详解C# 不能用于文件名的字符

CON, PRN, AUX, CLOCK$, NULCOM0, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9LPT0, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9.

 public static string MakeValidFileName(string text, string replacement = "_")  {   StringBuilder str=new StringBuilder();   var invalidFileNameChars = System.IO.Path.GetInvalidFileNameChars();   foreach (var c in text)   {    if (invalidFileNameChars.Contains(c))    {     str.Append(replacement??"");    }    else    {     str.Append(c);    }   }   return str.ToString();  }

public static string GetSafeFilename(string arbitraryString){ var invalidChars = System.IO.Path.GetInvalidFileNameChars(); var replaceIndex = arbitraryString.IndexOfAny(invalidChars, 0); if (replaceIndex == -1) return arbitraryString; var r = new StringBuilder(); var i = 0; do {  r.Append(arbitraryString, i, replaceIndex - i);  switch (arbitraryString[replaceIndex])  {   case '"':    r.Append("''");    break;   case '<':    r.Append('/u02c2'); // '˂' (modifier letter left arrowhead)    break;   case '>':    r.Append('/u02c3'); // '˃' (modifier letter right arrowhead)    break;   case '|':    r.Append('/u2223'); // '' (divides)    break;   case ':':    r.Append('-');    break;   case '*':    r.Append('/u2217'); // '∗' (asterisk operator)    break;   case '//':   case '/':    r.Append('/u2044'); // '⁄' (fraction slash)    break;   case '/0':   case '/f':   case '?':    break;   case '/t':   case '/n':   case '/r':   case '/v':    r.Append(' ');    break;   default:    r.Append('_');    break;  }  i = replaceIndex + 1;  replaceIndex = arbitraryString.IndexOfAny(invalidChars, i); } while (replaceIndex != -1); r.Append(arbitraryString, i, arbitraryString.Length - i); return r.ToString();}