Server.Mappath in C# classlibrary

Question

How can i use the server.mappath method in a C# class library class ,which acts as my BusinessLayer for My ASP.NET WEbsite

Jacktar

Answer 1

By calling it?

var path = System.Web.HttpContext.Current.Server.MapPath("default.aspx");

Make sure you add a reference to the System.Web assembly.

Lutyens

i should say that system.web assembly does not exist in .net framework 4 – Kentigera

The worst solution! What if we need to use Business Layer classes out of HTTP Context? – Pepe

Here is the right answer #12294958 – Pepe

This answer is both not portable (outside of web applications) and not testable in unit tests. I agree with Ninja here. You can use IOC to inject the value, perhaps with an interface. – Charinile

Answer 2

You can get the base path by using the following code and append your needed path with that.

string  path = System.AppDomain.CurrentDomain.BaseDirectory;

Dexter

Answer 3

You should reference System.Web and call:

  HttpContext.Current.Server.MapPath(...)

Nankeen

Answer 4

Use this System.Web.Hosting.HostingEnvironment.MapPath().

HostingEnvironment.MapPath("~/file")

Wonder why nobody mentioned it here.

Tenuis

What's the difference between this and System.Web.HttpContext.Current.Server.MapPath ? I couldn't find any thing concrete between the two – Kilmer

Answer 5

Maybe you could abstract this as a dependency and create an IVirtualPathResolver. This way your service classes wouldn't be bound to System.Web and you could create another implementation if you wanted to reuse your logic in a different UI technology.

Nephograph

Answer 6

HostingEnvironment.MapPath
System.Web.Hosting.HostingEnvironment.MapPath(path);

Lyophilize

Answer 7

Architecturally, System.web should not be referred in Business Logic Layer (BLL). Employ BLL into the solution structure to follow the separate of concern principle so refer System.Web is a bad practice. BLL should not load/run in Asp.net context. Because of the reason you should consider using of System.AppDomain.CurrentDomain.BaseDirectory instead of System.Web.HttpContext.Current.Server.MapPath

Aeneid