问题
I need to use Server.MapPath() to combine some files path that I store in the web.config.
However, since Server.MapPath() relies on the current HttpContext (I think), I am unable to do this. When trying to use the method, even though its "available", I get the following exception:
Server operation is not available in this context.
Is there another method that can map a web root relative directory such as ~/App_Data/ to the full physical path such as C:\inetpub\wwwroot\project\App_data\ ?
回答1:
You could try System.Web.Hosting.HostingEnvironment.MapPath().
No HttpContext required.
回答2:
Use AppDomain.CurrentDomain.BaseDirectory because Context might return null !!
回答3:
When in Global.asax, use the context object:
context.Server.mappath()
Context lets you access also the session collection, the request object, the response object. Very useful when you want to log errors, for example
回答4:
You could try HttpContext.Current.Server.MapPath("/") - That's how I have referenced it before in classes.
来源：https://stackoverflow.com/questions/935940/how-can-i-use-server-mappath-from-global-asax