WPF數據綁定將不起作用

嗨，我有一個UserControll與DependencyProperty稱爲「Risikobewertung」具有自己的數據類型「RisikoBewertung」（由LINQ創建的數據類型）。所以在我的Controll中，我嘗試將RisikoBewertung的字段綁定到Controll上的TextBoxes，但它不起作用。我希望你能幫助我，並告訴我，爲什麼;）WPF數據綁定將不起作用

代碼： UserControl.xaml：

<UserControl x:Class="Cis.Modules.RiskManagement.Views.Controls.RisikoBewertungEditor" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
xmlns:gridtools="clr-namespace:TmgUnity.Common.Presentation.Controls.DataGridTools;assembly=TmgUnity.Common.Presentation" 
xmlns:converter="clr-namespace:Cis.Modules.RiskManagement.Views.Converter" 
xmlns:tmg="clr-namespace:TmgUnity.Common.Presentation.Controls.FilterDataGrid;assembly=TmgUnity.Common.Presentation" 
xmlns:validators="clr-namespace:TmgUnity.Common.Presentation.ValidationRules;assembly=TmgUnity.Common.Presentation" 
xmlns:toolkit="http://schemas.microsoft.com/wpf/2008/toolkit" 
xmlns:risikoControls="clr-namespace:Cis.Modules.RiskManagement.Views.Controls"> 
<UserControl.Resources> 
    <converter:CountToArrowConverter x:Key="CountConverter" /> 
</UserControl.Resources> 

<Grid> 
    <Grid.ColumnDefinitions> 
     <ColumnDefinition Name="Veränderung"/> 
     <ColumnDefinition Name="Volumen" /> 
     <ColumnDefinition Name="Schadenshöhe" /> 
     <ColumnDefinition Name="SchadensOrte" /> 
     <ColumnDefinition Name="Wahrscheinlichkeit" /> 
     <ColumnDefinition Name="Kategorie" /> 
     <ColumnDefinition Name="Handlungsbedarf" /> 
    </Grid.ColumnDefinitions> 
    <Grid.RowDefinitions> 
     <RowDefinition Height="20" /> 
     <RowDefinition /> 
    </Grid.RowDefinitions> 
    <Image Source="{Binding Path=Entwicklung, Converter={StaticResource CountConverter}, UpdateSourceTrigger=PropertyChanged}" Grid.RowSpan="2" Grid.Row="0" Width="68" Height="68" Grid.Column="0" /> 
    <TextBox Grid.Column="1" Grid.Row="0" Text="Volumen" /> 
    <TextBox Grid.Column="1" Grid.Row="1"> 
     <TextBox.Text> 
      <Binding Path="Volumen" UpdateSourceTrigger="PropertyChanged" /> 
     </TextBox.Text> 
    </TextBox> 
    <TextBox Grid.Column="2" Grid.Row="0" Text="Schadenshöhe" /> 
    <TextBox Grid.Column="2" Grid.Row="1" Text="{Binding Path=Schadenshöhe, UpdateSourceTrigger=PropertyChanged}" /> 
    <StackPanel Grid.Column="3" Grid.RowSpan="2" Grid.Row="0" Orientation="Horizontal"> 
     <Grid> 
      <Grid.RowDefinitions> 
       <RowDefinition Height="20" /> 
       <RowDefinition /> 
      </Grid.RowDefinitions> 
      <Grid.ColumnDefinitions> 
       <ColumnDefinition /> 
       <ColumnDefinition /> 
       <ColumnDefinition /> 
      </Grid.ColumnDefinitions> 
      <TextBox Text ="Politik" Grid.Row="0" Grid.Column="0"/> 
      <CheckBox Name="Politik" Grid.Row="1" Grid.Column="0" IsChecked="{Binding Path=Politik, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Center" HorizontalAlignment="Center" /> 
      <TextBox Text ="Vermögen" Grid.Row="0" Grid.Column="1" /> 
      <CheckBox Name="Vermögen" Grid.Row="1" Grid.Column="1" IsChecked="{Binding Path=Vermögen, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Center" HorizontalAlignment="Center" /> 
      <TextBox Text ="Vertrauen" Grid.Row="0" Grid.Column="2" /> 
      <CheckBox Name="Vertrauen" Grid.Row="1" Grid.Column="2" IsChecked="{Binding Path=Vertrauen, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Center" HorizontalAlignment="Center" /> 
     </Grid> 
    </StackPanel> 
    <TextBox Grid.Column="4" Grid.Row="0" Text="Wahrscheinlichkeit" /> 
    <TextBox Grid.Column="4" Grid.Row="1" Text="{Binding Path=Wahrscheinlichkeit, UpdateSourceTrigger=PropertyChanged}"/> 
    <risikoControls:RiskTrafficLightControl Grid.Column="5" Grid.Row="0" Grid.RowSpan="2" RiskValue="{Binding Path=Kategorie, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /> 
    <StackPanel Grid.Column="6" Grid.RowSpan="2" Grid.Row="0" Orientation="Vertical"> 
     <TextBox Text="Handlungsbedarf" /> 
     <CheckBox VerticalAlignment="Center" HorizontalAlignment="Center" IsChecked="{Binding Path=Handlungsbedarf, UpdateSourceTrigger=PropertyChanged}" /> 

    </StackPanel> 
</Grid>

代碼隱藏：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Data; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Imaging; 
using System.Windows.Navigation; 
using System.Windows.Shapes; 
using System.ComponentModel; 
using Cis.Modules.RiskManagement.Data; 
using Cis.Modules.RiskManagement.Views.Models; 


namespace Cis.Modules.RiskManagement.Views.Controls 
{ 
    /// <summary> 
    /// Interaktionslogik für RisikoBewertungEditor.xaml 
    /// </summary> 
    public partial class RisikoBewertungEditor : UserControl, INotifyPropertyChanged 
    { 


     public event PropertyChangedEventHandler PropertyChanged; 
     public static readonly DependencyProperty RisikoBewertungProperty = DependencyProperty.Register("RisikoBewertung", typeof(RisikoBewertung), typeof(RisikoBewertungEditor), new PropertyMetadata(null, new PropertyChangedCallback(RisikoBewertungChanged))); 
     // public static readonly DependencyProperty Readonly = DependencyProperty.Register("EditorReadonly", typeof(Boolean), typeof(RisikoBewertungEditor), new PropertyMetadata(null, new PropertyChangedCallback(ReadonlyChanged))); 

     private static void RisikoBewertungChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs arguments) 
     { 
      var bewertungEditor = dependencyObject as RisikoBewertungEditor; 
      bewertungEditor.RisikoBewertung = arguments.NewValue as RisikoBewertung; 
     } 
     /* 
      private static void ReadonlyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs arguments) 
      { 
      } 
     */ 
     public RisikoBewertung RisikoBewertung 
     { 
      get 
      { 
       return GetValue(RisikoBewertungProperty) as RisikoBewertung; 
      } 
      set 
      { 
       SetValue(RisikoBewertungProperty, value); 

       if (PropertyChanged != null) 
       { 
        PropertyChanged(this, new PropertyChangedEventArgs("RisikoBewertung")); 
       } 
      } 
     } 
     /* 
      public Boolean EditorReadonly 
      { 
       get; 
       set; 
      } 
      */ 

     public void mebosho(object sender, RoutedEventArgs e) 
     { 
      MessageBox.Show(RisikoBewertung.LfdNr.ToString()); 
     } 

     public RisikoBewertungEditor() 
     { 
      InitializeComponent(); 
      RisikoBewertung = new RisikoBewertung(); 
      this.DataContext = (GetValue(RisikoBewertungProperty) as RisikoBewertung); 
     } 

    } 
}

和一個小例子它的用法：

 <tmg:FilterDataGrid Grid.Row="0" AutoGenerateColumns="False" 
         ItemsSource="{Binding TodoListe}" 
         IsReadOnly="False" x:Name="TodoListeDataGrid" 
         CanUserAddRows="False" SelectionUnit="FullRow" 
         SelectedValuePath="." 
         SelectedValue="{Binding CurrentTodoItem}" 
         gridtools:DataGridStyle.SelectAllButtonTemplate="{DynamicResource CisSelectAllButtonTemplate}" 
         CanUserResizeColumns="True" MinHeight="80" 
         SelectionChanged="SelectionChanged" 
         HorizontalAlignment="Stretch" VerticalAlignment="Stretch" 
         diagnostics:PresentationTraceSources.TraceLevel="High" 
         > 
     <tmg:FilterDataGrid.RowDetailsTemplate> 
      <DataTemplate> 
       <risikoControls:RisikoBewertungEditor x:Name="BewertungEditor" RisikoBewertung="{Binding ElementName=TodoListeDataGrid, Path=SelectedValue}" diagnostics:PresentationTraceSources.TraceLevel="High"> 
       </risikoControls:RisikoBewertungEditor> 
      </DataTemplate> 
     </tmg:FilterDataGrid.RowDetailsTemplate> 

     <tmg:FilterDataGrid.Columns> 
      <toolkit:DataGridTextColumn Binding="{Binding Path=LfdNr}" Header="LfdNr" /> 
     </tmg:FilterDataGrid.Columns> 

    </tmg:FilterDataGrid>

來源

2010-05-31 Tokk

的問題是，你的用戶控件的構造函數中，要創建一個新的對象，並將其設置爲DataContext，以後當你的RisikoBewertung屬性設置爲其他在XAML東西時，DataContext保持設置在其它空目的。你需要做的是將用戶控件的DataContext綁定到RisikoBewertung屬性。就像這樣：

<UserControl ... 
    DataContext=" 
     {Binding RelativeSource={RelativeSource Self}, 
       Path=RisikoBewertung}" 
.../>

，並刪除一切從它的構造除了InitializeComponent();

public RisikoBewertungEditor() 
{ 
    InitializeComponent(); 
}

來源

2010-05-31 18:53:07

我沒有看到你將Grid的ItemsSource設置爲任何東西。

來源

2010-05-31 16:43:25 Robaticus

數據網格工作PERFEKT，我不認爲這就是問題。 – Tokk 2010-05-31 17:37:15

我同意。我也有同樣的錯誤，並在其他MS Windows上沒有錯誤。看起來有些DLL丟失或類似SL4-SL5發生... – 2012-03-23 14:34:05

WPF數據綁定將不起作用

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