我想问问是否WPF具有任何功能，通过它可以在结合当绑定做是为了类型的对象对象。我有类型的泛型集合对象，必须处理为一个对象类型或其他（即的DateTime ， INT 等），在它的各种结合点。

I wanted to ask if WPF has any functionality by which one can define a target type on a binding when the binding is done to an object of type "object". I have a generic collection of type "object" that must be handled as one object type or the other (ie. DateTime, int, etc.) at its various binding points.

有什么办法，我可以随意强制.net框架在编译时为 Type_X 的对象来对待未知类型的对象，对案件逐案基础处理绑定的时候？

Is there any way that I can arbitrarily force the .Net framework to treat objects of unknown type at compile time as objects of Type_X, on a case-by-case basis when handling bindings?

推荐答案

没有，的 绑定 类不提供任何这样的功能;其实这并不需要，绑定框架源对象相关类型的自动转换，并且使用绑定的属性值，否则，如果未找到该属性引发一个绑定错误。

No, Binding class doesn't provide any such feature; Actually it doesn't need to, Binding framework automatically converts the source object to relevant type and uses the bound property value, or else raises a binding error if that property is not found.

所以，如果我有对象键入的属性我视图模型

So if I have a property of Object type in my ViewModel

public object Dummy 
{ 
    get 
    { 
        return dummy; 
    } 
    set 
    { 
        dummy = value;
        NotifyPropertyChanged("Dummy");
    } 
} 

和我绑定到一个文本框这样的 -

and I bound it to a TextBox like this -

<TextBox Text="{Binding Dummy.Name}" HorizontalAlignment="Stretch"/>

和以后设置虚拟到这样一个对象 -

and later set the Dummy to an object like this -

Dummy = new MyCustomType();

在这一点上结合将评估并试图找到名称源对象的属性（假）和如果 MyCustomType 定义了一个名为公共财产名称然后结合将执行否则会产生一个绑定错误（不例外只是一个错误味精，在输出窗口）。

at this point binding will evaluate and try to find the Name property in the source object(Dummy) and if MyCustomType defines a public property named Name then binding will execute else a binding error will occur( no exception just an error msg. in output window).

现在，如果我想我的假属性设置为两种不同类型的对象（一个有名称和其他具有名字），那么我有两个选择 -

Now, in case I want to set my Dummy property to objects of two different types(one having Name and other having FirstName) then I have two options -

使用的另一种变体 ValueConverter 被定义的 类型转换器 做转换并声明它的 TypeConverterAttribute ，然后在绑定自动转换将完成。

Another variant of using ValueConverter is defining a TypeConverter to do conversion and declare it with the TypeConverterAttribute, then in bindings automatic conversion will be done.

同样适用于收集对象。

更新：

是的，WPF将隐式使用 DefaultType的转换器的类型转换为相应的显示值。如果您绑定的对象直接属性（文本在上面的例子中），那么WPF将使用类型转换器为该类型（如果可用），或使用的ToString（）方法获取的显示值。

Yes, WPF will implicitly use DefaultType converter to convert your type to relevant display value. In case you bind the Object directly to a property(Text in above example) then WPF will use the TypeConverter for that type(if available) or use the ToString() method to get the display value.

不过，这一切都取决于你所使用的显示数据，以及如何/你要绑定什么控制。

But all this depend on the control you are using for displaying the data and how/what you are binding.

请注意：这招只对足以能够有简单的对象   文本重新presentations。它可能没有意义的使用   在处理复杂的数据对象处理方便的技术。

Note: This trick only suffices for objects that can have simple textual representations. It might not make sense to use this convenient technique when dealing with complex data objects.

您可以通过这篇文章在MSDN上谈到了这一点 -   自定义数据显示与数据绑定和WPF

You can go through this article on MSDN which talks about this - Customize Data Display with Data Binding and WPF