WPF - 绑定到另一个对象内的自定义对象的属性 [英] WPF - binding to a property of a custom object that is inside another object

问题描述

我在WPF / C＃的工作。我有两个自定义类：

I'm working in WPF 4 / C#. I have two custom classes:

public class c1 {
    public string prop1 { get; set; }

    public c1() {
        prop1 = "world";
    }
}

public class c2 {
    public string prop1 { get; set; }
    public c1 obj1 = new c1();

    public c2() {
        prop1 = "hello";
    }
}

从内XAML，我要绑定到这些类的属性。以下是我有：

From within XAML, I want to bind to properties of these classes. Here is what I have:

<Window.Resources>
    <my:c2 x:Key="c2"/>
</Window.Resources>
<StackPanel>
    <TextBlock DataContext="{DynamicResource c2}" Text="{Binding prop1}"/>
    <TextBlock DataContext="{DynamicResource c2}" Text="{Binding obj1.prop1}"/>
</StackPanel>

（这里的＆LT;我：C2 ../& GT; 实例化C2类。）第一个TextBlock的结合的作品。第二不。为什么我不能绑定到该OBJ1的属性？我只似乎能够绑定到即时类的属性。我希望能够绑定到其他的东西像属于即时类或子类的属性，如上图所示数组中的元素。我在想什么？如果我包裹obj1.prop1使用的get / set立即类的另一个属性，它的工作原理。但我不希望有这样做，特别是当我开始使用数组，我不希望每个元素包装成一个单独的属性！

(Here the <my:c2 ../> instantiates the c2 class.) The first TextBlock binding works. The second does not. Why can't I bind to a property on the obj1? I only seem to be able to bind to properties of the immediate class. I want to be able to bind to other stuff like an element in an array that belongs to the immediate class or a property of a child class, as shown above. What am I missing? If I wrap the obj1.prop1 in another property of the immediate class using get/set, it works. But I don't want to have to do that, particularly if I start using arrays, I don't want to wrap each element into a separate property!

推荐答案

您 OBJ1 是一个领域，不是一个属性，因此，你不能访问C1对象。

Your obj1 is a field, not a property, therefore you can't access the C1 object.

考虑这个：

public class c2 {
    public string prop1 { get; set; }
    private readonly c1 _obj1;

    public c2() {
        prop1 = "hello";
        _obj1 = new c1();
    }

    public c1 PropObj1 { get { return _obj1; } }
}

和

<TextBlock DataContext="{DynamicResource c2}" Text="{Binding PropObj1.prop1}"/>

PS。下一次，最好使用标准的命名规则（例如小写场/变量，大写的属性等）为例，让人们看到了问题，越快！

PS. Next time better to use an example with standard naming conventions (e.g. lower case fields/variables, upper case properties etc) to allow people to see the problem sooner!

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