不会每次访问都编译吧,应该只是第一次使用的时候编译。ASP.NET automatically compiles your application code and any dependent resources the first time a user requests a resource from the Web site. In general, ASP.NET creates an assembly for each application directory (such as App_Code) and one for the main directory. (If files in a directory are in different programming languages, then separate assemblies will be created for each language.) You can specify which directories are compiled into single assemblies in the Compilation section of the Web.config file.来自:http://msdn.microsoft.com/en-us/library/ms178466(v=VS.90).aspx
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