C＃：如何將開關與if語句組合？

Question

我需要結合一個if語句的開關。

我怎樣才能做到這一點？ 我想做這樣的事情：

switch (periodtype)
{
    if(starttime>endtime)
    {
        ;
    }
    else
    {
        case 0: nextRunTime = nextRunTime.AddHours(period); break;
        case 1: nextRunTime = nextRunTime.AddMinutes(period); break;
        case 2: nextRunTime = nextRunTime.AddSeconds(period); break;
    }
}

Answer 1

有什么問題：

if(starttime<=endtime)
{
    switch (periodtype)
    {
        case 0: nextRunTime = nextRunTime.AddHours(period); break;
        case 1: nextRunTime = nextRunTime.AddMinutes(period); break;
        case 2: nextRunTime = nextRunTime.AddSeconds(period); break;
    }
}

Answer 2

if(starttime>endtime)
{
    // Stuff
}
else
{
    switch (periodtype)
    {
        case 0: nextRunTime = nextRunTime.AddHours(period); break;
        case 1: nextRunTime = nextRunTime.AddMinutes(period); break
        case 2: nextRunTime = nextRunTime.AddSeconds(period); break;
    }
}

像那樣？

Answer 3

if(starttime>endtime)
{
    ;
}
else
{
   switch (periodtype)
   {
      case 0: nextRunTime = nextRunTime.AddHours(period); break;
      case 1: nextRunTime = nextRunTime.AddMinutes(period); break;
      case 2: nextRunTime = nextRunTime.AddSeconds(period); break;
   }
}

Answer 4

if(starttime <= endtime)
{
      switch (periodtype)
      {     
             case 0: nextRunTime = nextRunTime.AddHours(period); break;
             case 1: nextRunTime = nextRunTime.AddMinutes(period); break;
             case 2: nextRunTime = nextRunTime.AddSeconds(period); break;

       }
}

Answer 5

嗯，答案來不及了

這樣難道不是嗎：

if (starttime <= endtime)
{
    switch (periodtype)
    {   
        case 0: nextRunTime = nextRunTime.AddHours(period); break;
        case 1: nextRunTime = nextRunTime.AddMinutes(period); break;
        case 2: nextRunTime = nextRunTime.AddSeconds(period); break;
    }
}