C#中如何根據月份來確定每月的最大天數

#region 根據月份來確定每月的最大天數       private int SetDate(string time)  {      int intYear;      int intMonth;      int intDay;                 string year = time.Substring(0,4);      string month = time.Substring(4,2);      int.TryParse(year, out intYear);      int.TryParse(month, out intMonth);      if (intMonth == 02)      {          if (intYear % 400 == 0 || (intYear % 4 == 0 && intYear % 100 != 0))//判斷是不是閏年            {              intDay = 29;          }          else        {              intDay = 28;          }      }      switch (intMonth)      {          case 04:          case 06:          case 09:          case 11: intDay = 30; break;          default: intDay = 31; break;      }      return intDay;  }  #endregion

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