WPF双向绑定到一个静态类属性 [英] WPF TwoWay Binding to a static class Property

问题描述

还有，如果模式=单向没有问题，但我有这样的： 类别：

There's no problem if Mode=OneWay, but I have this: Class:

namespace Halt
{
    public class ProjectData
    {
            public static string Username {get;set;}
    }
}

和XAML：

xmlns:engine="clr-namespace:Halt.Engine"
<TextBox Name="UsernameTextBox" HorizontalAlignment="Stretch" Margin="10,5,10,0" Height="25"
         Text="{Binding Source={x:Static engine:ProjectData.Username}, Mode=TwoWay}"/>

由于双向模式，这不想要的工作。那么如何解决这个问题？

This dont wanna work because of TwoWay mode. So how to fix it?

推荐答案

如果绑定需要是双向的，你必须提供一个路径。还有一招，做双向的静态属性绑定，提供的类不是静态的：声明类的资源，一个虚拟实例，并把它作为绑定的源

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:ProjectData x:Key="projectData"/>
</Window.Resources>
...

<TextBox Name="UsernameTextBox" HorizontalAlignment="Stretch" Margin="10,5,10,0" Height="25"
         Text="{Binding Source={StaticResource projectData}, Path=Username}"/>

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