實體框架/ linq查詢問題

Question

所以我試圖解決我的Silverlight報告應用程序中缺乏存儲過程支持，並且我的linq有點麻煩。

我有一個存儲過程，看起來像這樣：

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 

我已經創建瞭如下的DomainService類，這樣我可以使用實體框架查詢這一天。我想我的查詢的結果推到我的自定義數據結構監守我沒有說有，我需要爲我的報告中所有信息的實體（特別是訪問和引用）

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; 
     } 

    } 
} 

這是我得到的錯誤：

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 }; 

錯誤：

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 

我得到這個錯誤的訪問，自定義，前景，遊客，referrer和ReferrerID。

任何幫助，將不勝感激= d

Answer 1

Referrer.Referrer1是什麼類型的？從錯誤，這聽起來像你的組密鑰是string。

我想你想要做的是通過組合鍵組：

group referrer by new { ID = referrerName.ReferrerID, Name = referrerName.Referrer1 } 

，然後選擇這樣的：

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 } 

Answer 2

在你的類屬性你有Customer單數和在LINQ你有Customers複數。

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; } 

}