C# 根据天、周、月汇总统计生成统计报表

先看核心代码:

     public List 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.GroupBydynamic>(query.AsQueryable(), x => new { x.Date.Day });        
       //
注意根据周分组统计
      if (groupby.Equals("2"))
        groupBy
= DynamicQueryable.GroupBydynamic>(query.AsQueryable(), x => new { Week = x.Date.Date.GetWeekOfYear() });
      else if (groupby.Equals("3")) //注意根据月分组统计
        groupBy
= DynamicQueryable.GroupBydynamic>(query.AsQueryable(), x => new { x.Date.Month });

      query
= groupBy.Select(g => 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()还有GetWeekOfYear()方法

   public static class DynamicQueryable
    {        public static IQueryable> GroupBy        
             (IQueryable query, Expression> keySelector)
        {
              return query.GroupBy(keySelector);
        }
      
    

public static ObservableCollection ToObservableCollection(this IEnumerable col)
{
return new ObservableCollection(col);
}


}

public static class DateTimeExtension
{
public static int GetWeekOfYear(this DateTime dt)
{
GregorianCalendar calendar = new GregorianCalendar();
return calendar.GetWeekOfYear(dt, CalendarWeekRule.FirstDay, DayOfWeek.Monday);//注意这里一周是以星期一为第一天
}
}


前端图表显示使用插件:echarts 官网为:https://www.echartsjs.com/zh/index.html

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