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有如下代码：

                              <ComboBox ItemsSource="{Binding Apps}"
                                      SelectedItem="{Binding SelectedApp}"
                                      SelectionChanged="CbxApp_OnSelectionChanged"
                                      Width="120" PlaceholderText="请选择" />
                            <ComboBox ItemsSource="{Binding Envs}"
                                      SelectedItem="{Binding SelectedEnv}" />

VM：

    public IList<String> Apps { get; set; } = new List<string>();
    public IList<String> Envs { get; set; } = new List<String>();

[Reactive] public String SelectedApp { get; set; }
[Reactive] public String SelectedEnv { get; set; }

Codebehind:

    private void CbxApp_OnSelectionChanged(object? sender, SelectionChangedEventArgs e)
    {
        var vm = this.DataContext as HttpInvokeHomeViewModel;
        if (vm == null)
        {
            return;
        }
        
        vm.BindEnv();
    }

问题：

绑定Envs 后，UI层 可以展开下拉，但是无法选中，

解决方案：

给ItemSource 设置为 ObservableCollection<String> 可解

public ObservableCollection<String> Apps { get; set; } = new ObservableCollection<string>();
    public ObservableCollection<String> Envs { get; set; } = new ObservableCollection<String>();