System.Text.RegularExpressions.RegexCharClass.GetRangeAt C# (CSharp) Method

        private SingleRange GetRangeAt(int i) {
            return(SingleRange)_rangelist[i];
        }

 internal void AddCharClass(RegexCharClass cc)
 {
     if (!cc._canonical)
     {
         this._canonical = false;
     }
     else if ((this._canonical && (this.RangeCount() > 0)) && ((cc.RangeCount() > 0) && (cc.GetRangeAt(0)._first <= this.GetRangeAt(this.RangeCount() - 1)._last)))
     {
         this._canonical = false;
     }
     for (int i = 0; i < cc.RangeCount(); i++)
     {
         this._rangelist.Add(cc.GetRangeAt(i));
     }
     this._categories.Append(cc._categories.ToString());
 }