PagedList在MVC3與IQueryable的

我不明白我在做什麼錯。每當我得到這個錯誤：PagedList在MVC3與IQueryable的

實體或複雜類型「BusinessLogic.CompanyWithDivisionCount」不能在LINQ到實體查詢構造。

我需要從「公司」各公司從「司」表的表和部門計數的信息，然後進行PagedList。這是我的 '公司' 表：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.ComponentModel.DataAnnotations; 

using BusinessLogic.Services; 
using BusinessLogic.Models.ValidationAttributes; 

namespace BusinessLogic.Models 
{ 
    public class Company 
    { 
     public Company() 
     { 
      Country = "US"; 
      Status = true; 
     } 

     public int Id { get; set; } 

     [Required] 
     [UniqueCompanyName] 
     public string Name { get; set; } 

     public string Street { get; set; } 
     public string City { get; set; } 
     public string State { get; set; } 
     public int Zip { get; set; } 
     public string Country { get; set; } 

     public string ContactInfo { get; set; } 

     [Required] 
     public DateTime EffectiveDate { get; set; } 
     public DateTime TerminationDate { get; set; } 

     public bool Status { get; set; } 

     [Required] 
     public string URL { get; set; } 
     public string EAP { get; set; } 

     public string EAPCredentials { get; set; } 

     public string BrandingColors { get; set; } 

     public string Comments { get; set; } 
    } 
}

這裏是我的域模型：

public class Company 
{ 
    public Company() 
    { 
     Country = "US"; 
     Status = true; 
    } 

    public int Id { get; set; } 

    [Required] 
    [UniqueCompanyName] 
    public string Name { get; set; } 

    public string Street { get; set; } 
    public string City { get; set; } 
    public string State { get; set; } 
    public int Zip { get; set; } 
    public string Country { get; set; } 

    public string ContactInfo { get; set; } 

    [Required] 
    public DateTime EffectiveDate { get; set; } 
    public DateTime TerminationDate { get; set; } 

    public bool Status { get; set; } 

    [Required] 
    public string URL { get; set; } 
    public string EAP { get; set; } 

    public string EAPCredentials { get; set; } 

    public string BrandingColors { get; set; } 

    public string Comments { get; set; } 
} 

public class CompanyWithDivisionCount: Company // I'm using this 
{ 
    public int DivisionCount { get; set; } 
}

這裏是我的控制器：

public ActionResult CompaniesList(int? page) 
{ 
    var pageNumber = page ?? 1; 

    var companies = companyService.GetCompaniesWithDivisionsCount2(); 

    var model = companies.ToPagedList(pageNumber, PageSize); 

    return View(model); 
}

這裏是我的服務部分：

public IQueryable<CompanyWithDivisionCount> GetCompaniesWithDivisionsCount2() 
{ 
    return (from c in dataContext.Companies.AsQueryable() 
      select new CompanyWithDivisionCount 
      { 
       Id = c.Id, 
       Name = c.Name, 
       Status = c.Status, 
       EffectiveDate = c.EffectiveDate, 
       URL = c.URL, 
       EAP = c.EAP, 
       EAPCredentials = c.EAPCredentials, 
       Comments = c.Comments, 
       DivisionCount = (int)dataContext.Divisions.Where(b => b.CompanyName == c.Name).Count() 
      }); 
}

}

感謝您的幫助！

來源

2012-08-09 user1545035

'編譯時錯誤'或'運行時錯誤'？ – Yasser 2012-08-09 09:02:57

只有運行時錯誤 – user1545035 2012-08-09 09:41:24

我會考慮是否可能改變你的數據模型，使而不是按名稱串與公司分部，而不是使用兩個對象之間的正確維護外鍵關係（部門應該包含CompanyID外鍵）。這有很多好處（包括性能和數據完整性），如果您需要對應用程序進行進一步更改（或者任何公司決定重新命名它的名稱），幾乎肯定會讓您的工作更輕鬆地向前邁進。

如果你創建一個正確的外鍵關係，然後你的域模型可能看起來像

public class Company 
{ 
    ... 

    public virtual ICollection<Division> Divisions{ get; set; } 

    public int DivisionCount 
    { 
     get 
     { 
       return this.Divisions.Count() 
     } 
    } 

    ... 
}

來源

2012-08-09 09:33:54 AlexC

造物主PagedList這裏。這與PagedList無關，而是一個實體框架問題（我不是Entity Framework的專家，所以不能幫助你）。要確認這是真的，請按照以下幾行編寫單元測試：

[Test] 
public void ShouldNotThrowAnException() 
{ 
    //arrange 
    var companies = companyService.GetCompaniesWithDivisionsCount2(); 

    //act 
    var result = companies.ToList(); 

    //assert 
    //if this line is reached, we win! no exception on call to .ToList() 
}

來源

2012-08-09 12:03:45 Troy

PagedList在MVC3與IQueryable的

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