C# 獲取字符串長度(一個漢字算兩個字節)

[csharp] 
/// <summary> 
       /// 獲取字符串長度，一個漢字算兩個字節 
       /// </summary> 
       /// <param name="str"></param> 
       /// <returns></returns> 
       public static int GetLength(string str) 
       { 
           if (str.Length == 0) return 0; 
           ASCIIEncoding ascii = new ASCIIEncoding(); 
           int tempLen = 0; byte[] s = ascii.GetBytes(str); 
           for (int i = 0; i < s.Length; i++) 
           { 
               if ((int)s[i] == 63) 
               { 
                   tempLen += 2; 
               } 
               else 
               { 
                   tempLen += 1; 
               } 
           } 
           return tempLen; 
       }