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Map File Path in Web API To get the physical file path in a Web API, you need to use HostingEnvironment. MapPath() method. var sPath = System.
If path is null , the MapPath method returns the full physical path of the directory that contains the current request for the path. The relative path does not need to specify an existing file or folder for this method to return a value. However, you cannot specify a path outside of the Web application.
The MapPath method maps the specified relative or virtual path to the corresponding physical directory on the server.
Generally this physical and virtual path problem occurred whenever we refer “Server. MapPath” value multiple times while using folder path in applications. To solve this e:is a physical path but a virtual path was expected we need to use Server.
You can use HostingEnvironment.MapPath in any context where System.Web objects like HttpContext.Current are not available (e.g also from a static method).
var mappedPath = System.Web.Hosting.HostingEnvironment.MapPath("~/SomePath");
See also What is the difference between Server.MapPath and HostingEnvironment.MapPath?
string root = HttpContext.Current.Server.MapPath("~/App_Data");
As an aside to those that stumble along across this, one nice way to run test level on using the HostingEnvironment call, is if accessing say a UNC share: \example\ that is mapped to ~/example/ you could execute this to get around IIS-Express issues:
#if DEBUG
var fs = new FileStream(@"\\example\file",FileMode.Open, FileAccess.Read);
#else
var fs = new FileStream(HostingEnvironment.MapPath("~/example/file"), FileMode.Open, FileAccess.Read);
#endif
I find that helpful in case you have rights to locally test on a file, but need the env mapping once in production.
I can't tell from the context you supply, but if it's something you just need to do at app startup, you can still use Server.MapPath in WebApiHttpApplication; e.g. in Application_Start().
I'm just answering your direct question; the already-mentioned HostingEnvironment.MapPath() is probably the preferred solution.
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