c# – 如何更改哪一天是一周的第一天？

(int)DateTime.Now.DayOfWeek

您不能影响DateTime.DayOfWeek的值,因为这是一种System.DayOfWeek,它是一个枚举(即值是常量). System.DayOfWeek的定义在下面的代码块中.所以,如果你想把DayOfWeek视为星期一和星期六的3是一周的第一天,那么我必须假设你想要一个基于1到7的编号系统.在这种情况下,你可以做(??(int)DateTime.Now.DayOfWeek 1)％7 1来获得你想要的数字.如果您不需要这个用于计算,最好只将DateTime.Now.DayOfWeek的值与其枚举常量进行比较(例如if(DateTime.Now.DayOfWeek == DayOfWeek.Monday)…).

// Summary:
//     Specifies the day of the week.
[Serializable]
[ComVisible(true)]
public enum DayOfWeek
{
    // Summary:
    //     Indicates Sunday.
    Sunday = 0,//
    // Summary:
    //     Indicates Monday.
    Monday = 1,//
    // Summary:
    //     Indicates Tuesday.
    Tuesday = 2,//
    // Summary:
    //     Indicates Wednesday.
    Wednesday = 3,//
    // Summary:
    //     Indicates Thursday.
    Thursday = 4,//
    // Summary:
    //     Indicates Friday.
    Friday = 5,//
    // Summary:
    //     Indicates Saturday.
    Saturday = 6,}