>
</Style>
</DataGridComboBoxColumn.ElementStyle>
<DataGridComboBoxColumn.EditingElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.Titles}"/>
<Setter Property="DisplayMemberPath" Value="TitleText" />
</Style>
</DataGridComboBoxColumn.EditingElementStyle>
</DataGridComboBoxColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
Person.cs
public class Person
{
public int TitleId { get; set; }
public string LastName { get; set; }
public string FirstName { get; set; }
}
Title.cs
public struct Title
{
public Title(int titleId, string titleText)
: this()
{
TitleId = titleId;
TitleText = titleText;
}
public string TitleText { get; private set; }
public int TitleId { get; private set; }
public static List<Title> GetAvailableTitles()
{
var titles = new List<Title>();
titles.Add(new Title(1, "Mr"));
titles.Add(new Title(2, "Miss"));
titles.Add(new Title(3, "Mrs"));
return titles;
}
}
MainWindowViewModel.cs
public class MainWindowViewModel : ViewModelBase
{
private ObservableCollection<Person> contacts;
private List<Title> titles;
public MainWindowViewModel()
{
titles = Title.GetAvailableTitles();
Contacts = new ObservableCollection<Person>();
Contacts.Add(new Person() { FirstName = "Jane", LastName = "Smith", TitleId = 2 });
}
public List<Title> Titles
{
get { return titles; }
}
public ObservableCollection<Person> Contacts
{
get { return contacts; }
set
{
if (contacts != value)
{
contacts = value;
this.OnPropertyChanged("Contacts");
}
}
}
}
ViewModelBase.cs
public class ViewModelBase : INotifyPropertyChanged
{
protected void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
public event PropertyChangedEventHandler PropertyChanged;
}
Dictionary<int, string>，但我不想这样做，因为这会增加代码量），以查看是否可以自己解决问题，而不涉及任何额外的问题，如数据库访问。鉴于最小化案例是在stackoverflow上发布的最佳案例，这就是我所做的 =) - Rob