Question

我有两个comboxbox，一个有省份列表，另一个应该填充与所选省份相对应的城市。我的问题是，当我改变省份时，城市的combox永远不会被填满。

XML文件：

<ComboBox x:Name="ProvincesCombo" ItemsSource="{StaticResource Provinces}" IsSynchronizedWithCurrentItem="true" > </ComboBox>

<ComboBox x:Name="CitiesCombo" ItemsSource="{Binding SelectedItem.Cities, ElementName=ProvincesCombo}" IsSynchronizedWithCurrentItem="true">
</ComboBox>

代码：

ObservableCollection<Province> Provinces = new ObservableCollection<Province>();
Provinces.Add(new Province() { Name = "أدرار", Cities = new ObservableCollection<string>() { "تيط", "تيمقطن", "أقبلى", "أولف", "تبمياوين", "أوقروت", "أولاد السعيد", "تيميمون" } });
Provinces.Add(new Province() { Name = "الأغواط", Cities = new ObservableCollection<string>() { "الحاج المشري", "عين سيدي علي", "قلتة سيدي سعد", "الأغواط", "الخنق", "الحويطة" } });
DataContext = this;

public class Province
{
    public string Name { get; set; }
    public ObservableCollection<string> Cities { get; set; }
}

Answer 1

我已将第一个组合框的ItemsSource从StaticResource更改为Binding，并将字段Provinces更改为属性，所有内容都按预期工作。

XAML：

<ComboBox x:Name="ProvincesCombo" ItemsSource="{Binding Provinces}" IsSynchronizedWithCurrentItem="true" />
<ComboBox x:Name="CitiesCombo" ItemsSource="{Binding SelectedItem.Cities, ElementName=ProvincesCombo}" IsSynchronizedWithCurrentItem="true" />

代码隐藏：

public MainWindow()
{
    InitializeComponent();
    DataContext = this;
    Provinces.Add(new Province() { Name = "A", Cities = new ObservableCollection<string>() { "City A1", "City A2" } });
    Provinces.Add(new Province() { Name = "B", Cities = new ObservableCollection<string>() { "City B1", "City B2" } });
}

public ObservableCollection<Province> Provinces { get; set; } = new ObservableCollection<Province>();

我还实现了INotifyPropertyChanged接口。

WPF绑定comobox到另一个

1 个答案: