ComboBox文本未绑定到DataGrid SelectedItem

Question

我希望ComboBox的Text属性根据DataGrid的SelectedItem进行更改。 我已经在代码隐藏和XAML进行了尝试，并且做到了这一点；

<ComboBox Grid.Row="6" Grid.Column="1" x:Name="contactEmployeeComboBox" Text="{Binding SelectedItem.EmployeeName, ElementName=contactsDataGrid, Mode=OneWay}" Margin="5">

但是，当我从DataGrid选择另一个项目时， Text仍然不会更改。 如何正确绑定ComboBox ？

编辑： DataGrid

private void FillContactsDataGrid()
{
    var selectedCompany = dataGrid.SelectedItem as CompanyModel;
    var Contacts = new ObservableCollection<ContactsModel>();
    var waitWindow = new PleaseWait();

    var ContactTypes = new ObservableCollection<TypeOfContact>();
    var contactService = new ContactsDataService();
    ContactTypes = contactService.GetContactTypesDBF();

    cancelAddContactButton.Visibility = Visibility.Collapsed;
    cancelUpdateContactButton.Visibility = Visibility.Collapsed;

    var contactsDataService = new ContactsDataService();
    Contacts = contactsDataService.HandleContactSelect(companyID);           
    ContactsICollectionView = CollectionViewSource.GetDefaultView(Contacts);
    contactsDataGrid.ItemsSource = ContactsICollectionView;

    //Contacts = await ReturnContacts(Convert.ToInt32(selectedCompany.ID)); removed as tabs were jumping back to companies
}

Answer 1

Binding.Mode属性-获取或设置一个值，该值指示绑定中数据流的方向。

尝试像这样设置为TwoWay ：

<ComboBox Text="{Binding SelectedItem.EmployeeName, ElementName=contactsDataGrid, Mode=TwoWay}"/>

正如MSDN所说：

双向。 导致对源属性或目标属性的更改以自动更新另一个。 这种类型的绑定适用于可编辑表单或其他完全交互的UI方案。

更新：

YourModel：

public class YourModel
{
    public string TitleField { get; set; }    
}

代码背后：

    public MainWindow()
    {
        InitializeComponent();
        FillDataGrid();
    }

    private void FillDataGrid()
    {
        ObservableCollection<YourModel> coll = new ObservableCollection<YourModel>();
        for (int start = 0; start < 10; start++)
        {
            coll.Add(new YourModel(){TitleField="Title " +  
            start.ToString());                                
        }
        dataGrid.ItemsSource = coll;
        comboBox.DisplayMemberPath = "TitleField";
        comboBox.ItemsSource = coll;
    }


    private void dataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {            
        var dataGrid = e.Source as DataGrid;
        var currentIndex = dataGrid.Items.IndexOf(dataGrid.CurrentItem);            
        comboBox.SelectedIndex= currentIndex;
    }

您的XAML：

<StackPanel>
   <DataGrid Name="dataGrid" SelectionChanged="dataGrid_SelectionChanged" />
   <ComboBox  Name="comboBox"/>
</StackPanel>