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我是初學者用MVC5編程。我正在使用MVC5和Entity框架6.我有一些相關的類,我使用第一種代碼方法。 之前澄清的關係我可以添加控制器沒有任何問題,但在那之後我有問題,例如看到這個圖片我不能在mvc dd控制器:序列不包含匹配的元素

add controller

error

這是我的代碼: location.cs

namespace NezamBarghLorestan.Models 
{ 
[Table("TblLocation")] 
public class Location 
{ 
    [Key] 
    public int ID { get; set; } 
    [Required] 
    [DisplayName("کشور")] 
    public string Country { get; set; } 
    [Required] 
    [DisplayName("استان")] 
    public string State { get; set; } 
    [Required] 
    [DisplayName("شهر")] 
    public string City { get; set; } 
    [DisplayName("منطقه")] 
    public string Zone { get; set; } 
    public virtual ICollection<Expert> experts{ get; set; } 


} 

}

and expert.cs

[Table("TblExpert")] 
public class Expert:Person 
{ 
    [Required] 
    [DisplayName("کد عضویت")] 
    public string EnCode { get; set; } //شماره عضویت 
    [Required] 
    [DisplayName("شماره پروانه")] 
    public string LicenseNo { get; set; }//شماره پروانه 
    [Required] 
    [DisplayName("تاریخ اولین صدور پروانه")] 
    [DataType(DataType.Date)] 
    [DisplayFormat(DataFormatString = "{yyyy/MM/dd}", ApplyFormatInEditMode = true)] 
    [Column(TypeName = "datetime2")] 
    public DateTime? LicenseNoStart { get; set; } 
    [Required] 
    [DisplayName("تاریخ انقضای آخرین پروانه")] 
    [DataType(DataType.Date)] 
    [DisplayFormat(DataFormatString = "{yyyy/MM/dd}", ApplyFormatInEditMode = true)] 
    [Column(TypeName = "datetime2")] 
    public DateTime? LicenseNoEnd { get; set; } 
    [DisplayName("پایه طراحی")] 
    public Grade DesGrade { get; set; } 
    [Required] 
    [DisplayName("پایه نظارت")] 
    public Grade SupervisGrade { get; set; } 
    [DisplayName("امتیاز مثبت سالانه")] 
    public long Score { get; set; } //امتیاز مثبت سالانه 
    [DisplayName("امتیاز منفی سالانه")] 
    public int? NegScore { get; set; }//امتیاز منفی 
    [DataType(DataType.Password)] 

    [DisplayName("کلمه عبور")] 
    public string password { get; set; } 
    [DisplayName("شهر حوزه فعالیت ")] 
    public LorestanCity CityWork { get; set; } 
    [DisplayName("شهر محل صدور")] 
    public int? CityId { get; set; } 
    public virtual ICollection<ExpertsHistory> expertshistory { get; set; } 
    public virtual ICollection<Building> buildings { get; set; } 
    [ForeignKey("CityId")] 
    public virtual Location location { get; set; } 

} 

和數據訪問層

public class NezamBarghDAL:DbContext 
{ 
    protected override void OnModelCreating(DbModelBuilder modelBuilder) 
    { 

     modelBuilder.Conventions.Remove<PluralizingTableNameConvention>(); 
     modelBuilder.Entity<Expert>().HasOptional<Location>(s => s.location) 
      .WithMany(s => s.experts).HasForeignKey(s => s.CityId); 


    } 
    public DbSet<Person> people { get; set; } 
    public DbSet<Expert> Experts { get; set; } 
    public DbSet<Facility> Facilitys { get; set; } 
    public DbSet<Manager> Managers { get; set; } 
    public DbSet<Owner> Owners { get; set; } 
    public DbSet<Location> locations { get; set; } 
    public DbSet<BuildingGroup> buildingGroups { get; set; } 
    public DbSet<FieldOfStudy> fieldOfStudies { get; set; } 
    public DbSet<Building> buidings { get; set; } 
    public DbSet<ExpertsHistory> expertHistories { get; set; } 


} 

在此之後進行測試我刪除從階級關係,我添加CONTROLER沒有任何問題,並就回國了關係類,但跑項目,打開鏈接後,控制器我得到這個錯誤: 序列中沒有匹配的元素

Line 19:   public ActionResult Index() 
Line 20:   { 
Line 21:    return View(db.locations.ToList()); 
Line 22:   } 
Line 23: 
Source File: E:\WebSite\NezamBarghLorestan\NezamBarghLorestan\Controllers\LocationsController.cs Line: 21 

回答

0

,我發現我的疑難問題在數據註解的人有錯。

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