将整数转化为字符串类型（string）

以下代码将一个整数(包括0)转化为字符串类型（string）返回：
 
private  string IntToString( int integer)
      {
        string result = "";
        int temp = integer;
       
        if (temp == 0)
        {
            result = "0";

            return result;
        }
        while (temp != 0)
        {
            // add a digit to the head of a string
            switch (temp % 10)
            {
              case 0:
                  result = '0' + result;
                  break;

              case 1:
                  result = '1' + result;
                  break;

              case 2:
                  result = '2' + result;
                  break;
 
              case 3:
                  result = '3' + result;
                  break;
 
              case 4:
                  result = '4' + result;
                  break;

              case 5:
                  result = '5' + result;
                  break;

              case 6:
                  result = '6' + result;
                  break;

              case 7:
                  result = '7' + result;
                  break;

              case 8:
                  result = '8' + result;
                  break;

              case 9:
                  result = '9' + result;
                  break;
              }
              temp = ( temp - (temp % 10) ) / 10;
          }

          return result;
      }