Question

Aries          March 21 to April 20.
Taurus         April 21 to May 20.
Gemini         May 21 to June 21.

我需要通过将用户的出生月份和日期作为输入来打印用户的占星符号。我如何获得日期范围？

EX：3月21日至4月20日

Answer 1

您实际上不需要构建日期时间范围来解决此问题。一个基于月份的简单switch语句，每个月都有一个简单的if语句，返回两个星号中的一个就足够了。

   e.g
     switch (month)
     {
       case 1:
          if (day <20) return "Capricorn"; else return "Aquarius";
          break;
       case 2:
          ...

Answer 2

这是方法的实现：

    private string GetHoroName(DateTime dt)
    {
        int month = dt.Month;
        int day = dt.Day;
        switch (month)
        {
            case 1:
                if (day <= 19)
                    return "Capricorn";
                else
                    return "Aquarius";

            case 2:
                if (day <= 18)
                    return "Aquarius";
                else
                    return "Pisces";
            case 3:
                if (day <= 20)
                    return "Pisces";
                else
                    return "Aries";
            case 4:
                if (day <= 19)
                    return "Aries";
                else
                    return "Taurus";
            case 5:
                if (day <= 20)
                    return "Taurus";
                else
                    return "Gemini";
            case 6:
                if (day <= 20)
                    return "Gemini";
                else
                    return "Cancer";
            case 7:
                if (day <= 22)
                    return "Cancer";
                else
                    return "Leo";
            case 8:
                if (day <= 22)
                    return "Leo";
                else
                    return "Virgo";
            case 9:
                if (day <= 22)
                    return "Virgo";
                else
                    return "Libra";
            case 10:
                if (day <= 22)
                    return "Libra";
                else
                    return "Scorpio";
            case 11:
                if (day <= 21)
                    return "Scorpio";
                else
                    return "Sagittarius";
            case 12:
                if (day <= 21)
                    return "Sagittarius";
                else
                    return "Capricorn";
        }
        return "";
    }

Answer 3

创建一个描述星座的类......

class StarSign
{
    public string Name {get;set;}

    public DateTime StartDate {get;set;}

    public DateTime EndDate {get;set;}

    public bool CoversDate(DateTime birthday)
    {
        return birthday <= this.EndDate && birthday >= this.StartDate;
    }
}

Answer 4

我知道我错过了获得接受答案的船，但在给予Kirk Broadhurst抨击之后，我认为我最好提供自己的答案。

我对这个问题的解读是chamara想要这样的事情：

var birthDate = new DateTime(1923, 4, 20);
var starSign = StarSigns.GetFor(birthDate);

Console.WriteLine(starSign); // Taurus (April 20 - May 20)
Console.WriteLine(starSign.GetStartDate(2010)); // 2010/04/20 00:00:00
Console.WriteLine(starSign.GetEndDate(2010)); // 2010/05/20 23:59:59

var starSign1 = StarSigns.GetFor(10, 22);
var starSign2 = StarSigns.GetFor(10, 23);

Console.WriteLine(starSign1); // Libra (September 23 - October 22)
Console.WriteLine(starSign2); // Scorpio (October 23 - November 21)

所以这是我的课程：

public static class StarSigns
{
    private static StarSign[] _starSigns;

    static StarSigns()
    {
        var names = new[]
        {
            "Aquarius", "Pisces", "Aries", "Taurus",
            "Gemini", "Cancer", "Leo", "Virgo",
            "Libra", "Scorpio", "Sagittarius", "Capricorn", 
        };

        var days = new[]
        {
            20, 18, 20, 20,
            21, 21, 22, 23,
            23, 23, 22, 22,
        };

        _starSigns = (from i in Enumerable.Range(0, 12)
                      let name = names[i]
                      let startMonth = i + 1
                      let startDay = days[i]
                      let endDay = days[(i + 1) % 12] - 1
                      select new StarSign(name, startMonth, startDay, endDay)).ToArray();
    }

    public static StarSign GetFor(DateTime birthDate)
    {
        return (from starSign in _starSigns
                let startDate = starSign.GetStartDate(birthDate.Year)
                let endDate = starSign.GetEndDate(birthDate.Year)
                where startDate <= birthDate
                where endDate >= birthDate
                select starSign).Single();
    }

    public static StarSign GetFor(int birthMonth, int birthDay)
    {
        return GetFor(new DateTime(2010, birthMonth, birthDay));
    }

}

public class StarSign
{
    public StarSign(string name, int startMonth, int startDay, int endDay)
    {
        this.Name = name;
        this.StartMonth = startMonth;
        this.StartDay = startDay;
        this.EndDay = endDay;
    }

    public string Name { get; private set; }

    public int StartDay { get; private set; }
    public int EndDay { get; private set; }

    public int StartMonth { get; private set; }

    public int EndMonth
    {
        get
        {
            return this.StartMonth + 1;
        }
    }

    public DateTime GetStartDate(int year)
    {
        return new DateTime(year, this.StartMonth, this.StartDay);
    }

    public DateTime GetEndDate(int year)
    {
        var nextStart = new DateTime(year, (this.StartMonth % 12) + 1, this.EndDay + 1);
        return nextStart.Subtract(TimeSpan.FromTicks(1));
    }

    public string Period
    {
        get
        {
            var startDate = this.GetStartDate(2010);
            var endDate = this.GetEndDate(2010);
            var template = "{0:MMMM dd} - {1:MMMM dd}";
            return String.Format(template, startDate, endDate);
        }
    }

    public override string ToString()
    {
        return String.Format("{0} ({1})", this.Name, this.Period);
    }
}

享受！

Answer 5

没有测试过，但它看起来正确......：）

    private static string GetStarSign(DateTime dateOfBirth)
    {
        int[] fromDate = { 21, 20, 21, 21, 22, 22, 23, 23, 22, 23, 22, 22 };
        string[] signs = { "Capricorn", "Aquarius", "Pisces", "Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo", "Libra", "Scorpio", "Sagittarius", "Capricorn" };
        if (dateOfBirth.Day < fromDate[dateOfBirth.Month - 1])
            return signs[dateOfBirth.Month - 1];
        return signs[dateOfBirth.Month];
    }

确定DateTime是否在给定的日期范围内

5 个答案: