C#获取数字字符串数值连续字符串

C#获取数字字符串数值连续字符串

JieStr = "1,4,5,7,8,9,10,13,15,17,18,19,21,22,6,7,13";
      JieStrArr = JieStr.Split(",");
      JieStrArr=JieStrArr.Distinct().ToArray(); //去重
      Array.Sort(JieStrArr);  //排序，从小到大
      List<string> nstr = new List<string>();
      int i1 = 0;
      int j1 = 0;
      while (i1 < JieStrArr.Length - 1)
      {
          j1 = i1;
          while (i1 < JieStrArr.Length - 1 && JieStrArr[i1].Ext_ToInt() == (JieStrArr[i1 + 1].Ext_ToInt() - 1))
          {
              i1 = i1 + 1;
          }
          if (i1 != j1)
          {
              nstr.Add(JieStrArr[j1].Ext_IsDBNull() + '-' + JieStrArr[i1].Ext_IsDBNull());
          }
          i1++;
      }
     //Ext_IsDBNull() 转字符串方法   Ext_ToInt() 转int类型