无法识别HttpPostedFileBase，但可以识别“使用System.Web”

Question

I'm trying to define a function which accepts as a parameter an object of type System.Web.HttpPostedFileBase .

At the top of my class I included using System.Web; and the compiler is not too upset with that using statement. (It claims the statement is not necessary, but it is not throwing an error.)

However, the compiler gives the following error when I define a parameter of type 'HttpPostedFileBase': The type or namespace name could not be found (are you missing a using directive or an assembly reference?)

Why is the compiler throwing this error? I included the necessary using directive and assembly reference, no?

Answer 1

You need to add a reference to System.Web from the Solution Explorer side panel. Simply adding a using statement will not add the reference.