How to retrieve back the saved file name(without guid) from physical location

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Please see below the code snippet. I had uploaded files & saved in physical folder with guid appended to the file name. Please see below. My purpose is to get back the file names without guid as shown below.

C#

HttpPostedFile PostedFile = Request.Files[i];
if (PostedFile.ContentLength > 0)
{
    Guid guid = Guid.NewGuid();
    string fileNameOrg = Path.GetFileName(PostedFile.FileName);
    string extention = Path.GetExtension(fileNameOrg);
    string fileNameNew = fileNameOrg.Replace(extention, "") + guid + extention;
    PostedFile.SaveAs(path + @"\" + fileNameNew);
}

SAVED FILE NAME : text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt
SAVED FILE NAME : text296a712ff-efd9-4ab9-9f38-801e0fd23272.txt

Now My purpose is to extract only the file name without GUID
That is

OUTPUT FILE NAME : text1.txt
OUTPUT FILE NAME : text2.txt

Thanks in advance.

Posted 14-Oct-15 1:31am

Member 8478234

Updated 14-Oct-15 1:37am

Tomas Takac

v2

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Comments

ZurdoDev 14-Oct-15 8:20am

If you need it at the same time as the above code then the answer is obvious, store the filename in a separate variable before adding in GUID.

If you need it after the fact, later on, then I suggest parsing it. You could do regex or you could save the file name with a dash between name and GUID and then you can get everything before the first dash, for example.

Richard MacCutchan 14-Oct-15 8:32am

Since you know the length of the GUID, it is a simple matter to strip those characters from the filename.

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OriginalGriff · Answer 1 · 2015-10-14T02:31:00

Solution 1

Easy:

C#

string inp = "text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt";
const int guidLen = 36;
int extLen = inp.Length - inp.LastIndexOf('.');
string filename = inp.Substring(0, inp.Length - (extLen + guidLen)) + Path.GetExtension(inp);

Posted 14-Oct-15 2:31am

OriginalGriff

23741 · Answer 2 · 2015-10-14T02:42:00

To make things more efficient, you might reconsider saving the file name as follows:

string fileName = Guid.NewGuid().ToString() + "-" + Path.GetFileName(PostedFile.FileName);

That way, to determine the original uploaded file name later, all you need is the substring starting at the end of the guid and dash.

The reason I say this - imagine 1,000,000 users uploading 10 files each at the same time :-)

Rene.