asp.net – 什么是global.asax用于?

ASP.NET中global.asax的用途是什么?

The Global.asax file, also known as the ASP.NET application file, is an optional file that contains code for responding to application-level and session-level events raised by ASP.NET or by HTTP modules. The Global.asax file resides in the root directory of an ASP.NET application. At run time, Global.asax is parsed and compiled into a dynamically generated .NET Framework class derived from the HttpApplication base class. ASP.NET is configured so that any direct URL request for the Global.asax file is automatically rejected; external users cannot download or view the code in it.
The Global.asax file is optional. You create it only if you want to handle application or session events.

(MSDN http://msdn.microsoft.com/en-us/library/2027ewzw%28v=vs.100%29.aspx)

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