ASP.NET核心與實體框架多對多不工作

Organization型號：

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

namespace Verbonding.Models 
{ 
    public class Organization 
    { 
     public int Id { get; set; } 
     public string Name { get; set; } 

     public ICollection<OrganizationApplicationUser> OrganizationApplicationUsers { get; set; } 

     public Organization() 
     { 
      IsActive = true; 
      IsBlocked = false; 
      DateCreated = DateTime.Now; 
      DateUpdated = DateTime.Now; 
     } 

     public ApplicationUser AddUser(ApplicationUser user) 
     { 
      OrganizationApplicationUser ou = new OrganizationApplicationUser { ApplicationUser = user, Organization = this }; 

      OrganizationApplicationUsers.Add(ou); 
      return user; 
     } 
    } 
}

ApplicationUser型號：

using System; 
using Microsoft.AspNetCore.Identity.EntityFrameworkCore; 
using System.Linq; 

namespace Verbonding.Models 
{ 
    public class ApplicationUser : IdentityUser 
    { 
     public bool IsActive { get; set; } 

     public IQueryable<OrganizationApplicationUser> OrganizationApplicationUsers { get; set; } 

     public ApplicationUser():base() 
     { 
      IsActive = true; 
      IsBlocked = false; 
      DateJoined = DateTime.Now; 
      DateUpdated = DateTime.Now; 
     } 

     public IQueryable<Organization> GetOrganizations() 
     { 
      return OrganizationApplicationUsers.Select(x => x.Organization); 
;  } 
    } 
}

DbContext：

using Microsoft.AspNetCore.Identity.EntityFrameworkCore; 
using Microsoft.EntityFrameworkCore; 
using Verbonding.Models; 

namespace Verbonding.Data 
{ 
    public class ApplicationDbContext : IdentityDbContext<ApplicationUser> 
    { 
     public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) 
      : base(options) 
     { 
     } 

     protected override void OnModelCreating(ModelBuilder builder) 
     { 
      base.OnModelCreating(builder); 

      builder.Entity<OrganizationApplicationUser>().HasKey(x => new { x.OrganizationId, x.ApplicationUserId }); 
     } 

     public DbSet<Country> Countries { get; set; } 
     public DbSet<Address> Addresses { get; set; } 
     public DbSet<Organization> Organizations { get; set; } 
     public DbSet<Category> Categories { get; set; } 
     public DbSet<Event> Events { get; set; } 
     public DbSet<OrganizationApplicationUser> OrganizationApplicationUsers { get; set; } 
    } 
}

經過一番研究，我也添加了這個代碼到OnModelCreating方法。

builder.Entity<OrganizationApplicationUser>() 
    .HasOne(ou => ou.Organization) 
    .WithMany(o => o.OrganizationApplicationUsers) 
    .HasForeignKey(ou => ou.Organization); 

builder.Entity<OrganizationApplicationUser>() 
    .HasOne(ou => ou.ApplicationUser) 
    .WithMany(u => u.OrganizationApplicationUsers) 
    .HasForeignKey(ou => ou.ApplicationUserId);

使用我發現OrganizationApplicationUsers調試器仍然null。

我能做些什麼來解決這個問題？

來源

2016-12-03 Johan Vergeer

你的命名比較混亂。你的意思'Organization.OrganizationApplicationUsers'或'ApplicationDbContext.OrganizationApplicationUsers'仍然爲空？ –

*當*是否保留爲空？如果您希望它延遲加載 - 這還沒有（支持）。 –

如果你想擁有什麼叫實體之間的多對多關係，你需要直接鏈接ApplicationUser到Organization（引擎蓋下，實體框架是要創建表之間的，但你的類不會知道這一點。

除此之外，在ApplicationUser，它應該是一個IColletion而不是IQueryable。

來源

2016-12-03 18:20:55

ASP.NET核心與實體框架多對多不工作

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