错误：无法在 LINQ to Entities 查询 ASP.NET MVC3 中构造实体或复杂类型答案

【问题标题】：Error: The entity or complex type cannot be constructed in a LINQ to Entities query ASP.NET MVC3错误：无法在 LINQ to Entities 查询 ASP.NET MVC3 中构造实体或复杂类型
【发布时间】：2013-05-10 05:58:45
【问题描述】：

祝大家有美好的一天。

我有实体或复杂类型无法遇到这是我第一次遇到这种类型的错误有人帮助我

public IEnumerable<APPLICANT> GetApplicant()
{ 
    IEnumerable<APPLICANT> applicantdata = Cache.Get("applicants") as IEnumerable<APPLICANT>;

    IEnumerable<Profile> profiledata = Cache.Get("profiles") as IEnumerable<Profile>;




    if (applicantdata == null)
    {

        var applicantList = (from a in context.Profiles
                             join app in context.APPLICANTs 
                             on a.PROFILE_ID equals app.Profile_id
                            where app.APPLICANT_LogicalDelete == false
                            select new APPLICANT()
                             {
           APPLICANT_LastName = a.Applicant_LASTNAME,
           APPLICANT_FirstName = a.Applicant_FIRSTNAME,
           APPLICANT_MiddleName = a.Applicant_MIDDLENAME,
           APPLICANT_Address = a.Applicant_ADDRESS,
           APPLICANT_City = a.Applicant_CITY,
           APPLICANT_Phone = a.Applicant_PHONE,
            APPLICANT_Email= a.Applicant_EMAIL
       });

        applicantdata = applicantList.Where(v => !String.IsNullOrEmpty(v.APPLICANT_LastName)).OrderBy(v => v.APPLICANT_ID).ToList();

        if (applicantdata.Any())    
        {
            Cache.Set("applicants", applicantdata, 30);
        }
    }
    return applicantdata.ToList().Take(1000);

}

这是我遇到错误的行谢谢！

applicantdata = applicantList.Where(v => !String.IsNullOrEmpty(v.APPLICANT_LastName)).OrderBy(v => v.APPLICANT_ID).ToList();

上面一行的错误是

System.NotSupportedException：无法在 LINQ to Entities 查询中构造实体或复杂类型“Model.APPLICANT”。

【问题讨论】：

标签： entity-framework c#-3.0

【解决方案1】：

在我看来，您的查询正在构造注册为实体类型的类型的对象。您无需使用 select new{...} 来初始化此类对象。

尝试像这样更改您的查询：

var applicantList = (from a in context.Profiles
                         join app in context.APPLICANTs 
                         on a.PROFILE_ID equals app.Profile_id
                        where app.APPLICANT_LogicalDelete == false
                        select app
                 );
 ..........

【讨论】：