Remove special character from filename while uploading C#

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Hi! i WANT to remove special character from filename while uploading file in C#, asp.net.

What I have tried:

ASP.NET

if (UploadFile.HasFile)
        {
           
            hdOrgFileName.Value = UploadFile.FileName.Substring(0, UploadFile.FileName.LastIndexOf("."));
            hdFileName.Value = UploadFile.FileName.Substring(0,UploadFile.FileName.LastIndexOf(".")) + DateTime.Now.ToString("MMmm");
            UploadFile.SaveAs(Server.MapPath("PdfTemplate/" + hdFileName.Value + ".pdf"));
            SautinSoft.PdfFocus f = new SautinSoft.PdfFocus();
            f.Serial = "10025522771";
            f.HtmlOptions.IncludeImageInHtml = true;
            f.OpenPdf(Server.MapPath("PdfTemplate/" + hdFileName.Value + ".pdf"));

            if (f.PageCount > 0)
            {
                int result = f.ToHtml(Server.MapPath("HtmlTemp/" + hdFileName.Value + ".html"));
            }

            dvPDF.Attributes.Add("w3-include-html", "HtmlTemp/" + hdFileName.Value + ".html");


            RunJs("hidepopup();");

        }

Posted 3-Feb-21 20:38pm

Member 14976405

Updated 3-Feb-21 20:46pm

RickZeeland

v2

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2 solutions

Solution 1

There are several options, see answers here:
c# - Most efficient way to remove special characters from string - Stack Overflow[^]

Posted 3-Feb-21 20:44pm

RickZeeland

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OriginalGriff · Accepted Answer · 2021-02-03T20:46:00

Solution 2

First decide what is a "special character" and exactly what you are going to do with it.
In many cases, the simplest solution is to specify a range of "wanted" characters and replace or remove everything else.

The simplest way to do that is to use a Regex.
For example, to replace anything which isn't a letter or digit with '_' is pretty trivial:

C#

string newName = Regex.Replace(fileName, "[^\\w]", "_");

Posted 3-Feb-21 20:46pm

OriginalGriff

Comments

Member 14976405 4-Feb-21 2:48am

is this i add to my c# code?

OriginalGriff 4-Feb-21 3:34am

If that's what you want to do - replace anything that isn't a alphanumeric character with "_" - then yes. What I'd do is grab a set of "sample inputs" and try the code in a small test program to make sure it does exactly what you want. If it doesn't, it's easier to tweak it there than in your main app.

Member 14976405 4-Feb-21 4:57am

i am confused how to use this in my code!

OriginalGriff 4-Feb-21 5:24am

How are you confused?
You have a method call, that takes an input string and returns a modified string.

What do you expect to do with it?

Member 14976405 4-Feb-21 7:51am

Thank you its working now!

OriginalGriff 4-Feb-21 8:17am

You're welcome!