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POC# Sanitize File Name
 

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    <p>I recently have been moving a bunch of MP3s from various locations into a repository. I had been constructing the new file names using the ID3 tags (thanks, TagLib-Sharp!), and I noticed that I was getting a <code>System.NotSupportedException</code>: </p> <blockquote> <p><em>"The given path's format is not supported."</em></p> </blockquote> <p>This was generated by either <code>File.Copy()</code> or <code>Directory.CreateDirectory()</code>.</p> <p>It didn't take long to realize that my file names needed to be sanitized. So I did the obvious thing:</p> <pre><code>public static string SanitizePath_(string path, char replaceChar) { string dir = Path.GetDirectoryName(path); foreach (char c in Path.GetInvalidPathChars()) dir = dir.Replace(c, replaceChar); string name = Path.GetFileName(path); foreach (char c in Path.GetInvalidFileNameChars()) name = name.Replace(c, replaceChar); return dir + name; } </code></pre> <p>To my surprise, I continued to get exceptions. It turned out that ':' is not in the set of <code>Path.GetInvalidPathChars()</code>, because it is valid in a path root. I suppose that makes sense - but this has to be a pretty common problem. Does anyone have some short code that sanitizes a path? The most thorough I've come up with this, but it feels like it is probably overkill.</p> <pre><code> // replaces invalid characters with replaceChar public static string SanitizePath(string path, char replaceChar) { // construct a list of characters that can't show up in filenames. // need to do this because ":" is not in InvalidPathChars if (_BadChars == null) { _BadChars = new List&lt;char&gt;(Path.GetInvalidFileNameChars()); _BadChars.AddRange(Path.GetInvalidPathChars()); _BadChars = Utility.GetUnique&lt;char&gt;(_BadChars); } // remove root string root = Path.GetPathRoot(path); path = path.Remove(0, root.Length); // split on the directory separator character. Need to do this // because the separator is not valid in a filename. List&lt;string&gt; parts = new List&lt;string&gt;(path.Split(new char[]{Path.DirectorySeparatorChar})); // check each part to make sure it is valid. for (int i = 0; i &lt; parts.Count; i++) { string part = parts[i]; foreach (char c in _BadChars) { part = part.Replace(c, replaceChar); } parts[i] = part; } return root + Utility.Join(parts, Path.DirectorySeparatorChar.ToString()); } </code></pre> <p>Any improvements to make this function faster and less baroque would be much appreciated.</p>
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    1. COpossible duplicate of [How to remove illegal characters from path and filenames?](http://stackoverflow.com/questions/146134/how-to-remove-illegal-characters-from-path-and-filenames)
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