Remove Special characters from file name

Question

I need to remove special characters from file, I tried following code based on this example, it is generating few errors. I need this code to work for asp.net webform based application.

using System;
using System.Linq;
using System.Text.RegularExpressions;

public class Test {
    public static void Main() {
        // your code goes here

        var file_name = GetValidFileName("this is)file<ame.txt");
        Console.WriteLine(file_name);
        private static string GetValidFileName(string fileName) {
            // remove any invalid character from the filename.
            return Regex.Replace(fileName.Trim(), "[^A-Za-z0-9_. ]+", "");
        }
    }
}

Sample code on & output ideone.com

What are the errors actually generated? – Codor Oct 14 '14 at 08:31 — Codor, Oct 14 '14 at 08:31
Error is listed here http://ideone.com/FzpqfC – Learning Oct 14 '14 at 08:32 — Learning, Oct 14 '14 at 08:32
http://stackoverflow.com/a/8626562/284240 – Tim Schmelter Oct 14 '14 at 08:32 — Tim Schmelter, Oct 14 '14 at 08:32

Tinwor · Accepted Answer · 2014-10-14T08:43:33.697

14

You have put private static string GetValidFileName in public static void Main() and in C# is not allowed. Just simple change the code as follow and it will work:

using System;
using System.Linq;
using System.Text.RegularExpressions;

public class Test {
    public static void Main() {
    // your code goes here

    var file_name = GetValidFileName("this is)file<ame.txt");
    Console.WriteLine(GetValidFileName(file_name));

    }
    private static string GetValidFileName(string fileName) {
        // remove any invalid character from the filename.
        String ret = Regex.Replace(fileName.Trim(), "[^A-Za-z0-9_. ]+", "")
        return ret.Replace(" ", String.Empty);
    }
}

edited Oct 14 '14 at 08:43

answered Oct 14 '14 at 08:37

Tinwor

7,765
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56

It worked but file have has white space `this isfileame.txt` how can i remove white space from file name. – Learning Oct 14 '14 at 08:40
Edited answer. I've used String.Replace instead of regex to remove whitespace only because it's more easy and readble – Tinwor Oct 14 '14 at 08:44

score -1 · Answer 2 · answered Feb 09 '21 at 12:23

-1

string newName = UploadFile.FileName.Replace("&", "and");

answered Feb 09 '21 at 12:23

Bilal Raza

1

score -1 · Answer 3 · answered Dec 15 '22 at 08:49

Try this:

Console.WriteLine("Type a File Name:");
char[ ] invalidChars = System.IO.Path.GetInvalidFileNameChars();

string? FileName = Console.ReadLine();
if( FileName != null )
{
   string OutputFileName="";
   
   for (int i = 0; i < FileName.Length; i++)
   {
      char c = FileName[i];

      if (! invalidChars.Contains(c))
      {
         OutputFileName += c;
      }
   }
   Console.WriteLine("Output :");
   Console.WriteLine(OutputFileName);
}

Remove Special characters from file name

3 Answers3

Linked