C# String Replace의 효율적인 인스턴스 방법

 
  
[ThreadStatic] 
  
        static char[] mTempChars; 
  
 
  
        protected static char[] GetTempData() 
  
        { 
  
            if (mTempChars == null) 
  
                mTempChars = new char[1024 * 64]; 
  
            return mTempChars; 
  
        } 
  
 
  
        public static string Replace(string value, string oldData, string newData) 
  
        { 
  
            char[] tmpchars = GetTempData(); 
  
            int newpostion = 0; 
  
            int oldpostion = 0; 
  
            int length = value.Length; 
  
            int oldlength = oldData.Length; 
  
            int newlength = newData.Length; 
  
            int index = 0; 
  
            int copylength = 0; 
  
            bool eq = false; 
  
            while (index < value.Length) 
  
            { 
  
                eq = true; 
  
                for (int k = 0; k < oldlength; k++) 
  
                { 
  
                    if (value[index + k] != oldData[k]) 
  
                    { 
  
                        eq = false; 
  
                        break; 
  
                    } 
  
 
  
                } 
  
                if (eq) 
  
                { 
  
                    copylength = index - oldpostion; 
  
                    value.CopyTo(oldpostion, tmpchars, newpostion, copylength); 
  
                    newpostion += copylength; 
  
                    index += oldlength; 
  
                    oldpostion = index; 
  
                    newData.CopyTo(0, tmpchars, newpostion, newlength); 
  
                    newpostion += newlength; 
  
 
  
                } 
  
                else 
  
                { 
  
                    index++; 
  
                } 
  
            } 
  
            if (oldpostion < length) 
  
            { 
  
                copylength = index - oldpostion; 
  
                value.CopyTo(oldpostion, tmpchars, newpostion, copylength); 
  
                newpostion += copylength; 
  
            } 
  
            return new string(tmpchars, 0, newpostion); 
  
        }