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我已经看到这个请求略有不同 - 但我很难让它适合我的情况。我有一个应用程序，用户选择组合框将驱动一个事件。这甚至从数据库中获取数据，我想将该数据绑定到 UI。我以为我的绑定设置正确，但我什么也做不了。我可以看到我的所有代码计算都正确触发，但我没有看到任何关于绑定的反馈。我对 WPF 还很陌生，并且仍在努力解决它（我来自 MVC 网络世界），因此非常感谢任何指针。谢谢。

MainWindow 后面的代码：

public MainWindow()
{
    InitializeComponent();
    DataContext = new MainWindowViewModel();
}

private void cboAllClients_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    MainWindowViewModel vm = DataContext as MainWindowViewModel;
    listClient selectedClient = e.AddedItems[0] as listClient;
    Credit.Calc c = new Credit.Calc();
    c.CalcCredit(selectedClient.ClientName);
    vm.FFCredits = c.FundFamilyCredits;
    vm.FundCredits = c.FundCredits;
    DataContext = vm;
}

主窗口 xaml（缩写为绑定问题）

<ListBox x:Name="lbFundFamily" Width="auto" Height="auto"
         Background="Transparent" BorderThickness="0">
    <ListBox.DataContext>
        <Binding Source="FFCredits"></Binding>
    </ListBox.DataContext>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="20"></RowDefinition>
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="auto"></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <TextBlock Text="{Binding Path=FundFamilyName}"
                           Grid.Row="0" Grid.Column="0"
                           Background="White" FontSize="14" Foreground="Black">
                </TextBlock>
                <!--<Rectangle Width="{Binding Path=BrokerCreditList.Utilization}"
                               Height="20" Grid.Row="0" Grid.Column="1"></Rectangle>-->
                <!--<TextBlock Text="{Binding Path=BrokerCreditList.}"></TextBlock>-->
            </Grid>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>


主窗口视图模型：

class MainWindowViewModel : BaseViewModel
{
    public List<listClient> AllClients { get; set; }
    public ObservableCollection<FundFamilySum> FFCredits { get; set; }
    public ObservableCollection<FundSum> FundCredits { get; set; }

    public MainWindowViewModel()
    {
        using (AgencyModelEntities db = new AgencyModelEntities())
        {
            AllClients = db.listClients.ToList();
            FFCredits = new ObservableCollection<FundFamilySum>();
            FundCredits = new ObservableCollection<FundSum>();
        }
    }
}
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1 回答 1

2

最初加载视图时，ListBox绑定到vm.FFCredits哪个new ObservableCollection<FundFamilySum>();

但视图不知道 FFCredits 已更改，除非引发 PropertyChanged 通知，因此它仍然绑定到new ObservableCollection<FundFamilySum>();.

我认为您期望在您再次设置时会收到更改DataContext = vm。但这不会vm像DataContext.

于 2013-05-14T17:39:49.100 回答