Question

如何使用整数值确定星期几，使用另一个整数确定星期几？例如，如果今天是（为星期天输入一个类似0的整数），而我则输入整数2，则其为星期二。这是我到目前为止的代码：

namespace DayOfTheWeek
{
    class Program
    {
        static void Main(string[] args)
        {
            int Sunday=0;
            int Monday = 1;
            int Tuesday = 2;
            int Wednesday = 3;
            int Thursday = 4;
            int Friday = 5;
            int Saturday = 6;

            Console.WriteLine("Today is " + 0);
        }
    }
}

我真的很沮丧。

Answer 1

您可以为此使用数组：

string[] daysOfWeek = new string[] { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
int dayVal = 2;
if (dayVal >= 0 && dayVal < daysOfWeek.Length) // check it's within the bounds of the array, we don't want any IndexOutOfBounds exceptions being thrown for bad user input
{
    Console.WriteLine($"Today is {daysOfWeek[dayVal]}.")
}

或者，您可以使用字典：

Dictionary<int, string> daysOfWeek = new Dictionary<int, string>()
{
    { 0, "Sunday" },
    { 1, "Monday" },
    { 2, "Tuesday" },
    { 3, "Wednesday" },
    { 4, "Thursday" },
    { 5, "Friday" },
    { 6, "Saturday" }
};

int dayVal = 2;
if (daysOfWeek.TryGetValue(dayVal, out string dayName)) // check it's in the dictionary and retrieve the result
{
    Console.WriteLine($"Today is {dayName}.");
}

或者您可以创建一个枚举（由于.NET已经有这样的枚举，因此您无需在一周中的几天内使用该枚举）：

public enum DaysOfWeek
{
    Sunday = 0,
    Monday = 1,
    Tuesday = 2,
    Wednesday = 3,
    Thursday = 4,
    Friday = 5,
    Saturday = 6
}

int dayVal = 2;
if (Enum.IsDefined(typeof(DaysOfWeek), dayVal)) // check it's in the enum
{
    var dayOfWeek = (DaysOfWeek)dayVal;
    Console.WriteLine($"Today is {dayOfWeek}."); // this will print the name corresponding to the enum value
}

并改为使用内置的.NET DayOfWeek枚举：

int dayVal = 2;
if (Enum.IsDefined(typeof(DayOfWeek), dayVal)) // check it's in the enum
{
    var dayOfWeek = (DayOfWeek)dayVal;
    Console.WriteLine($"Today is {dayOfWeek}."); // this will print the name corresponding to the enum value
}

要确定一周的第二天，您应该使用以下代码：

int nextDay = dayVal == 6 ? 0 : dayVal + 1;

请注意以下一种替代方法：

DateTime today = DateTime.Now.Date;
Console.WriteLine($"Today is {today.DayOfWeek}.");
DateTime tomorrow = today.AddDays(1);
Console.WriteLine($"Tomorrow is {tomorrow.DayOfWeek}.");

如何使用整数值确定星期几，而另一个整数确定星期几？

1 个答案: