Using Server.MapPath in external C# Classes in ASP.NET

you can also use:

var path = System.Web.Hosting.HostingEnvironment.MapPath("~/App_Data/myfile.txt")

if

var path = Server.MapPath("~/App_Data");var fullpath = Path.Combine(path , "myfile.txt");

is inaccessible

Can't you just add a reference to System.Web and then you can use Server.MapPath ?

Edit: Nowadays I'd recommend using the HostingEnvironment.MapPath Method:

It's a static method in System.Web assembly that Maps a virtual path to a physical path on the server. It doesn't require a reference to HttpContext.

System.Reflection.Assembly.GetAssembly(type).Location

IF the file you are trying to get is the assembly location for a type. But if the files are relative to the assembly location then you can use this with System.IO namespace to get the exact path of the file.

I use this too:

System.Web.HTTPContext.Current.Server.MapPath

class test{public static void useServerPath(string path){if (File.Exists(path){\\...... do whatever you wabt}else{\\.....}}

Now when you call the method from the codebehind

for example :

protected void BtAtualizacao_Click(object sender, EventArgs e){string path = Server.MapPath("Folder") + "\\anifile.txt";test.useServerPath(path);}

in this way your code is to simple and with one method u can use multiple path for each call :)

This one helped for me

//System.Web.HttpContext.Current.Server.MapPath // FileStream fileStream = new FileStream(System.Web.HttpContext.Current.Server.MapPath("~/File.txt"),FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);

Whether you're running within the context of ASP.NET or not, you should be able to use HostingEnvironment.ApplicationPhysicalPath

The server.mappath("") will work on aspx page,if you want to get the absolute path from a class file you have to use this-

HttpContext.Current.Server.MapPath("~/EmailLogic/RegistrationTemplate.html")