WPF绑定两级UserControl

让我们来解释一下我的问题，我写了一个应用程序的代码，显示一个用户控件绑定，我试图设置为另一个子用户控件。我正在使用我设置为MainWindow.xaml的模型。WPF绑定两级UserControl

的问题是：

innerusercontrol没有显示在绑定变化的用户控件。我想我犯了一个错误，但我不知道在哪里以及如何解决它。我阅读了几篇文章，但没有一篇正文用特定的代码行回答。任何机构能帮助我吗？

我会很感激的答案。由于

MainWindow.xaml

<Window x:Class="DependencyProperties.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:local="clr-namespace:DependencyProperties" 
     Title="MainWindow" Height="350" Width="525"> 
    <Grid> 
     <Grid.ColumnDefinitions> 
      <ColumnDefinition/> 
     </Grid.ColumnDefinitions> 
     <Grid.RowDefinitions> 
      <RowDefinition/> 
      <RowDefinition Height="3*"/> 
      <RowDefinition/> 
     </Grid.RowDefinitions> 
     <local:DisplayProduct x:Name="ucDisplay" Grid.Row="1" Height="110"/> 
     <Button Grid.Row="2" Click="Button_Click">Apply circle visibility false/true</Button> 
    </Grid> 
</Window>

MainWindow.xaml.cs

public partial class MainWindow : Window 
    { 
     public static ProductModel product; 
     public MainWindow() 
     { 
      InitializeComponent(); 
      product = new ProductModel() { IsActivo = true, Descuento = 15.00, Importe = 100.00, Total = 85.00 }; 
      ucDisplay.DataContext = product; 
     } 

     private void Button_Click(object sender, RoutedEventArgs e) 
     { 
      Console.WriteLine("Antes " + product.IsActivo); 
      product.IsActivo = !product.IsActivo; 
      Console.WriteLine("Despues" + product.IsActivo); 
     } 
    }

DisplayProductUserControl.xaml

<UserControl x:Class="DependencyProperties.DisplayProductUserControl" 
      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:DependencyProperties" 
      mc:Ignorable="d" x:Name="win_Display" 
      d:DesignHeight="80" d:DesignWidth="500"> 
    <UserControl.Resources> 
     <Style TargetType="TextBlock"> 
      <Setter Property="FontSize" Value="18"/> 
      <Setter Property="FontWeight" Value="Light"/> 
     </Style> 
    </UserControl.Resources> 
    <Grid> 
     <Viewbox> 
      <Grid Width="{Binding ElementName=win_Display, Path=ActualWidth}" Height="{Binding ElementName=win_Display, Path=ActualHeight}"> 
       <Grid.ColumnDefinitions> 
        <ColumnDefinition /> 
        <ColumnDefinition /> 
        <ColumnDefinition /> 
       </Grid.ColumnDefinitions> 
       <Grid.RowDefinitions> 
        <RowDefinition /> 
        <RowDefinition /> 
       </Grid.RowDefinitions> 
       <StackPanel Orientation="Horizontal"> 
        <TextBlock Text="Price: "/> 
        <TextBlock Text="$"/> 
        <TextBlock Text="{Binding Path=Price}"/> 
       </StackPanel> 
       <StackPanel Grid.Column="1" Orientation="Horizontal"> 
        <TextBlock Text="Discount: "/> 
        <TextBlock Text="$"/> 
        <TextBlock Text="{Binding Path=Discount}"/> 
       </StackPanel> 
       <StackPanel Grid.Column="2" Orientation="Horizontal"> 
        <TextBlock Text="Total: "/> 
        <TextBlock Text="$"/> 
        <TextBlock Text="{Binding Path=Total}"/> 
       </StackPanel> 
       <local:InnerUserControl Grid.Column="0" Grid.Row="1"> 
        <local:InnerUserControl DataContext="{Binding Path=IsActive,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=UserControl}}"/> 
       </local:InnerUserControl> 
      </Grid> 
     </Viewbox> 
    </Grid> 
</UserControl>

InnerUserControl*问题是该处< ------------------ *

<UserControl x:Class="DependencyProperties.InnerUserControl" 
       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" 
       mc:Ignorable="d" x:Name="win_inner" 
       d:DesignHeight="40" d:DesignWidth="100"> 
     <UserControl.Resources> 
      <BooleanToVisibilityConverter x:Key="VisibilityConverter"/> 
     </UserControl.Resources> 
     <Grid Width="{Binding ElementName=win_inner, Path=ActualWidth}">   
       <TextBlock Text="{Binding Path=IsActive}" FontSize="15"/> 
**<!-- HERE IS THE PROBLEM I DOESN'T SHOW CHANGES WHEN IsActive is false/true -->** 
       <Ellipse Height="{Binding ElementName=win_inner, Path=ActualHeight}" Width="{Binding RelativeSource={RelativeSource Self}, Path=ActualHeight}" Fill="Red" 
         Visibility="{Binding Path=IsActive, Converter={StaticResource VisibilityConverter}}" HorizontalAlignment="Right"></Ellipse> 
     </Grid> 
    </UserControl>

ProductoModel

public class ProductModel : INotifyPropertyChanged 
{ 
    private double price; 

    public double Price 
    { 
     get { return price; } 
     set { price= value; } 
    } 

    private double discount; 

    public double Discount 
    { 
     get { return discount; } 
     set { discount= value; } 
    } 

    private double total; 

    public double Total 
    { 
     get { return total; } 
     set { total = value; } 
    } 

    private bool isActive; 

    public bool IsActive 
    { 
     get { return isActive; } 
     set { isActive = value; } 
    } 


    protected void RaisePropertyChanged(string propertyName) 
    { 
     var handler = PropertyChanged; 

     if (handler != null) 
     { 
      handler(this, new PropertyChangedEventArgs(propertyName)); 
     } 
    } 

    public event PropertyChangedEventHandler PropertyChanged; 
}

来源

2015-09-04 Jez Avila

您将不得不调用IsActive setter中的RaisePropertyChanged – dnr3

像dnr3已评论，

在您的'产品模型'类中添加RaisePropertyChanged方法。

public bool IsActive 
{ 
    get { return isActive; } 
    set 
    { 
     isActive = value; 
     RaisePropertyChanged("IsActive"); 
    } 
}

视图在得到'PropertyChanged'事件之前永不改变。

来源

2015-09-04 08:33:46 JasonRho

WPF绑定两级UserControl

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