C# 计算时间段的方法-strFlag为自定义的字符串标识

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String strFlag = radioGroupTime.EditValue.ToString(); //获取标识

switch (strFlag)

{

case "LastWeek":

dtStart = DateTime.Now.AddDays(1 - 7 - ((int)DateTime.Now.DayOfWeek == 0/*此处因为周末在我的系统内作为周的第一天，所以做了特殊处理*/ ? 7 : (int)DateTime.Now.DayOfWeek)).Date;

dtEnd = dtStart.AddDays(7).AddMilliseconds(-1);

break;

case "ThisWeek":

dtStart = DateTime.Now.AddDays(1 - ((int)DateTime.Now.DayOfWeek == 0 ? 7 : (int)DateTime.Now.DayOfWeek)).Date;

dtEnd = dtStart.AddDays(7).AddMilliseconds(-1);

break;

case "NextWeek":

dtStart = DateTime.Now.AddDays(1 + 7 - ((int)DateTime.Now.DayOfWeek == 0 ? 7 : (int)DateTime.Now.DayOfWeek)).Date;

dtEnd = dtStart.AddDays(7).AddMilliseconds(-1);

break;

case "LastMonth":

dtStart = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1).AddMonths(-1);

dtEnd = dtStart.AddMonths(1).AddMilliseconds(-1);

break;

case "ThisMonth":

dtStart = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1);

dtEnd = dtStart.AddMonths(1).AddMilliseconds(-1);

break;

case "NextMonth":

dtStart = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1).AddMonths(1);

dtEnd = dtStart.AddMonths(1).AddMilliseconds(-1);

break;

case "Custom":

dtStart = dateEditStart.DateTime.Date;

dtEnd = dateEditEnd.DateTime.Date.AddDays(1).AddMilliseconds(-1);

break;

default: break;

}

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