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c# - MVVM Light RaisePropertyChanged

转载 作者:行者123 更新时间:2023-12-03 10:38:03 31 4
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由于某种原因,我无法让 UI 响应 RaisePropertyChanged。卡住了。
CurrentClient 是不向 UI 触发的部分。真的很奇怪。
希望有人可以帮助我。谢谢斯科特

public class ClientViewModel : ViewModelBase
{
public RelayCommand<ClientDetail> SelectedClient { get; private set; }
public ICollectionView ClientView { get; private set; }

private readonly IClients _clientsService;
public ClientViewModel(IClients clientsService)
{
_clientsService = clientsService;
SelectedClient = new RelayCommand<ClientDetail>(InSelectedClient);
ClientDetailsList = new ObservableCollection<ClientDetail>(_clientsService.LoadClientList());
//CurrentClient = ClientDetailsList.ToList().FirstOrDefault();
ClientView = CollectionViewSource.GetDefaultView(ClientDetailsList);
}

private void InSelectedClient(ClientDetail obj)
{
CurrentClient = obj as ClientDetail;

}

private ObservableCollection<ClientDetail> _clientDetailsList;
public ObservableCollection<ClientDetail> ClientDetailsList
{
get { return _clientDetailsList; }
set { _clientDetailsList = value;
RaisePropertyChanged("ClientDetailsList"); }
}

private ClientDetail _currentClient;
public ClientDetail CurrentClient
{
get { return _currentClient; }

set
{
if (_currentClient == value)
{ return; }

_currentClient = value;
RaisePropertyChanged("CurrentClient");
}
}
}

我的 XAML:
<ListBox Name="lbClientList"
ItemsSource="{Binding ClientView}" ItemTemplate="{DynamicResource DTClientList}"
Background="{x:Null}" BorderThickness="0,0,1,0" BorderBrush="#FF434343" >
<ListBox.Resources>
<DataTemplate x:Key="DTClientList">
<StackPanel Orientation="Horizontal">
<TextBlock TextWrapping="Wrap" Text="{Binding CM_CompanyID}" Margin="0,0,5,0" Width="25" Foreground="#FF3590FC"/>
<TextBlock TextWrapping="Wrap" Text="{Binding CM_CompanyName}" Width="150" Foreground="#FF3590FC"/>
<TextBlock TextWrapping="Wrap" Text="{Binding CM_MainContact}" Width="100" Foreground="#FF3590FC"/>
</StackPanel>
</DataTemplate>
</ListBox.Resources>
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<Command:EventToCommand Command="{Binding SelectedClient, Mode=OneWay}" CommandParameter="{Binding SelectedItem, ElementName=lbClientList}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
<ListBox.DataContext>
<Binding Path="ClientView" Source="{StaticResource ServiceLocator}" UpdateSourceTrigger="PropertyChanged"/>
</ListBox.DataContext>
</ListBox>

在调试中,代码正在点击 RaiseProertyChange 但我在我的 UI 上什么也看不到
<TextBox Text="{Binding CurrentClient.CM_Address1}" TextWrapping="Wrap" VerticalAlignment="Center" Width="210" Background="{DynamicResource MainBackgrouund}" BorderThickness="0,0,0,1" >

最佳答案

好的,不太确定您的代码结构,因为我无法使用当前信息重现您的问题。

然而,有几件事可能值得你知道,

  • InSelectedClient(...)参数已经是 ClientDetail 类型制作as在函数内部强制转换冗余。
  • 接下来你为什么还要使用EventToCommand为了这?你持有ListBox通过 EventToCommand 选择项目在 CurrentClient .而是直接绑定(bind)它。

  • 就像是:
    <ListBox ...
    SelectedItem="{Binding CurrentClient}">
    ...
  • 最后,如果您在虚拟机中没有任何与 CurrentClient 相关的特定逻辑如果真的没有必要坚持下去,那么你可以通过绑定(bind)你的TextBox来摆脱它。直接到ListBox .

  • 就像是
    <TextBox Text="{Binding ElementName=lbClientList, Path=SelectedItem.CM_Address1}" />

    我猜 CM_Address1ClientDetail 中的“属性”类(class)

    现在所有这些方法对我来说都很好。如果这些都不适合您,我建议将一个可重现的独立示例放在一起。如果您愿意,我可以在演示中附上这些方法的示例(不确定如果您的代码结构不同,这会有多大帮助)

    关于c# - MVVM Light RaisePropertyChanged,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17142792/

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