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you and I are probably trying to do the same kind of thing.
So I will share whatever I have found while doing my own research.

你和我可能都在尝试做同样的事情。因此,在进行自己的研究时,我将分享我所发现的一切。

Oleg Sych was kind enough to point me to the ASP.NET MVC dll Microsoft.VisualStudio.Web.Extensions.dll file that contains the MvcTextTemplateHost class.
Take a look at this DLL using the .NET Reflector tool.

Oleg Sych非常友好地指向包含MvcTextTemplateHost类的ASP.NET MVC dll Microsoft.VisualStudio.Web.Extensions.dll文件。使用.NET Reflector工具查看此DLL。

C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\Microsoft.VisualStudio.Web.Extensions.dll

As you will see, the DLL contains WinForm classes such as MvcAddControllerDialog, MvcAddViewDialog, and other classes.
So I am pretty sure you can dig around in there to figure out how they did it.

正如您将看到的,DLL包含WinForm类,如MvcAddControllerDialog,MvcAddViewDialog和其他类。所以我很确定你可以在那里挖掘一下,弄清楚他们是如何做到的。

Another place to look is definitely the Visual Studio Extensibility Developer Center.
In the [Learning Center Resources] section, click on [Custom Wizards] link (msdn.microsoft.com/en-us/vsx/dd631327.aspx --- sorry I can include ONE Hyperlink per post at the moment).

另一个值得关注的地方是Visual Studio可扩展性开发人员中心。在[学习中心资源]部分,单击[自定义向导]链接(msdn.microsoft.com/en-us/vsx/dd631327.aspx ---抱歉,我现在可以在每个帖子中包含一个超链接)。

Wizards can be implemented in Visual Studio to let users select from a tree view of available values when they open the Add New Project dialog box or the Add New Item dialog box, or when they right-click an item in Solution Explorer.

可以在Visual Studio中实现向导,以便用户在打开“添加新项目”对话框或“添加新项”对话框时,或者在解决方案资源管理器中右键单击某个项时,从树视图中选择可用值。

So start from those two places. I will post some updates myself as well if I found out more.

所以从这两个地方开始。如果我发现更多,我会自己发布一些更新。