how to get website root path in c#?

In c# code, I need to write src for an image. Does anyone know how to get webs开发者_运维百科ite root path in c#? My folder structure is UI/Image I found that when I use

string rootpath=Page.Request.ApplicationPath;

If run the application in debug model, it works. But if run it by typing url directly, it won't show image. The property of the image is http://image/turnon.bmp which should be http://localhost/image/turnon.bmp

Any idea?

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An easy way is use MapPath with the ~ wildcard:

string imagePath = MapPath("~/image/turnon.bmp");

As Dan Csharpster stated in the comments, since the Server object which exposes the MapPath method is not directly available in a class library the command should be

string imagePath = HttpContext.Current.Server.MapPath("~/image/turnon.bmp");

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Simple use the ~ sign

as the ~ represents the root of your app.

so yourimage url will be

<img    src='<%= Server.MapPath("~/images/1.jpg") '  />

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i had the same problem when I was using ASP.NET MVC2. you can use this:

ResolveClientUrl("~/Content/Icons/loading1.gif")
or  Url.Resolve()

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When you are not in a mvc / web forms context use VirtualPathUtility: http://msdn.microsoft.com/en-AU/library/system.web.virtualpathutility.toapprelative.aspx

var siteRoot = VirtualPathUtility.ToAppRelative("~"); 

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This is for the root of the virtual path not the physical directory of the website on the server In a c# MVC 5 controller this works for me.

string siteRoot = System.Web.VirtualPathUtility.ToAbsolute("~");