EF Core 错误加入实体类型名称

Question

我有三个实体，如下所示：

public class Application
{
    [Key]
    public int ApplicationId { get; set; }
    public string Name { get; set; }
    public virtual ICollection<User> Users { get; set; }
}

public class User
{
    [Key]
    public int UserId { get; set; }
    public string UserName { get; set; }
    public virtual ICollection<Application> Applications { get; set; }
}

加入实体

public class UserApplication
{
    public int UserId { get; set; }
    public int ApplicationId { get; set; }
    [ForeignKey("UserId")]
    public User User { get; set; }
    [ForeignKey("ApplicationId")]
    public Application Application { get; set; }
}

OnModelCreating 节 =>

modelBuilder.Entity<User>()
               .HasMany(x => x.Applications)
               .WithMany(x => x.Users)
               .UsingEntity(ua => ua.ToTable("UserApplication"));

modelBuilder.Entity<UserApplication>()
                .HasKey(a=> new { a.ApplicationId, a.UserId});

运行代码导致错误

invalid object name => ApplicationUser.

注意 - 虽然 OnModelCreating 只有名称错误的实体存在。数据库具有 table 名称 UserApplication

Answer 1

您混合使用了显式和隐式连接实体。恐怕 EF Core 假设 2 个单独的 many-to-many 关系与 2 个单独的表。请注意，按照惯例，隐式连接实体名称为 {Name1}{Name2}，名称按升序排列，在您的情况下为 ApplicationUser.

您需要的是使用 UsingEntity 流畅 API 的泛型重载，并将显式连接实体类型作为泛型类型参数传递。还要在那里配置加入实体，而不是单独配置。例如

modelBuilder.Entity<User>()
    .HasMany(x => x.Applications)
    .WithMany(x => x.Users)
    .UsingEntity<UserApplication>(
        //             ^^^
        ua => ua.HasOne(e => e.Application).WithMany().HasForeignKey(e => e.ApplicationId),
        ua => ua.HasOne(e => e.User).WithMany().HasForeignKey(e => e.UserId),
        ua =>
        {
            ua.ToTable("UserApplication");
            ua.HasKey(a => new { a.ApplicationId, a.UserId });
        });

EF Core 错误加入实体类型名称

EF Core wrong Join entity type name

entity-framework

entity-framework-core

.net-core