89 lines
3.4 KiB
C#
89 lines
3.4 KiB
C#
|
using System;
|
|||
|
|
using System.ComponentModel;
|
|||
|
|
using System.Linq;
|
|||
|
|
|
|||
|
|
namespace JiShe.CollectBus.Common.Extensions
|
|||
|
|
{
|
|||
|
|
/// <summary>
|
|||
|
|
/// Extension methods for <see cref="DayOfWeekExtensions"/>.
|
|||
|
|
/// </summary>
|
|||
|
|
public static class DayOfWeekExtensions
|
|||
|
|
{
|
|||
|
|
/// <summary>
|
|||
|
|
/// Check if a given <see cref="DayOfWeek"/> value is weekend.
|
|||
|
|
/// </summary>
|
|||
|
|
[Description("检查给定值是否为周末")]
|
|||
|
|
public static bool IsWeekend(this DayOfWeek dayOfWeek)
|
|||
|
|
{
|
|||
|
|
return dayOfWeek.IsIn(DayOfWeek.Saturday, DayOfWeek.Sunday);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Check if a given <see cref="DayOfWeek"/> value is weekday.
|
|||
|
|
/// </summary>
|
|||
|
|
[Description("检查给定值是否为工作日")]
|
|||
|
|
public static bool IsWeekday(this DayOfWeek dayOfWeek)
|
|||
|
|
{
|
|||
|
|
return dayOfWeek.IsIn(DayOfWeek.Monday, DayOfWeek.Tuesday, DayOfWeek.Wednesday, DayOfWeek.Thursday, DayOfWeek.Friday);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Finds the NTH week day of a month.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="dayOfWeek">The day of week.</param>
|
|||
|
|
/// <param name="year">The year.</param>
|
|||
|
|
/// <param name="month">The month.</param>
|
|||
|
|
/// <param name="n">The nth instance.</param>
|
|||
|
|
/// <remarks>Compensates for 4th and 5th DayOfWeek of Month</remarks>
|
|||
|
|
[Description("查找一个月的第n周")]
|
|||
|
|
public static DateTime FindNthWeekDayOfMonth(this DayOfWeek dayOfWeek, int year, int month, int n)
|
|||
|
|
{
|
|||
|
|
if (n < 1 || n > 5)
|
|||
|
|
{
|
|||
|
|
throw new ArgumentOutOfRangeException(nameof(n));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
var y = 0;
|
|||
|
|
|
|||
|
|
var daysOfMonth = DateTimeExtensions.DaysOfMonth(year, month);
|
|||
|
|
|
|||
|
|
// compensate for "last DayOfWeek in month"
|
|||
|
|
var totalInstances = dayOfWeek.TotalInstancesInMonth(year, month);
|
|||
|
|
if (n == 5 && n > totalInstances)
|
|||
|
|
n = 4;
|
|||
|
|
|
|||
|
|
var foundDate = daysOfMonth
|
|||
|
|
.Where(date => dayOfWeek.Equals(date.DayOfWeek))
|
|||
|
|
.OrderBy(date => date)
|
|||
|
|
.Select(x => new { n = ++y, date = x })
|
|||
|
|
.Where(x => x.n.Equals(n)).Select(x => x.date).First(); //black magic wizardry
|
|||
|
|
|
|||
|
|
return foundDate;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Finds the total number of instances of a specific DayOfWeek in a month.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="dayOfWeek">The day of week.</param>
|
|||
|
|
/// <param name="year">The year.</param>
|
|||
|
|
/// <param name="month">The month.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
[Description("获取一个月内特定DayOfWeek的实例总数")]
|
|||
|
|
public static int TotalInstancesInMonth(this DayOfWeek dayOfWeek, int year, int month)
|
|||
|
|
{
|
|||
|
|
return DateTimeExtensions.DaysOfMonth(year, month).Count(date => dayOfWeek.Equals(date.DayOfWeek));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Gets the total number of instances of a specific DayOfWeek in a month.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="dayOfWeek">The day of week.</param>
|
|||
|
|
/// <param name="dateTime">The date in a month.</param>
|
|||
|
|
/// <returns></returns>
|
|||
|
|
[Description("获取一个月内特定DayOfWeek的实例总数")]
|
|||
|
|
public static int TotalInstancesInMonth(this DayOfWeek dayOfWeek, DateTime dateTime)
|
|||
|
|
{
|
|||
|
|
return dayOfWeek.TotalInstancesInMonth(dateTime.Year, dateTime.Month);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|