如何插入數據加入其中，通過使用EF代碼第一次

Question

創建的表我都定義爲

1）項目類

public class Project 
{ 
    [Key] 
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] 
    public int ProjectId { get; set; } 
    public string Title { get; set; } 
    public string Description { get; set; } 
    public DateTime CreatedDate { get; set; } 
    public ICollection<Person> Persons { get; set; } 
} 

2）人兩個實體類類

public class Person 
    { 
     public Person() 
     { 
      Projects = new List<Project>(); 
     } 


     [Key] 
     [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] 
     public int PersonId { get; set; } 
     public string Name { get; set; } 
     public string EmailAddress { get; set; } 
     public string Designation { get; set; } 
     public string CellPhone { get; set; } 
     public ICollection<Project> Projects { get; set; } 
    } 

而在我的DataContext類中，配置定義爲

public class DataContext: DbContext 
    { 
     public DataContext() 
      : base("name=DataContext") 
     { 
     } 

     public DbSet<Project> Projects { get; set; } 

     public DbSet<Person> Persons { get; set; } 


     protected override void OnModelCreating(DbModelBuilder modelBuilder) 
     { 
      modelBuilder.Entity<Project>() 
       .HasMany<Person>(p => p.Persons) 
       .WithMany(p => p.Projects) 
       .Map(m => 
       { 
        m.ToTable("ProjectPersons"); 
        m.MapLeftKey("ProjectId"); 
        m.MapRightKey("PersonId"); 
       }); 


     } 

    } 

我創造了新的項目後，項目表，表的人用它填充的紀錄，但我發現它是通過接合不與專案編號和PERSONID填充創建ProjectPerson表。

任何建議嗎？

這裏是我的HttpPost方法來創建新的項目

[HttpPost] 
     public ActionResult CreateProject(Projects newProject, int page = 1) 
     { 


      _ctx.Projects.AddProject(newProject, ref _ctx); 
      _ctx.Person.AddPerson(newProject.Person, newProject, ref _ctx); 

      _ctx.SaveChanges(); 

var userProjects = _ctx.Projects.GetStaffUserProjects(providerUserKey, page, ref _ctx); 
        return PartialView("_Projects", userProjects); 

     } 

這裏是我的推廣方法， 'AddProject' 和 'addPerson的'

1）AddProject

public static void AddProject(this IEnumerable<Project> projects, Projects newProject, ref DataContext ctx) 
     { 


       var project = new Project 
           { 
            Title = newProject.Title, 
            Duration = newProject.Duration, 
            Description = newProject.Description, 
            CreatedDate = DateTime.Now, 
            Status = true, 
            UserId = (int)Membership.GetUser().ProviderUserKey, 
            ProjectCategoryId = newProject.SelectedProjectCategoryId, 
            OrganizationId = newProject.SelectedOrganizationId 
           }; 




      ctx.Projects.Add(project); 
     } 

2） addPerson的

public static void AddPerson(this IEnumerable<Person> persons, Person newPerson, Projects newProject, ref DataContext ctx) 
     { 



        var person = new Person 
            { 
             Name = newPerson.Name, 
             EmailAddress = newPerson.EmailAddress, 
             CellPhone = newPerson.CellPhone, 
             Designation = newPerson.Designation 
            }; 



       ctx.Person.Add(person); 
      } 
     } 

Answer 1

爲了創造人與項目之間，你必須添加您添加或附加到上下文到合適的導航採集項目的關係。要做到這一點（與你的現有代碼的最小變動）從AddProject返回創建的項目：

public static Project AddProject(this IEnumerable<Project> projects, 
    Projects newProject, ref DataContext ctx) 
{ 
    var project = new Project { ... }; 
    ctx.Projects.Add(project); 
    return project; 
} 

然後通過返回的這個項目分成AddPerson：

var project = _ctx.Projects.AddProject(newProject, ref _ctx); 
_ctx.Person.AddPerson(newProject.Person, project, ref _ctx); 
_ctx.SaveChanges(); 

而且在AddPerson它添加到人的Projects收藏：

public static void AddPerson(this IEnumerable<Person> persons, Person newPerson, 
    Projects project, ref DataContext ctx) 
{ 
    var person = new Person { ... }; 
    if (project != null) 
     person.Projects.Add(project); 
     // the preceding line tells EF about the relationship and will make it 
     // generate an INSERT statement for the link table ProjectPerson 
    ctx.Person.Add(person); 
}