C# Ef迁移错误

我需要幻化我的dbContext类，但我遇到了以下错误：

System.Data.Entity.Edm.EdmEntityType: : EntityType 'UserType' has no key defined. Define the key for this EntityType.
System.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'UserTypes' is based on type 'UserType' that has no keys defined.

以下是我的DbContext：

namespace seraydar.Models
{
    public class Context : DbContext
    {
        public DbSet<UserType> UserTypes { get; set; }
    }
}

---

我只是糊涂了

默认情况下，实体框架只查看公共属性。您的属性不是公共的，因此将忽略它们。 解决此问题的最简单方法是将其公开：

public class UserType
{
    [Key]
    public int id { get; set; }

    [Required, MaxLength(30, ErrorMessage = "Name can not be longer than 30 characters."), Display(Name = "User Type")]
    public string userType { get; set; }
}

然后迁移将正常工作

public class UserType
{
    [Key]
    public int id { get; set; }

    [Required, MaxLength(30, ErrorMessage = "Name can not be longer than 30 characters."), Display(Name = "User Type")]
    public string userType { get; set; }
}