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Test if the filename is legal

Posted on 2007-11-20
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Last Modified: 2013-11-07
I am building a filename on some text fields so if the user put in the wrong signs the filename will be illegal.

Is there a build in function in C# to test if the filename is legal?
If someone have a few lines of code that can do the same it will be helpfull as well.

/Peter
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Question by:PeterSvendsen
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2 Comments
 
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by:bungHoc
ID: 20318637
- Get all invalid path characters
- Use Regular Expressions to check if file name is legit


char[] invalidPathChars = System.IO.Path.GetInvalidPathChars();
string invalid = Regex.Escape (new string (invalidPathChars));
string validFileName = Regex.Replace (input, "[" + invalid + "]", "");

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bungHoc earned 500 total points
ID: 20318660
This should work better:
private bool isValidFilename(string filename)
{
  char[] invalidFileChars = Path.GetInvalidFileNameChars();
  return (filename.IndexOfAny(invalidFileChars) < 0);
}
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