[英]entity framework / linq query problem
因此,我试图解决我的Silverlight报表应用程序中缺少存储过程支持的问题,而我对linq有点麻烦。
我有一个看起来像这样的存储过程:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: Some Dev Guy
-- Create date: 11/02/10
-- =============================================
Alter PROCEDURE spGetTopReferers
@p_sitekey SmallInt,
@p_startDate SmallDateTime,
@p_endDate SmallDateTime
AS
BEGIN
SET NOCOUNT ON;
SELECT
TOP 10
SUM(DaySummaryReferrers.Visits) AS Visits,
SUM(DaySummaryReferrers.NewVisitors) AS 'New Visitors',
SUM(DaySummaryReferrers.Prospects) AS Prospects,
SUM(DaySummaryReferrers.Customers) AS Customers,
Referrers.Referrer
FROM
DaySummaryReferrers
LEFT OUTER JOIN
Referrers
ON
DaySummaryReferrers.ReferrerID = Referrers.ReferrerID
Where
DaySummaryReferrers.SiteKey = @p_sitekey
AND
DaySummaryReferrers.Dated
Between
@p_startDate
AND
@p_endDate
GROUP BY
Referrers.Referrer
ORDER BY
Visits DESC;
END
GO
我创建了以下DomainService类,以便今天可以使用实体框架进行查询。 我想将查询结果推入自定义数据结构中,因为我没有一个实体,该实体拥有我的报告(特别是访问和引荐来源)所需的所有信息
namespace Reports.Web.Services
{
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.ServiceModel.DomainServices.Hosting;
using System.ServiceModel.DomainServices.Server;
using System.Data;
using System.Data.Objects;
public class TopReferers
{
[Key]
[Editable(false)]
public int reffererID { get; set; }
public int? Visits { get; set; }
public int? Visitors { get; set; }
public int? Prospects { get; set; }
public int? Customer { get; set; }
public String Referrer { get; set; }
}
[EnableClientAccess()]
public class WebReportAggregateService : DomainService
{
WhosOnV5DevEntities ctx = new WhosOnV5DevEntities();
public IQueryable<TopReferers> GetTopReferrers()
{
DateTime p_start = new DateTime(2010, 01, 01);
DateTime p_end = new DateTime(2010, 11, 01);
ObjectSet<DaySummaryReferrer> myReferrers = ctx.DaySummaryReferrers;
ObjectSet<Referrer> myReferrerNames = ctx.Referrers;
IQueryable<TopReferers> x = from referrer in myReferrers.Take(10)
join referrerName in myReferrerNames
on referrer.ReferrerID
equals referrerName.ReferrerID
where
referrer.SiteKey == 74
&&
referrer.Dated >= p_start
&&
referrer.Dated <= p_end
group referrer by referrerName.Referrer1 into g
select new TopReferers { Visits = g.Key.Visits, Customer = g.Key.Customers, Prospects = g.Key.Prospects, Visitors = g.Key.NewVisitors, Referrer = g.Key.Referrer, reffererID = g.Key.ReferrerID };
return x;
}
}
}
这是我得到错误的地方:
select new TopReferers { Visits = g.Key.Visits, Customer = g.Key.Customers, Prospects = g.Key.Prospects, Visitors = g.Key.NewVisitors, Referrer = g.Key.Referrer, reffererID = g.Key.ReferrerID };
错误:
Error 2 'string' does not contain a definition for 'Customers' and no extension method 'Customers' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?) C:\Users\User\documents\visual studio 2010\Projects\Reports\Reports.Web\Services\WebReportAggregateService.cs 53 108 Reports.Web
对于“访问”,“自定义”,“潜在客户”,“访问者”,“引荐来源”和“ RefererID”,我收到此错误。
任何帮助将不胜感激= D
在类属性中,您具有“ Customer
单数,而在LINQ中,您具有“ Customers
复数。
public class TopReferers
{
[Key]
[Editable(false)]
public int reffererID { get; set; }
public int? Visits { get; set; }
public int? Visitors { get; set; }
public int? Prospects { get; set; }
public int? **Customer** { get; set; }
public String Referrer { get; set; }
}
Referrer.Referrer1
是什么类型? 从错误中看来,您的组密钥是string
。
我认为您要按组合键分组:
group referrer by new { ID = referrerName.ReferrerID, Name = referrerName.Referrer1 }
然后选择:
select new TopReferers { referrerID = g.Key.ID,
Visits = g.Sum(x => x.Visits),
Visitors = g.Sum(x => x.NewVisitors),
Prospects = g.Sum(x => x.Prospects),
Customer = g.Sum(x => x.Customers),
Referrer = g.Key.Name }
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