切换 elseif 来切换 case

我们如何将下面的 if -else 语句切换为 switch case 语句..任何人都可以帮忙解决这个问题...

        if (Webcc1.Contains(licensePartID))
        {
             dtExpiryDate = dtActivatedDate.AddYears(1);
            int isExpiry = DateTime.Compare(dtActivatedDate, dtExpiryDate);
             if (isExpiry >= 0)
             {
                    setError(lblSystemErr, "This action cannot be performed. The subscription period of the license key has expired");
                    return;
              }
         }
        else if (Webcc3.Contains(licensePartID))
        {
           dtExpiryDate = dtActivatedDate.AddYears(3);
           int isExpiry = DateTime.Compare(dtActivatedDate, dtExpiryDate);
            if (isExpiry >= 0)
             {
                  setError(lblSystemErr, "This action cannot be performed. The subscription period of the license key has expired");
                   return;
             }
         }
         else if (Webcc5.Contains(licensePartID))
         {
            dtExpiryDate = dtActivatedDate.AddYears(5);
            int isExpiry = DateTime.Compare(dtActivatedDate, dtExpiryDate);
            if (isExpiry >= 0)
            {
               setError(lblSystemErr, "This action cannot be performed. The subscription period of the license key has expired");
               return;
             }
         }

提前谢谢了 ....

您不能直接执行此操作，但可以使用 按位运算 三元条件将 if...else if 转换为 switch 语句： 罢工>

var flags = (Webcc1.Contains(licensePartID)) ? 1 : 0;
flags |= (Webcc3.Contains(licensePartID)) ? 2 : 0;
flags |= (Webcc5.Contains(licensePartID)) ? 4 : 0;