我正试图弄清楚如何使用Linq和C#计算星期一,星期二等的数量
以下是我的示例数据:
Status StatusDate
DELIVRD 2015-04-16 11:57:47.000
DELIVRD 2015-04-16 13:02:57.000
我知道我需要使用Group by将相同的星期一,星期二等分组为1。
我的尝试:
var mondays = rad.SMSSentItems
.Where(x => (x.StatusDate.Value.DayOfWeek == DayOfWeek.Monday)
&& (x.Status == "DELIVRD"))
.ToList()
.Count;
答案 0 :(得分:5)
您需要按所需状态(DELIVRD
)进行过滤,然后按状态日期DayOfWeek
对其进行分组
var weekDays = rad.SMSSentItems
.Where(x => x.Status == "DELIVRD")
.AsEnumerable()
.GroupBy(x => x.StatusDate.Value.DayOfWeek)
.Select(g => {
//Total items sent on this day of the week
var totalItemCount = g.Count();
//Total number if this distinct day of the week
var totalNumberOfDays = g.Select(x => x.StatusDate.Value.Date).Distinct().Count();
return new {
DayOfWeek = g.Key,
TotalItemCount = totalItemCount,
TotalNumberOfDays = totalNumberOfDays,
AverageItemPerDay = totalItemCount / totalNumberOfDays
};
})
.ToList();