根据传递的参数在C#中查找日期 [英] find date in c# based on passed parameters

问题描述

以年份为整数，即2012年，以月份为文本，即"january"
如何找到上个月的最后一个星期一?
谢谢

Hi,
given the year as int i.e. 2012 and the month as text i.e. "january"
how do I find the last monday of the previous month?
Thanks

推荐答案

类似这样的东西:

Something like this:

FindDate(2012, "January", DayOfWeek.Monday);

public static DateTime FindDate(int year, string month, DayOfWeek day)
       {
           DateTime lastDay = new DateTime(year, DateTime.ParseExact(month, "MMMM", CultureInfo.CurrentCulture).Month, 1).AddMonths(1).AddDays(-1);
           DayOfWeek lastDow = lastDay.DayOfWeek;
           int diff = day - lastDow;

           return lastDay.AddDays(diff).Date;
       }

以下代码可用于查找所需的上个月的最后一天

The following code can be used to find required last day of the previous month

void Main()
{
    DateTime date = LastDayOfPreviousMonth(2012, "January", DayOfWeek.Monday);
    Console.WriteLine (date);
    
    //date
    //26/12/2011
}
    
public DateTime LastDayOfPreviousMonth(int year, string month, DayOfWeek dayOfWeek){
    int monthNo = Array.IndexOf(System.Globalization.CultureInfo
			.InvariantCulture.DateTimeFormat.MonthNames, month)+1;
    DateTime lastDateOfPrevMonth = new DateTime(year, monthNo,1).AddDays(-1);
    							 
    return lastDateOfPrevMonth.AddDays(lastDateOfPrevMonth.DayOfWeek < dayOfWeek ? 
    			dayOfWeek - lastDateOfPrevMonth.DayOfWeek -  7 : 
    			dayOfWeek - lastDateOfPrevMonth.DayOfWeek);
}

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