XAML中的綁定問題

我正在嘗試構建UserControl，但我無法讓綁定工作。我知道我錯過了一些東西，但我無法弄清楚它是什麼。我沒有得到任何BindingExpressionsXAML中的綁定問題

XAML

<UserControl x:Class="WpfApplication3.NumericUpDown" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:WpfApplication3"> 
<Grid> 
    <StackPanel> 
     <TextBox Text="{Binding NumericUpDownText, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type local:NumericUpDown}}}" LostFocus="PART_NumericUpDown_LostFocus"> 
      <TextBox.Resources> 
       <Style TargetType="TextBox"> 
        <Style.Triggers> 
         <DataTrigger Binding="{Binding AnyNumericErrors, RelativeSource={RelativeSource AncestorType={x:Type local:NumericUpDown}, AncestorLevel=1}}" Value="false"> 
          <Setter Property="Background" Value="Blue" /> 
         </DataTrigger> 
         <DataTrigger Binding="{Binding AnyNumericErrors, RelativeSource={RelativeSource AncestorType={x:Type local:NumericUpDown}, AncestorLevel=1}}" Value="true"> 
          <Setter Property="Background" Value="Red" /> 
          <Setter Property="ToolTip" Value="There is an error" /> 
         </DataTrigger> 
        </Style.Triggers> 

        <EventSetter Event="LostFocus" Handler="PART_NumericUpDown_LostFocus" /> 
       </Style> 
      </TextBox.Resources> 
      <TextBox.Template> 
       <ControlTemplate> 
        <Border Background="{TemplateBinding Background}" 
           BorderBrush="{TemplateBinding BorderBrush}" 
           BorderThickness="{TemplateBinding BorderThickness}"> 
         <Grid> 
          <Grid.ColumnDefinitions> 
           <ColumnDefinition Width="*" /> 
           <ColumnDefinition Width="Auto" /> 
          </Grid.ColumnDefinitions> 

          <ScrollViewer x:Name="PART_ContentHost" 
               Grid.Column="0" /> 

          <Grid Grid.Column="1"> 
           <Grid.RowDefinitions> 
            <RowDefinition Height="*" /> 
            <RowDefinition Height="*" /> 
           </Grid.RowDefinitions> 

           <RepeatButton x:Name="PART_IncreaseButton" 
               Click="PART_IncreaseButton_Click" 
               Content="UP" /> 
           <RepeatButton x:Name="PART_DecreaseButton" 
               Grid.Row="1" 
               Click="PART_DecreaseButton_Click" 
               Content="Down"/> 
          </Grid> 
         </Grid> 
        </Border> 
       </ControlTemplate> 
      </TextBox.Template> 
     </TextBox> 
    </StackPanel> 
</Grid>

C＃代碼隱藏

namespace WpfApplication3 
{ 
    /// <summary> 
    /// Interaction logic for NumericUpDown.xaml 
    /// </summary> 
    public partial class NumericUpDown : UserControl 
    { 
    public NumericUpDown() 
    { 
     InitializeComponent(); 
     //AnyNumericErrors = true; 
    } 

    private String _NumericUpDownText; 
    public String NumericUpDownText 
    { 
     get { return _NumericUpDownText; } 
     set 
     { 
      _NumericUpDownText = value; 
      NotifyPropertyChanged("NumericUpDownText"); 
     } 
    } 

    public event PropertyChangedEventHandler PropertyChanged; 
    protected void NotifyPropertyChanged(String propertyName) 
    { 
     if (PropertyChanged != null) 
      PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
    } 

    private void PART_NumericUpDown_LostFocus(object sender, RoutedEventArgs e) 
    { 
     CheckForErrors(); 
    } 

    public void CheckForErrors() 
    { 
     try 
     { 
      int value = Int32.Parse(NumericUpDownText); 
      AnyNumericErrors = false; 
     } 
     catch (FormatException) 
     { 
      Debug.WriteLine("error"); 
      AnyNumericErrors = true; 
     } 
    } 

    private Boolean m_AnyNumericErrors; 
    public Boolean AnyNumericErrors 
    { 
     get 
     { 
      return m_AnyNumericErrors; 
     } 
     set 
     { 
      m_AnyNumericErrors = value; 
      NotifyPropertyChanged("AnyNumericErrors"); 
     } 
    } 

    #region DP 

    public Int32 LowerBound 
    { 
     get; 
     set; 
    } 

    public static readonly DependencyProperty LowerBoundProperty = DependencyProperty.Register("LowerBound", typeof(Int32), typeof(NumericUpDown)); 

    #endregion 

    private void PART_IncreaseButton_Click(object sender, RoutedEventArgs e) 
    { 
     try 
     { 
      Int32 value = Int32.Parse(NumericUpDownText); 
      value++; 
      NumericUpDownText = value.ToString(); 
     } 
     catch (Exception) 
     { 
      AnyNumericErrors = true; 
     } 
    } 

    private void PART_DecreaseButton_Click(object sender, RoutedEventArgs e) 
    { 
     try 
     { 
      Int32 value = Int32.Parse(NumericUpDownText); 
      value--; 
      NumericUpDownText = value.ToString(); 
     } 
     catch (Exception) 
     { 
      AnyNumericErrors = true; 
     } 
    } 
} 
}

編輯

的主要問題是，DataTriggers不工作...在開始時，文本框是藍色的，但從未改變。當我按下向上/向下遞增/遞減值，該事件獲取調用，但該值未在UI改變

來源

2012-10-18 Nerd in Training

我試着將DataContext設置爲這個，但它仍然沒有工作 –

使用'PresentationTraceSources'http://msdn.microsoft.com/en-us/library/system.diagnostics.presentationtracesources.aspx來調試你的綁定。 – RredCat

在觸發器中更改背景（如FontSize）以外的任何內容，並查看它是否仍未響應。 – Bijan

你應該使用像DependencyProperties：

public bool AnyNumericErrors 
{ 
    get { return (bool)GetValue(AnyNumericErrorsProperty); } 
    set { SetValue(AnyNumericErrorsProperty, value); } 
} 

// Using a DependencyProperty as the backing store for AnyNumericErrors. This enables animation, styling, binding, etc... 
public static readonly DependencyProperty AnyNumericErrorsProperty = 
    DependencyProperty.Register("AnyNumericErrors", typeof(bool), typeof(NumericUpDown), new UIPropertyMetadata(false));

如果是不夠的，然後刪除你祖先搜索的級別限制。

來源

2012-10-18 14:42:15

感謝您的支持！肯定爲我工作 –

XAML中的綁定問題

回答

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