问题摘要
当使用 2 个级联组合框时，子组合框不会选择当前项目，而是选择一个空项目（我不知道它来自哪里！）。
问题详情
我在 xaml 中声明了两个组合框，如下所示。发挥作用的两个实体是StandardRack和RelayConfig
XAML：
<ComboBox ItemsSource="{Binding StandardRacks}" DisplayMemberPath="Name"
SelectedItem="{Binding StandardRack, Mode=TwoWay}" SelectedValuePath="Id"
<ComboBox ItemsSource="{Binding RelayConfigs}" DisplayMemberPath="DisplayName"
SelectedValue="{Binding DefaultRelayConfig, Mode=TwoWay}" SelectedValuePath="Id"
这是支持属性，以及在 ViewModel 中加载组合框的代码
视图模型
private ObservableCollection<StandardRack> _standardRacks;
public ObservableCollection<StandardRack> StandardRacks {
get { return _standardRacks; }
set { _standardRacks = value; RaisePropertyChanged(() => StandardRacks); }
}
private StandardRack _standardRack;
public StandardRack StandardRack {
get { return _standardRack; }
set {
if (_standardRack != value) {
_standardRack = value;
LoadRelayConfigs();
RaisePropertyChanged(() => StandardRack);
}
}
}
private ObservableCollection<RelayConfig> _relayConfigs;
public ObservableCollection<RelayConfig> RelayConfigs {
get { return _relayConfigs; }
set { _relayConfigs = value; RaisePropertyChanged(() => RelayConfigs); }
}
private RelayConfig _defaultRelayConfig;
public RelayConfig DefaultRelayConfig {
get { return _defaultRelayConfig; }
set { _defaultRelayConfig = value; RaisePropertyChanged(() => DefaultRelayConfig); }
}
private void LoadRack() {
StandardRacks = new ObservableCollection<StandardRack>(
unitOfWork.StandardRackRepository.GetQueryable().Include(sr => sr.StandardRelay).ToList());
if (StandardRacks.Count > 0) {
StandardRack = Rack.StandardRack; //Set the current value of StandardRacks combobox
}
}
//Loads RelayConfigs Combobox based on Current Value of StandardRacks Combobox
private void LoadRelayConfigs() {
RelayConfigs = new ObservableCollection<RelayConfig>(
unitOfWork.RelayConfigRepository.GetQueryable()
.Where(rc => rc.StandardRelays.Any(srl => srl.Id == StandardRack.StandardRelay.Id)).ToList());
DefaultRelayConfig = Rack.DefaultRelayConfig; //Set Current Value of RelayConfigs Combobox. Does not work.
}
上面的代码正确加载了两个组合框（StandardRacks 和 RelayConfigs）项。但是，RelayConfigs 选择的值未设置为它从 XAML 指向的值。相反，我在 RelayConfigs 组合框中得到一个空项目作为当前项目。