将url.action作为json对象返回mvc(return url.action as json object mvc)

 这取决于您对XAML / WPF的未来计划。 如果你想要启动并运行并尽可能快地使用它，你可以考虑同时从XAML和WPF开始（但请注意，你不能学习或使用WPF只是学习XAML）。 
 
 如果你计划长时间使用XAML / WPF并且你将面临很多WPF项目，你可能应该考虑从“纯”WPF开始。 
 
 我属于后一阵营，它首先了解WPF对象模型，渲染和布局系统，然后从XAML，样式，模板等开始，帮助我很多。对我而言，它使思考更容易理解（并且有一个很多东西要理解）。 我知道XAML只是表示/序列化.NET对象图形的另一种方式，该对象图形构建在顶层。 这也是Charles Petzold的书的结构，我认为当你想要真正了解WPF时，它是一本完美的书。 

It depends on what your future plans are with XAML/WPF. If you want to get up and running and use it as quick as possible you might consider starting with XAML and WPF at the same time (but note that you can't learn or use WPF just be learning about XAML).
 
If you plan to work with XAML/WPF for a long time and you will have a lot of WPF projects ahead you probably should consider starting with "pure" WPF. 
 
I belong to the latter camp and it helped me a lot to first get to know the WPF object model, rendering and layout system and then start with XAML, styles, templates etc. For me it made thinks easier to understand (and there is a lot to understand). I understood that XAML is just another way to represent/serialize a .NET object graph that is built as a layer on top. This is also the way Charles Petzold's book is structured and I think it is the perfect book to start with when you want to get to know WPF really well.