DateTime.DayOfWeek的一个问题

Question

DateTime.DayOfWeek.ToString()的返回值是(Monday,Tuesday......Sunday)
有没有什么方法可以返回(0,1,2,3......)?

Answer 1

可以用select case
没有试过其他的方法

Answer 2

public int GetWeekNum (string strData)
{
string strDayOfWeek  = Convert.ToDateTime(strData).DayOfWeek.ToString();
int intWeekday = -1;
switch (strDayOfWeek) 
{
case "Monday":
intWeekday = 1;
break;
case "Tuesday":
intWeekday = 2;
break;
case "Wednesday":
intWeekday = 3;
break;
case "Thursday":
intWeekday = 4;
break;
case "Friday":
intWeekday = 5;
break;
case "Saturday":
intWeekday = 6;
break;
case "Sunday":
intWeekday = 7;
break;
default:
intWeekday = -1;
break;
} 
return intWeekday;
}

Answer 3

直接进行类型转换就可以
int tmp = Convert.ToInt32(DateTime.DayOfWeek(DateTime.Now));

Answer 4

int d = (int)DateTime.DayOfWeek;