绑定到静态属性 [英] Binding to static property

问题描述

我很难将一个简单的静态字符串属性绑定到一个文本框。

这是具有静态属性的类：

  public class VersionManager 
 {
 private static string filterString; 
 
 public static string FilterString 
 {
 get {return filterString; } 
 set {filterString = value; } 
} 
} 
  

在我的xaml中，我只想绑定静态属性到一个文本框：

 < TextBox> 
< TextBox.Text> 
< Binding Source ={x：Static local：VersionManager.FilterString}/> 
< /TextBox.Text> 
< / TextBox> 
  

所有编译，但在运行时，我收到以下异常：

无法将属性
'Source'中的值转换为
'System.Windows.Markup.StaticExtension'类型的对象。
对象
中的错误
$ b标记文件中的System.Windows.Data.Binding'
'BurnDisk;组件/ selectversionpagefunction.xaml'
行57位置29.

任何想法我在做错什么？

解决方案

如果绑定需要双向，您必须提供路径。对静态属性进行双向绑定有一个窍门，只要该类不是静态的：在资源中声明一个类的虚拟实例，并将其用作绑定的源。

 < Window.Resources> 
< local：VersionManager x：Key =versionManager/> 
< /Window.Resources> 
 ... 
 
< TextBox Text ={Binding Source = {StaticResource versionManager}，Path = FilterString}/> 
  

I'm having a hard time binding a simple static string property to a text box.

Here's the class with the static property:

public class VersionManager
{
    private static string filterString;

    public static string FilterString
    {
        get { return filterString; }
        set { filterString = value; }
    }
}

In my xaml, I just want to bind this static property to a text box:

<TextBox>
    <TextBox.Text>
        <Binding Source="{x:Static local:VersionManager.FilterString}"/>
    </TextBox.Text>
</TextBox>

Everything compiles, but at run time, I get the following exception:

Cannot convert the value in attribute 'Source' to object of type 'System.Windows.Markup.StaticExtension'. Error at object 'System.Windows.Data.Binding' in markup file 'BurnDisk;component/selectversionpagefunction.xaml' Line 57 Position 29.

Any idea what I'm doing wrong?

解决方案

If the binding needs to be two-way, you must supply a path. There's a trick to do two-way binding on a static property, provided the class is not static : declare a dummy instance of the class in the resources, and use it as the source of the binding.

<Window.Resources>
    <local:VersionManager x:Key="versionManager"/>
</Window.Resources>
...

<TextBox Text="{Binding Source={StaticResource versionManager}, Path=FilterString}"/>

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