Fan.Sys.FanStr.caseInsensitiveHash C# (CSharp) Method

        public static int caseInsensitiveHash(string self)
        {
            int n = self.Length;
              int hash = 0;

              for (int i=0; i<n; i++)
              {
            int c = self[i];
            if ('A' <= c && c <= 'Z') c |= 0x20;
            hash = 31*hash + c;
              }

              return hash;
        }

 public int GetHashCode(object obj)
 {
     return(FanStr.caseInsensitiveHash((string)obj));
 }