直接上代码：
int dayinweek = 0;
string week = datetime.today.dayofweek.tostring();
#region 获取dayinweek值
switch (week)
{
case "monday":
dayinweek = 1;
break;
case "tuesday":
dayinweek = 2;
break;
case "wednesday":
dayinweek = 3;
break;
case "thursday":
dayinweek = 4;
break;
case "friday":
dayinweek = 5;
break;
case "saturday":
dayinweek = 6;
break;
case "sunday":
dayinweek = 7;
break;
}
