Pavel Nasovich's Blog

The Moderately Enthusiastic Programmer

Today I Learned: Sanitize File Name in C#

Posted at — Nov 17, 2015

A short update about safe file names in C#.

Sanitize File Name in C#

To clean up a file name you could do this

private static string MakeValidFileName(string name)
    string invalidChars = new string(Path.GetInvalidFileNameChars())
    string escapedInvalidChars = Regex.Escape();
    string invalidRegex = string.Format(@"([{0}]*\.+$)|([{0}]+)", escapedInvalidChars);

    return Regex.Replace(name, invalidRegex, "_");

Working example you can find on dotnetfiddle

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