Get File Extension by Filename

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hi... i want to ask something,,

how to get file extension by filename?

i have code below:

C#

string id = "34";
string ext = System.IO.Path.GetExtension(Server.MapPath(Request.ApplicationPath + @"\Images\") + id);
Response.Write(ext);

revise my code please...

Posted 28-Sep-11 21:17pm

Ade.Ruyani.Z

Updated 28-Sep-11 21:20pm

Mehdi Gholam

v2

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Ade.Ruyani.Z 29-Sep-11 3:36am

sorry every one,,i have a file 34.png n iwant get fileextension in folder images, and find that file extension just only call a filename? can i do that?

Muralikrishna8811 29-Sep-11 5:05am

We can

I posted the code check it once

4 solutions

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Muralikrishna8811 · Accepted Answer · 2011-09-28T23:03:00

Hi,

I tried some code for you to get file extension by using filename

C#

DirectoryInfo dinfo = new DirectoryInfo(Server.MapPath("~/Images"));
           FileInfo[] finfo = dinfo.GetFiles("winter.*");
           int l=finfo.Length;
           string ext=Path.GetExtension(finfo[0].FullName);

Here you've to pass your file name instead of "winter"

Then The file information stored in finfo array.

So we can get that file extension

I hope you understood What I said

All the Best

Mehdi Gholam · Accepted Answer · 2011-09-28T21:21:00

Solution 1

Your file name "...\Images\34" has no extension.

Posted 28-Sep-11 21:21pm

Mehdi Gholam

Comments

Ade.Ruyani.Z 29-Sep-11 3:29am

yes.. i have a file 34.png,, can i just get fileextension with only call filename?

P.Salini · Accepted Answer · 2011-09-28T21:23:00

Solution 2

To get File Extension,

C#

Response.Write(Path.GetExtension(@"F:\Articles\ValidationControls\ValidationControls.zip"));

Refer below link

http://codes.codedigest.com/CodeDigest/68-Get-File-Extension--File-Name--File-Name-without-Extension-from-Path-in-C--and-ASP-Net.aspx[^]

Posted 28-Sep-11 21:23pm

P.Salini

Updated 28-Sep-11 23:18pm

v5

sravani.v · Accepted Answer · 2011-09-28T21:24:00

Solution 3

To get extension:

string ext = System.IO.Path.GetExtension(this.File1.PostedFile.FileName);

or

VB

Response.Write(Path.GetExtension(@"F:\Articles\ValidationControls\ValidationControls.zip"));

Posted 28-Sep-11 21:24pm

sravani.v

Updated 28-Sep-11 21:27pm

v2