表中沒有顯示在asp.net中的關係mvc5

Question

我正在構建一個asp.net應用程序。我有兩節課，一節是電影和一節課，在那裏我實現了多方面的關係。

主任級

public class Director 
{ 
    private ICollection<Film> _films; 

    public Director() 
    { 
     _films = new List<Film>(); 
    } 

    public int DirectorID { get; set; } 

    public string fName { get; set; } 

    public string lName { get; set; } 

    public int Age { get; set; } 

    public virtual ICollection<Film> Films 
    { 
     get { return _films; } 
     set { _films = value; } 
    } 
} 

薄膜級

public class Film 
{ 
    private ICollection<Director> _directors; 

    public Film() 
    { 
     _directors = new List<Director>(); 
    } 

    public int FilmId { get; set; } 

    public string Name { get; set; } 

    public int Minutes { get; set; } 

    public string AgeClassification { get; set; } 

    public virtual ICollection<Director> Directors 
    { 
     get { return _directors; } 
     set { _directors = value; } 
    } 
} 

種子法

protected override void Seed(FilmNetwork.Models.FilmNetworkContext context) 
    { 

     var films = new List<Film> 
      { 
       new Film() { FilmId = 1, Name = "The Dark Knight", Minutes = 152, AgeClassification = "15A" }, 
       new Film() { FilmId = 2, Name = "The Social Network", Minutes = 120, AgeClassification = "15A" }, 
       new Film() { FilmId = 3, Name = "Up In The Air", Minutes = 109, AgeClassification = "15A" }, 
       new Film() { FilmId = 4, Name = "Slumdog Millionaire", Minutes = 120, AgeClassification = "15A" }, 
       new Film() { FilmId = 5, Name = "The Wolf Of Wall Street", Minutes = 180, AgeClassification = "18" }, 
       new Film() { FilmId = 6, Name = "King Kong", Minutes = 221, AgeClassification = "12" }, 
       new Film() { FilmId = 7, Name = "Schindler's List", Minutes = 195, AgeClassification = "18" } 
      }; 
      films.ForEach(f => context.Films.AddOrUpdate(film => film.Name, f)); 
      context.SaveChanges(); 



     var directors = new List<Director> 
      { 
       new Director() { DirectorID = 1, fName = "Christopher", lName = "Nolan", Age = 46, 
        Films = films.Where(f => (f.Name == "The Dark Knight")).ToList()}, 
       new Director() { DirectorID = 2, fName = "David", lName = "Fincher", Age = 54, 
        Films = films.Where(f => (f.Name == "The Social Network")).ToList() }, 
       new Director() { DirectorID = 3, fName = "Jason", lName = "Reitman", Age = 39, 
        Films = films.Where(f => (f.Name == "Up In The Air")).ToList() }, 
       new Director() { DirectorID = 4, fName = "Danny", lName = "Boyle", Age = 60, 
        Films = films.Where(f => (f.Name == "Slumdog Millionaire")).ToList() }, 
       new Director() { DirectorID = 5, fName = "Martin", lName = "Scorsese", Age = 74, 
        Films = films.Where(f => (f.Name == "The Wolf Of Wall Street")).ToList() }, 
       new Director() { DirectorID = 6, fName = "Peter", lName = "Jackson", Age = 55, 
        Films = films.Where(f => (f.Name == "King Kong")).ToList() }, 
       new Director() { DirectorID = 7, fName = "Steven", lName = "Spielberg", Age = 70, 
        Films = films.Where(f => (f.Name == "Schindler's List")).ToList() }, 
      }; 
      directors.ForEach(d => context.Directors.AddOrUpdate(director => director.lName, d)); 
      context.SaveChanges(); 

我有一個電影製片基於ID的AJAX搜索。它返回電影，導演領域的董事是空白的，因爲這種關係沒有被執行。

Answer 1

您應該在這兒加上導演：

new Film() { FilmId = 1, Name = "The Dark Knight", Minutes = 152, AgeClassification = "15A" } 

而且你絕對需要有多對多的關係？當電影多於一位導演的情況並不多，所以添加一對多關係會更簡單。

如何實現一對多的關係：

主任級

public class Director 
{ 



    public int DirectorID { get; set; } 

    public string fName { get; set; } 

    public string lName { get; set; } 

    public int Age { get; set; } 

    public virtual ICollection<Film> Films{get;set;} 

} 

薄膜級

public class Film 
{ 



    public int FilmId { get; set; } 

    public string Name { get; set; } 

    public int Minutes { get; set; } 

    public string AgeClassification { get; set; } 

    public virtual Director Director { get; set; } 
} 

然後，只需添加這樣的：

new Film() { FilmId = 1, Name = "The Dark Knight", Minutes = 152, AgeClassification = "15A" Director = _context.directors.where(x=> x.ID == "1"// or whichever parameter you want to find director from list) }