当用户打开应用程序两次时，如何避免任务栏按钮被合并到我的应用程序中？

Question

In more recent versions of Windows the taskbar will combine two buttons together when I open the same application twice. What can I do to avoid that (not counting changing the Windows settings, because I want it for my application only, not all applications).

Answer 1

Raymond Chen has detailed how to do this a while ago on his blog: How do I customize how my application windows are grouped in the Taskbar? :

All the information in this article came from the article Application User Model IDs (AppUserModelIDs) in MSDN.

Okay, so suppose your application is really a runtime for other applications. What you need to do is assign a different AppID to each of the applications you are hosting. The mechanism for this is up to you. Your applications might explicitly provide a unique ID, or you may be able to infer one. For example, if you are Internet Explorer and your "applications" are pinned Web sites, you can use the URL of the site being pinned as the unique ID.

You then get to take your unique IDs and create AppIDs for them. The format of an AppID is

 CompanyName.ProductName.SubProduct.VersionInformation 

where the SubProduct is optional, and the VersionInformation is present only if you want different versions of your app to be treated as distinct. (If you want an upgraded version to be a replacement for the old version, then omit the VersionInformation so that the old and new versions use the same AppID.)

You then assign this AppID to every window associated with the "application". You can do this for an entire process by calling SetCurrentProcessExplicitAppUserModelID , or you can do it on a window-by-window basis by setting the PKEY_AppUserModel_ID property.