Sharepoint Insight by Namwar Rizvi

Sharepoint Tips, Tricks and inside knowledge from real world experience by Namwar Rizvi

How to generate a valid SharePoint FileName

Posted by namwar on June 17, 2010


SharePoint imposes several restrictions for the filenames. To get the details of all these restrictions, please check this support article from Microsoft. I have created a utility function to convert a given string to a valid SharePoint filename. This function is valid for SharePoint 2003, 2007 and 2010. Here you go

public string ConvertToValidSharePointFileName(string originalFileName)
        {
            char[] InvalidFilenameCharacters = new[] {'\\', '/', ':', '*', '?', '"', '<', '>', '|', '#', '{', '}', '%', '~','&' };
            string[] InvalidFileNameStrings = new[] { ".files", "_files", 
                "-Dateien", "_fichiers", "_bestanden","_file", 
                "_archivos", "-filer", "_tiedostot", "_pliki", 
                "_soubory","_elemei", "_ficheiros", "_arquivos", 
                "_dosyalar", "_datoteke","_fitxers", "_failid", 
                "_fails", "_bylos", "_fajlovi", "_fitxategiak"};
            
            string validSharePointFileName = originalFileName;

            //Remove Invalid characters
            validSharePointFileName = validSharePointFileName.Remove(InvalidFilenameCharacters);
            
            //Remove consecutive periods(..)
            while (validSharePointFileName.Contains(".."))
            {
                validSharePointFileName = validSharePointFileName.Replace("..", ".");
            }

            //Remove reserved words from end
            foreach (string s in InvalidFileNameStrings)
            {
                if (validSharePointFileName.EndsWith(s))
                {
                    if (validSharePointFileName.Length > s.Length)
                    {
                        validSharePointFileName = validSharePointFileName.Substring(0, validSharePointFileName.Length - s.Length);
                    }
                }
            }

            //Remove period (.) at end
            if (validSharePointFileName.EndsWith("."))
            {
                validSharePointFileName = validSharePointFileName.Remove(validSharePointFileName.Length - 1, 1);
            }

            //Remove period (.) at end
            if (validSharePointFileName.StartsWith("."))
            {
                validSharePointFileName = validSharePointFileName.Remove(0, 1);
            }

            return validSharePointFileName;
        }
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