c# - 与 IsNullable 冲突的配置设置 = true IsNullable = false 重用 ComplexType

Question

我不知道此行为是设计使然还是 EF6 中的错误，或者是否有其他方法可以执行此操作。具有这种复杂类型:

[ComplexType]
public partial class Company    
    public bool HasValue { get { return !string.IsNullOrEmpty(this.Name); } }

    [MaxLength(100)]
    public string Name { get; set; }

    [MaxLength(20)]
    public string PhoneNumber { get; set; }

    [MaxLength(128)]
    public string EmailAddress { get; set; }
}

我在这两个实体中重用了它:

public partial class Customer
{
    public Customer ()
    {
        this.Company = new Company();       
    }

    [Key]
    public int IdCustomer { get; set; }

    [MaxLength(100)]
    [Required]
    public string FirstName { get; set; }

    [MaxLength(100)]
    [Required]
    public string LastName { get; set; }

    public Company Company { get; set; }

    public virtual AcademicInfo AcademicInfo { get; set; }
}


public partial class AcademicInfo
{       
    public AcademicInfo()
    {
        this.Organization = new Company();
    }       

    [Key, ForeignKey("Customer")]
    public int IdCustomer { get; set; }

    public Company Organization { get; set; }

    [MaxLength(100)]
    public string Subject { get; set; }

    [MaxLength(100)]
    public string Degree { get; set; }

    public virtual Customer Customer { get; set; }
}

在 dbcontext 的 OnModelCreating 中(编辑:为了简单起见，我添加了之前省略的 FK 代码):

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{    
    modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

    // ... Other code here related to entities not related to the problem reported omitted to avoid confusion.

    modelBuilder.Entity<AcademicInfo>()
            .HasRequired(a => a.Customer)
            .WithOptional(c => c.AcademicInfo)
            .WillCascadeOnDelete(true);

    modelBuilder.Entity<Customer>()
            .Property(p => p.Company.Name)
            .HasColumnName("CompanyName")
            .IsOptional(); // CONFLICT HERE
    modelBuilder.Entity<Customer>()
            .Property(p => p.Company.EmailAddress)
            .HasColumnName("CompanyEmailAddress")
            .IsOptional();  //CONFLICT HERE
    modelBuilder.Entity<Customer>()
            .Property(p => p.Company.PhoneNumber)
            .HasColumnName("CompanyPhoneNumber")
            .IsOptional();

    modelBuilder.Entity<AcademicInfo>()
            .Property(a => a.Organization.Name)
            .HasColumnName("OrganizationName")
            .IsRequired(); // CONFLICT
    modelBuilder.Entity<AcademicInfo>()
            .Property(a => a.Organization.EmailAddress)
            .HasColumnName("OrganizationEmail")
            .IsRequired(); // CONFLICT
    modelBuilder.Entity<AcademicInfo>()
            .Property(a => a.Organization.PhoneNumber)
            .HasColumnName("OrganizationPhone")
            .IsOptional();
}

添加迁移命令失败并出现以下错误:为“公司”类型的属性“名称”指定了冲突的配置设置: IsNullable = False 与 IsNullable = True 冲突

但这没有任何意义，因为我在 AcademicInfo 表中定义了不可为空的字段，在 Customer 表中定义了可为空的字段。

Answer 1

这是一个老问题，但对 EF 版本 6.1.3 仍然有效。

根据 this issue该行为是关于如何配置特定复杂类型的 Entity Framework 限制。

This is a limitation of EF, some property facets need to be stored in C-Space and EF doesn't have a way of configuring a particular usage of a complex type. So you can only specify different S-Space facets like ColumnName or ColumnType