介绍 using 系统;
using System.Collections.Generic;
using System.Globalization;
using 来;
using 包含;
using System.Threading.Tasks;
namespace ConsoleApplication6
{
class 才能;程序
{才能
,,,static void Main (string [], args)
,,,{
,,,,,GregorianCalendar gc =, new GregorianCalendar ();
,,,,,int weekOfYear =, gc.GetWeekOfYear (DateTime.Now, CalendarWeekRule.FirstDay,, DayOfWeek.Monday);
,,,,,Console.WriteLine(“当前第{0}周“,,weekOfYear);
,,,,,DateTime startDate可以,,lastDate;
,,,,,for (int 小姐:=,1;,小姐:& lt;=, 53;,我+ +)
,,,,,{
,,,,,,,GetDaysOfWeeks (DateTime.Now.Year,,我,,out startDate可以,,out lastDate);
,,,,,,,Console.WriteLine(“第{0}周“,,i);
,,,,,,,Console.WriteLine (startDate可以);
,,,,,,,Console.WriteLine (lastDate);
,,,,,}
,,,,,Console.ReadLine ();
,,,}
,,,public static bool GetDaysOfWeeks (int ,, int 指数,out DateTime 首先,out DateTime 最后)
,,,{
,,,,,first =, DateTime.MinValue;
,,,,,last =, DateTime.MinValue;
,,,,,if (year & lt;, 1700, | |, year 祝辞,9999)
,,,,,{
,,,,,,,//澳攴莩蕖?
,,,,,,,return 假;
,,,,,}
,,,,,if (index & lt;, 1, | |, index 祝辞,53)
,,,,,{
,,,,,,,//爸苁砦蟆?
,,,,,,,return 假;
,,,,,}
,,,,,DateTime startDay =, new DateTime(,, 1, 1),,//该年第一天
,,,,,DateTime endDay =, new DateTime (year +, - 1, 1, 1) .AddMilliseconds (1);
,,,,,int dayOfWeek =, 0;
,,,,,if (Convert.ToInt32 (startDay.DayOfWeek.ToString (“d")),祝辞,0)
,,,,,,,dayOfWeek =, Convert.ToInt32 (startDay.DayOfWeek.ToString (“d")),,//该年第一天为星期几
,,,,,if (dayOfWeek ==, 0), {, dayOfWeek =, 7,,}
,,,,,if (==index 1)
,,,,,{
,,,,,,,first =, startDay.AddDays(7,安康;dayOfWeek 作用;6);
,,,,,,,if (==dayOfWeek 6)
,,,,,,,{
,,,,,,,,,last =,第一;
,,,,,,,}
,,,,,,,
,,,,,,,{
,,,,,,,,,last =, startDay.AddDays((7,安康;dayOfWeek));
,,,,,,,}
,,,,,}
,,,,,
,,,,,{
,,,,,,,first =, startDay.AddDays((8,安康;dayOfWeek), +, (index 安康;2),*,7);,//指数周的起始日期
,,,,,,,last =, first.AddDays (6);
,,,,,,,//if (last 祝辞,endDay)
,,,,,,,//{
,,,,,,,//,,last =, endDay;
,,,,,,,//}
,,,,,}
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这篇文章主要介绍了c#如何获取当前年份的周期及周期所在日期范围,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获、下面让小编带着大家一起了解一下。
最近有一个项目要用到年份周期,用于数据统计图表展示使用,当中用到年份周期,以及年份周期所在的日期范围。当初设想通过已知数据来换算年份周期,经过搜索资料发现通过数据库SQL语句来做,反而更加复杂。现在改变思路通过c#后台代码来算出两段日期范围中年份周期,在依据年份周期所对应的日期范围进行数据库查询进行统计。需要解决以下两个点问题,
第一点:依据日期查找所在年份的第几周;
第二点:依据年份所在的周期计算出周期所在的日期范围。
