entity-framework - 属性X的类型为Y，当前数据库提供程序不支持该属性

Question

我真的是EF的新手（使用EF core 2.1），并且到目前为止已经关注了很多教程，但是现在我开始创建自己的数据库结构，并在尝试向数据库中添加值时偶然发现：

private async Task<int> Insert()
{
    var address = new Address { AddressLine1 = "1 any street",  AddressLine2 = "", AddressLine3 = "", City = "Any city" };

    using (var context = new BranchContext())
    {
        context.Addresses.AddAsync(address);//ERROR HERE
        ....
    }
 }

我得到错误：


InvalidOperationException：属性“ Branch.Address”的类型为“ Address”，当前数据库提供程序不支持该类型。使用'[NotMapped]'属性或'OnModelCreating'中的'EntityTypeBuilder.Ignore'更改属性CLR类型或忽略该属性。


我创建了以下类：

public class Address
{
    public int Id { get; set; }
    public int Guid { get; set; }
    public DateTime CreatedOn { get; set; }
    public string Number { get; set; }
    public string AddressLine1 { get; set; }
    public string AddressLine2 { get; set; }
    public string AddressLine3 { get; set; }
    public string Town { get; set; }
    public string City { get; set; }
    public string Postcode1 { get; set; }
    public string Postcode2 { get; set; }
    public string Latitude { get; set; }
    public string Longitude { get; set; }
}

public class Branch
{
    public string Id { get; set; }
    public string Name { get; set; }
    public Address Address { get; set; }
    public IEnumerable<EmployeeBranch> Employee { get; set; }
    public bool IsMain { get; set; }
}

public class Employee
{
    public int Id { get; set; }
    public string Guid { get; set; }
    public string EmailAddress { get; set; }
    public JobTitle JobTitle { get; set; }
    public DateTime DateOfBirth { get; set; }
    public IEnumerable<EmployeeBranch> Branches { get; set; }
    public Branch PrimaryBranch { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string PreferredName { get; set; }
    public Salutations Salutation { get; set; }
}

public enum Salutations
{
    Mr = 1,
    Mrs = 2,
    Miss = 3,
    Ms = 4
}

public class EmployeeBranch
{
    public int BranchId { get; set; }
    public Branch Branch { get; set; }
    public int EmployeeId { get; set; }
    public Employee Employee { get; set; }
}

public class JobTitle
{
    public int Id { get; set; }
    public string Guid { get; set; }
    public string Name { get; set; }
}

然后我跑了：

Add-Migration init
Update-Database

创建了以下内容：



为了清楚起见，这是一个运行时错误，我已经查看了几个线程，当他们尝试更新db here和 here时会遇到此错误，但是他们的讨论并没有向我指出正确的方向（也许我错过了）显而易见）。

我该如何解决？最好不要更改结构，尽管我很高兴有充分的理由这样做

Answer 1

最终，这似乎是一个相当简单的答案，该错误让我查看了我的类的结构并试图找出哪里出了问题。问题是在我的BranchContext中（我不考虑在问题中共享），我迷上了OnModelCreating并根据需要设置了地址

错误

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<EmployeeBranch>()
        .HasKey(s => new { s.BranchId, s.EmployeeId });
    modelBuilder.Entity<Branch>()
        .Property(s => s.Address).IsRequired();
    modelBuilder.Entity<Branch>()
        .Property(s => s.Name).IsRequired();

    base.OnModelCreating(modelBuilder);
}

对

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<EmployeeBranch>()
        .HasKey(s => new { s.BranchId, s.EmployeeId });

    modelBuilder.Entity<Address>()
        .Property(s => s.AddressLine1).IsRequired();
    modelBuilder.Entity<Address>()
        .Property(s => s.Postcode1).IsRequired();
    modelBuilder.Entity<Address>()
        .Property(s => s.Postcode2).IsRequired();
    ...the other required elements...
    modelBuilder.Entity<Branch>()
        .Property(s => s.Name).IsRequired();

    base.OnModelCreating(modelBuilder);
}