Question

将数据绑定到组合框时，需要设置3个项目：

<ComboBox  ItemsSource="{Binding MyList}" SelectedItem="{Binding MyItem}"  DisplayMemberPath="MyName"   />

Say ItemSource是国家/地区列表

我首先将itemsource设置为right source，没关系。然后我将selectedItem设置为特定的Country对象，但它不起作用。

看起来在设置ItemSource时都需要设置。

如何解决此问题？

Answer 1

使用工作代码更新

确保在SelectedItem上启用双向绑定。

<ComboBox ItemsSource="{Binding Path=Countries, Mode=OneWay}" SelectedItem="{Binding Path=SelectedCountry, Mode=TwoWay}" Height="23" HorizontalAlignment="Left" Margin="12,28,0,0" Name="comboBox1" VerticalAlignment="Top" Width="267" />

以下是您的上下文：

public partial class MainPage : UserControl, INotifyPropertyChanged
{
    public MainPage() 
    { 
        InitializeComponent();
        this.Countries = new ObservableCollection<string> { "USA", "CAN" };
        this.DataContext = this;
    }

    public event PropertyChangedEventHandler PropertyChanged;
    public ObservableCollection<string> Countries { get; set; }

    private string _selectedCountry = null;
    public string SelectedCountry
    {
        get { return _selectedCountry; }
        set
        {
            _selectedCountry = value;
            if( this.PropertyChanged != null )
                this.PropertyChanged( this, new PropertyChangedEventArgs( "SelectedCountry" ) );
        }
    }

    private void button1_Click( object sender, RoutedEventArgs e )
    {
        MessageBox.Show( "Selected Country: " + this.SelectedCountry );
    }

}

ComboBox的数据绑定问题

1 个答案: