我有一个侧项目，我的WinForms几年前写的。为了更好地帮助我学习WPF中，我想重写在WPF。理想情况下，我想只修改当前的项目，我已经和重写创建一个新项目的WPF用户界面代替。

I have a side project that I wrote a few years ago in WinForms. To better help me learn WPF, I would like to rewrite it in WPF. Ideally, I would like to just modify the current project that I have and rewrite the UI in WPF instead of creating a new project.

我有一些问题，这样做。我做了以下（使用Visual Studio 2008 SP1）：

I'm having some problems doing that. I did the following (using Visual Studio 2008 SP1):

在这一点上，我发现有些不对劲。当我右键单击该项目，并选择添加|新的项目，我没有选择创建一个WPF窗口 - 我可以创建的唯一WPF类是WPF用户控件。因为我身边有一些其他的WPF项目，我复制的App.xaml。*和Window1.xaml。*从该项目开采，并根据需要进行更新（基本上只是改变该项目的命名空间，以我的项目的命名空间）。

At this point, I noticed something was amiss. When I right clicked the project and selected Add | New Item, I did not have an option to create a WPF Window - the only WPF class that I could create is a WPF User Control. Since I had some other WPF projects around, I copied App.xaml.* and Window1.xaml.* from that project to mine, and updated them as necessary (basically just changing the namespace of that project to the namespace of my project).

我然后删除Program.cs中（其中previously包含的主要方法，即显示主winform形式），并建项目。我得到一个错误，指出没有主要方法。

I then deleted Program.cs (which previously contained the Main method, that displayed the main WinForm Form), and built the project. I got an error indicating that there is no Main method.

这似乎是内部的Visual Studio知道，这个项目实在是WinForms应用程序，而不是一个WPF应用程序。在一个WPF项目（通过选择WPF应用程序创建），在应用程序的性能，我可以设置应用程序类作为启动对象的实例。在我的WinForms转化项目，这是不是一种选择。

It seems like internally Visual Studio knows that this project is really a WinForms app, and not a WPF app. In a WPF project (created by selecting "WPF Application"), in the Application properties I can set the instance of the Application class as a start up object. In my WinForms converted project, that isn't an option.

我参加了一个快速浏览一下在文本编辑器中的.csproj文件，但我找不到任何会告诉Visual Studio中，该项目真正的WinForms，而不是WPF。

I took a quick look at the .csproj file in a text editor, but I couldn't find anything that would tell Visual Studio that the project is really WinForms rather than WPF.

还有什么我需要做的，把我的WinForms项目变成了真正的WPF项目？难道我有一个选项不是创建一个新的项目，只是取代我当前的项目等？

What else do I need to do to turn my WinForms project into a "real" WPF project? Do I have an option other than creating a new project and just replacing my current project?

更新：我仔细看的.csproj文件，我注意到App.xaml中加入一个页面：

Update: I took a closer look at the .csproj files, and I noticed that App.xaml was added as a page:

<Page Include="App.xaml">
  <Generator>MSBuild:Compile</Generator>
  <SubType>Designer</SubType>
</Page>

不过，在我的其他的WPF项目，它是一个ApplicationDefinition。有一次，我改变了这一切，我可以把我的应用实例作为启动对象，我的应用程序将运行。我还没有一个选项来创建任何类型的WPF比用户控件等，虽然。

However, in my other WPF project, it is an ApplicationDefinition. Once I changed that, I could set my Application instance as the start up object, and my app would run. I still don't have an option to create any WPF types other than User Controls, though.

推荐答案

我不知道做的某种的项目文件中有什么通知的Visual Studio是什么类型的项目正在被使用，但我的猜测是ProjectTypeGuids是关键。

I don't know for certain what in the project file informs Visual Studio what type of project is being used, but my guess is the "ProjectTypeGuids" is key.

我的WPF项目有这样的：

My WPF projects have this:

<ProjectTypeGuids>
   {60dc8134-eba5-43b8-bcc9-bb4bc16c2548};
   {FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}
</ProjectTypeGuids>

这里是一个链接我发现它描述的GUID，什么样的项目，他们重新present。你会发现，以60DC的GUID的链接，WPF应用程序列表相匹配。

Here is a link I found which describes the guids and what kind of project they represent. You'll notice that the guid starting with "60DC" matches the list in the link for WPF applications.