依赖属性和绑定错误 [英] Dependency Property and Binding Error

问题描述

经过几个小时的搜索，我来找你的帮助：

System.Windows.Data错误：40：BindingExpression路径错误：测试'
属性未找到'对象'

我找不到我的绑定错误的位置...

在我的MainWindow中，我有：

 < Exec：PriceView Price ={Binding Test}/> 
< TextBlock Text ={Binding Test}/> 
  

在我的TextBlock上，带有Test属性的绑定是完美的。

但是对于我的PriceView控件，它不是。

PriceView.xaml

 < StackPanel> 
< TextBlock Text ={Binding Price}FontSize =26FontFamily =Arial/> 
< / StackPanel> 
  

PriceView.xaml.cs

  public partial class PriceView：UserControl 
 {
 public PriceView（）
 {
 this.InitializeComponent（）; 
 this.DataContext = this; 
} 
 
 #region依赖属性
 public static readonly DependencyProperty PriceProperty = DependencyProperty.Register（Price，typeof（float），typeof（PriceView））; 
 
 public float价格
 {
 get {return（float）GetValue（PriceProperty）; } 
 set {SetValue（PriceProperty，value）; } 
} 
 #endregion 
} 
  

我在做什么错了？
这是来自我的依赖关系吗？

解决方案

感谢@HB的发言我找到了答案： / p>

从不在UserControls上设置DataContext

MainWindow.xaml： / em>

 < Exec：PriceView Price ={Binding Test}/> 
< TextBlock Text ={Binding Test}/> 
  

PriceView.xaml：

 < StackPanel x：name =root> 
< TextBlock Text ={Binding Price}FontSize =26FontFamily =Arial/> 
< / StackPanel> 
  

PriceView.xaml.cs：

  this.root.DataContext = this; 
  

After hours of searching, I come for your help :

System.Windows.Data Error: 40 : BindingExpression path error: 'Test' property not found on 'object'

I couldn't found where my binding error was...

In my MainWindow I have :

<Exec:PriceView Price="{Binding Test}"/>
<TextBlock Text="{Binding Test}"/>

On my TextBlock, the Binding with the Test property is perfectly working.

But for my PriceView control, it's not.

PriceView.xaml

<StackPanel>
 <TextBlock Text="{Binding Price}" FontSize="26" FontFamily="Arial"/>
</StackPanel>

PriceView.xaml.cs

public partial class PriceView : UserControl
{
    public PriceView()
    {
        this.InitializeComponent();
        this.DataContext = this;
    }

    #region Dependency Property
    public static readonly DependencyProperty PriceProperty = DependencyProperty.Register("Price", typeof(float), typeof(PriceView));

    public float Price
    {
        get { return (float)GetValue(PriceProperty); }
        set { SetValue(PriceProperty, value); }
    }
    #endregion
}

What am I doing wrong ? Is this coming from my Dependency Properrty ?

解决方案

Thanks to the remark of @H.B I found the answer :

Never set the DataContext on UserControls

MainWindow.xaml :

<Exec:PriceView Price="{Binding Test}"/>
<TextBlock Text="{Binding Test}"/>

PriceView.xaml :

<StackPanel x:name="root"> 
 <TextBlock Text="{Binding Price}" FontSize="26" FontFamily="Arial"/> 
</StackPanel> 

PriceView.xaml.cs :

this.root.DataContext = this;

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