Look at the core code:
public List<DataEntity> SearchShopSalesReport(DateTimeOffset? dateFrom, DateTimeOffset? dateTo,string groupBy)
{ var query = data.DataEntity //这里data为DbContext .AsEnumerable(); if (dateFrom.HasValue) query = query.Where(x => x.Date >= dateFrom); if (dateTo.HasValue) query = query.Where(x => x.Date <= dateTo);
//注意根据天分组统计 var groupBy = DynamicQueryable.GroupBy<DataEntity, dynamic>(query.AsQueryable(), x => new new {x.Date.Day});
// NOTE The circumferential packet statistics IF (groupby.Equals ( " 2 " )) groupBy = DynamicQueryable.GroupBy <DataEntity, Dynamic > (query.AsQueryable (), X => new new { = Week x.Date.Date.GetWeekOfYear ()}); the else IF (groupby.Equals ( " . 3 " )) // NOTE The group statistics month groupBy = DynamicQueryable.GroupBy <DataEntity, Dynamic > (query.AsQueryable (), = X> new new {x.Date.Month}); Query = groupBy.Select (G => new new
DataEntity {
ShopId = g.FirstOrDefault().ShopId,
MarketplaceId = g.FirstOrDefault().MarketplaceId,
Date = g.FirstOrDefault().Date,
Sessions = g.Sum(x => x.Sessions),
BoxPercentage = g.Average(x => x.BuyBoxPercentage)
}).ToObservableCollection();
return query.ToList();
DynamicQueryable.GroupBy()与ToObservableCollection()
public static class DynamicQueryable { public static IQueryable<IGrouping<TKey, TSource>> GroupBy<TSource, TKey> (IQueryable<TSource> query, Expression<Func<TSource, TKey>> keySelector) { return query.GroupBy(keySelector); }
public static ObservableCollection<T> ToObservableCollection<T>(this IEnumerable<T> col)
{
return new ObservableCollection<T>(col);
}
}