本文实例讲述了C#获取每个年,月,周的起始日期和结束日期的方法。分享给大家供大家参考，具体如下：
我们在写程序的时候往往要计算出年,月,周的开始日期和结束日期,在这里给出统一求解方法
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/// <summary>
/// 声明期间类型枚举
/// </summary>
public enum Period {Day, Week, Month, Year};
/// <summary>
/// 获取指定期间的起止日期
/// </summary>
/// <param name="period">期间类型</param>
/// <param name="beginDate">开始日期</param>
/// <param name="endDate">结束日期</param>
public static void GetPeriod(Period period, out DateTime beginDate, out DateTime endDate)
{
int year = DateTime.Today.Year;
int month = DateTime.Today.Month;
switch (period)
{
case Period.Year: //年
beginDate = new DateTime(year, 1, 1);
endDate = new DateTime(year, 12, 31);
break;
case Period.Month: //月
beginDate = new DateTime(year, month, 1);
endDate = beginDate.AddMonths(1).AddDays(-1);
break;
case Period.Week: //周
int week = (int)DateTime.Today.DayOfWeek;
if (week == 0) week = 7; //周日
beginDate = DateTime.Today.AddDays(-(week - 1));
endDate = beginDate.AddDays(6);
break;
default: //日
beginDate = DateTime.Today;
endDate = DateTime.Today;
break;
}
}
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希望本文所述对大家C#程序设计有所帮助。