https://learn.microsoft.com/zh-tw/dotnet/api/system.web.compilation.buildmanager.createinstancefromvirtualpath?view=netframework-4.8.1
BuildManager.CreateInstanceFromVirtualPath(String, Type) Method (System.Web.Compilation) |...
Processes a file, given its virtual path, and creates an instance of the result.
system webstringtypemethodcompilation