C#函数输入年和周，返回周所在的开始日期和结束日期
public static string GetWeekRange(int year, int weekIndex)
{
if (weekIndex < 1)
{
throw new Exception("请输入大于0的整数");
}
int allDays = (weekIndex - 1) * 7;
//确定当年第一天
DateTime firstDate = new DateTime(year, 1, 1);
int firstDayOfWeek = (int)firstDate.DayOfWeek;
firstDayOfWeek = firstDayOfWeek == 0 ? 7 : firstDayOfWeek;
//周开始日
int startAddDays = allDays + (1 - firstDayOfWeek);
DateTime weekRangeStart = firstDate.AddDays(startAddDays);
//周结束日
int endAddDays = allDays + (7 - firstDayOfWeek);
DateTime weekRangeEnd = firstDate.AddDays(endAddDays);
if (weekRangeStart.Year > year || (weekRangeStart.Year == year && weekRangeEnd.Year > year))
{
throw new Exception("今年没有第" + weekIndex + "周。");
}
}
这个函数是输入年和周，我想返回weekRangeStart, weekRangeEnd这两个值，如何调用上面这个函数，请指点
[解决办法]
上面方法没有返回值。。
//周开始日
int startAddDays = allDays + (1 - firstDayOfWeek);
DateTime weekRangeStart = firstDate.AddDays(startAddDays);
//周结束日
int endAddDays = allDays + (7 - firstDayOfWeek);
DateTime weekRangeEnd = firstDate.AddDays(endAddDays);
return weekRangeStart.tostring()+" "+weekRangeEnd.tostring();
需要时直接调用这个GetWeekRange(2011,52)就可以了
返回值应该是：2011-12-25 2011-12-31
[解决办法]
这是我前几天一个项目里用到时写的。给分吧哥们。我这个很实用哟
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MEETOK.Components
{
public class ToolDate
{
/// <summary>
/// 周次转化为日期范围
/// </summary>
/// <param name="ParmYear">年</param>
/// <param name="ParmWeek">周次</param>
/// <returns></returns>
public static string WeekToDate(int ParmYear, int ParmWeek)
{
int year = ParmYear, yearStart, yearEnd, monthStart, monthEnd, dayStart, dayEnd, week = ParmWeek, sum = 0;
int[] days = new int[] { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int i;
sum += 7 * (week - 1);
//修正当前总天数
#region
switch (DateTime.Parse(year + "-1-1").DayOfWeek)
{
case DayOfWeek.Tuesday:
{
sum += 5;
break;
}
case DayOfWeek.Wednesday:
{
sum += 4;
break;
}
case DayOfWeek.Thursday:
{
sum += 3;
break;
}
case DayOfWeek.Friday:
{
sum += 2;
break;
}
case DayOfWeek.Saturday:
{
sum += 1;
break;
}
case DayOfWeek.Sunday:
{
//sum;
break;
}
default:
break;
}
#endregion
//判断2月天数
if ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0))
{
days[1] = 29;
}
//计算出当前是一年的第几天
for (i = 0; i < days.Length; i++)
{
if (sum >= days[i])
{
sum -= days[i];
}
else
{
break;
}
}
#region
yearStart = year;
monthStart = i + 1;
dayStart = sum + 1;
//修改开始日期
if (dayStart < 1)
{
dayStart += days[11];
monthStart = 12;
yearStart--;
}
yearEnd = yearStart;
monthEnd = monthStart;
dayEnd = dayStart + 6;
if (dayEnd > days[monthStart - 1])
{
dayEnd -= days[monthStart - 1];
monthEnd++;
if (monthEnd > 12)
{
monthEnd = 1;
yearEnd++;
}
}
#endregion
return yearStart + "." + monthStart + "." + dayStart + "-" + yearEnd + "." + monthEnd + "." + dayEnd;
}
/// <summary>
/// 返回月度范围
/// </summary>
/// <param name="ParYear">年</param>
/// <param name="ParMonth">月</param>
/// <returns></returns>
public static string MonthToDate(int ParYear, int ParMonth)
{
int[] days = new int[] { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
//判断2月天数
if ((ParYear % 400 == 0) || (ParYear % 4 == 0 && ParYear % 100 != 0))
{
days[1] = 29;
}
return ParYear + "." + ParMonth + ".1-" + ParYear + "." + ParMonth + "." + days[ParMonth - 1];
}
/// <summary>
/// 返回季度范围
/// </summary>
/// <param name="ParYear"></param>
/// <param name="Quarter"></param>
/// <returns></returns>
public static string QuarterToDate(string ParYear, int Quarter)
{
string[] QuarterToMonth = { ParYear + ".01.01-" + ParYear + ".03.31", ParYear + ".04.01-" + ParYear + ".06.30", ParYear + ".07.01-" + ParYear + ".09.30", ParYear + ".10.01-" + ParYear + ".12.31" };
return QuarterToMonth[Quarter - 1];
}
/// <summary>
/// 返回上下半年范围
/// </summary>
/// <param name="ParYear">年</param>
/// <param name="upOrDown">上/下 半年 0上半年，1下半年</param>
/// <returns></returns>
public static string YearToDate(string ParYear, int upOrDown)
{
string[] YearStatus = { ParYear + ".01.01-" + ParYear + ".06.30", ParYear + ".07.01-" + ParYear + ".12.31" };
return YearStatus[upOrDown];
}
}
}
