如何從包含使用linq或包含日期和名稱的哈希集檢索日期？

Question

我是Web API的新手，需要代碼方面的幫助。

我想回到一個boolean如果傳遞的日期是GetHolidays上市假期或者是週六或週日

這是我的功能，我想檢查一個特定的日期是否是假期與否。

public bool IsHoliday(DateTime requesteddate) 
{ 
    HashSet<Holidays> holidays = new HashSet<Holidays>(); 
    string sat = requesteddate.DayOfWeek.ToString(); 
    string sun = requesteddate.DayOfWeek.ToString(); 

    holidays = GetHolidays(requesteddate.Year); 
    return true; 
} 

這是我算過了整整一年的假期HashSet的和完美的作品

public HashSet<Holidays> GetHolidays(int year) 
{ 
    HashSet<Holidays> holidays = new HashSet<Holidays>(); 

    // NEW YEARS 
    DateTime newYearsDate = AdjustForWeekendHoliday(new DateTime(year, 1, 1).Date); 
    holidays.Add(new Holidays(newYearsDate, "New Years Day")); 

    // MARTIN LUTHER KING, JR. DAY -- third Monday of January 
    DateTime martinLutherDay = new DateTime(year, 1, (from day in Enumerable.Range(1, 31) where new DateTime(year, 1, day).DayOfWeek == DayOfWeek.Monday select day).ElementAt(2)); 
    holidays.Add(new Holidays(martinLutherDay, "Martin Luther King, Jr. Day")); 

    // PRESIDENT'S DAY -- third Monday of February 
    DateTime presidentsDay = new DateTime(year, 2, (from day in Enumerable.Range(1, 29) where new DateTime(year, 2, day).DayOfWeek == DayOfWeek.Monday select day).ElementAt(2)); 
    holidays.Add(new Holidays(presidentsDay, "President's Day")); 

    // MEMORIAL DAY -- last monday in May 
    DateTime memorialDay = new DateTime(year, 5, 31); 
    DayOfWeek dayOfWeek = memorialDay.DayOfWeek; 

    while (dayOfWeek != DayOfWeek.Monday) 
    { 
     memorialDay = memorialDay.AddDays(-1); 
     dayOfWeek = memorialDay.DayOfWeek; 
    } 

    holidays.Add(new Holidays(memorialDay.Date, "Memorial Day")); 

    // INDEPENCENCE DAY 
    DateTime independenceDay = AdjustForWeekendHoliday(new DateTime(year, 7, 4).Date); 
    holidays.Add(new Holidays(independenceDay, "Independence Day")); 

    // LABOR DAY -- 1st Monday in September 
    DateTime laborDay = new DateTime(year, 9, 1); 
    dayOfWeek = laborDay.DayOfWeek; 

    while (dayOfWeek != DayOfWeek.Monday) 
    { 
     laborDay = laborDay.AddDays(1); 
     dayOfWeek = laborDay.DayOfWeek; 
    } 

    holidays.Add(new Holidays(laborDay.Date, "Labor Day")); 

    // VETERANS DAY 
    DateTime veteransDay = AdjustForWeekendHoliday(new DateTime(year, 11, 11).Date); 
    holidays.Add(new Holidays(veteransDay, "Veterans Day")); 

    // THANKSGIVING DAY - 4th Thursday in November 
    var thanksgiving = (from day in Enumerable.Range(1, 30) where new DateTime(year, 11, day).DayOfWeek == `DayOfWeek.Thursday select day).ElementAt(3); 
    DateTime thanksgivingDay = new DateTime(year, 11, thanksgiving); 
    holidays.Add(new Holidays(thanksgivingDay.Date, "Thanksgiving")); 

    // DAY AFTER THANKSGIVING DAY 
    DateTime dayAfterThankGiving = thanksgivingDay.AddDays(1); 
    holidays.Add(new Holidays(dayAfterThankGiving, "Day after Thanksgiving")); 

    // CHRISTMAS 
    DateTime christmasDay = AdjustForWeekendHoliday(new DateTime(year, 12, 25).Date, true); 
    holidays.Add(new Holidays(christmasDay, "Christmas")); 

    // CHRISTMAS EVE 
    DateTime christmasEve = christmasDay.AddDays(-1); 
    holidays.Add(new Holidays(christmasEve, "Christmas")); 

    return holidays; 
} 

這裏是在控制器IHTTP行動

[HttpGet] 
public IHttpActionResult IsHoliday(DateTime requesteddate) 
{ 
    try 
    { 
     var isHoliday = _dateService.IsHoliday(requesteddate); 
     return Content(HttpStatusCode.OK, isHoliday); 
    } 
    catch (Exception exception) 
    { 
     return BadRequest(exception.Message); 
    } 
} 

Answer 1

如果Holidays類實現GetHashCode和Equals僅僅通過比較班級的日期部分而不僅僅是檢查Contains將工作：

var isHoliday = holidays.Contains(new Holidays(requesteddate, "fake")); 

如果Holidays類沒有實現GetHashCode和Equals對所有（固定碼 - Why is it important to override GetHashCode when Equals method is overridden?）或類實際上比較了這兩種方法各領域比你需要通過全項手動迭代和比較日期：

var isHoliday = holidays.Contains(h => h.Date == requesteddate); 

我個人會用Dictionary<DateTime, Holiday>而不是HashSet，因爲它會更明顯，即查找按日期ContainsKey會發現，如果日期是收藏。

附註：Holidays是單項非常奇怪的名稱 - 通常複數名詞意味着收藏。

Answer 2

最後我得到了它這樣....但感謝幫助

public bool IsHoliday(DateTime requesteddate, HolidayType type) 
{ 
    var holidays = GetHolidays(requesteddate.Year, type); 
    return holidays.Any(h => DateTime.Equals(h.Date, requesteddate)); 
}