Difference Between HttpContext.Current.Server.MapPath and HttpContext.Current.Request.Url.Authority

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1.00/5 (1 vote)

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Hi,

In my website i am uploading an audio file, which is saved in project folder. Then while viewing a page, i want to check whether the uploaded file exists in the project folder. How can i check it.Shall I used this function to get the URL and check whether file existed in that url

C#

public string GetAbsoluteUrl(string relativePath)
      {
          try
          {
              //Get host and port by using Authority
              //Get host only by DnsSafeHost
              string host = HttpContext.Current.Request.Url.Authority;
              string protocol = HttpContext.Current.Request.Url.Scheme;
              return string.Format("{0}://{1}/{2}", protocol, host, relativePath.Trim());
          }
          catch (Exception ex)
          {
              throw ex;
          }
      }

Or just use HttpContext.Current.Server.MapPath + Folder name+ file name and check whether the file exists or not.. Please help me out...

I also want to know what;s the difference between the two

Posted 24-Nov-13 20:25pm

Arjun Menon U.K

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Sergey Alexandrovich Kryukov 25-Nov-13 2:30am

The question makes no sense at all. This is the same as asking "what is the difference between sentence and suffix?" or "between car and plate number".

Read MSDN on each part of API, that's it.

—SA

Arjun Menon U.K 25-Nov-13 3:33am

Sorry for my lame Question Sergey

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OriginalGriff · Accepted Answer · 2013-11-24T21:23:00

Use Server.MapPath: It converts a relative-to-your-website path like "~/uploads/MP3/" to a full path specification you can use in the File.Exists method:

C#

if (File.Exists(Server.MapPath("~/Uploads/MP3/" + filename)))
    {
    ... do something with the file
    }

You would only need an absolute URL if you are planning on putting a permanent link to the file directly onto the clients webpage (which isn't a good idea, as it means the folder must be publically available).