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重要信息：我發現很多類似的問題都是關於Unable 以確定關係的主要目的。在SO中，多個添加的 實體可能具有相同的主鍵異常。我閱讀並理解 是什麼意思，它爲什麼會發生。實體框架 - 無法確定主體端點
但是，我無法找到問題在我的模型隱藏特別。如果你能指出究竟做錯了什麼，我將非常感激。 模型在這裏：
public class Faculty : Entity
{
public string Name { get; set; }
public string Acronym { get; set; }
public string Description { get; set; }
public ICollection<Department> Departments { get; set; }
public ICollection<Specialty> Specialties { get; set; }
public ICollection<Student> Students { get; set; }
public ICollection<Employee> Employees { get; set; }
}
public class Department : Entity
{
public string Name { get; set; }
public string Acronym { get; set; }
public string Description { get; set; }
public Guid ? FacultyId { get; set; }
public Faculty Faculty { get; set; }
public ICollection<Subject> Subjects { get; set; }
public ICollection<Employee> Employees { get; set; }
public ICollection<Specialty> Specialties { get; set; }
}
public class Specialty : Entity
{
public string Name { get; set; }
public string Acronym { get; set; }
public string Description { get; set; }
public ICollection<Student> Students { get; set; }
public Guid FacultyId { get; set; }
public Faculty Faculty { get; set; }
public Guid DepartmentId { get; set; }
public Department Department { get; set; }
}
配置：映射在這裏
public class DepartmentConfiguration : EntityConfiguration<Department>
{
public DepartmentConfiguration()
{
Property(p => p.Name).IsRequired().HasMaxLength(200);
Property(p => p.Acronym).IsRequired().HasMaxLength(5);
Property(p => p.Description).HasMaxLength(1000);
HasMany(p => p.Subjects).WithRequired(p => p.Department);
HasMany(p => p.Employees).WithOptional(p => p.Department);
HasMany(p => p.Specialties).WithRequired(p => p.Department);
}
}
public class SpecialtyConfiguration : EntityConfiguration<Specialty>
{
public SpecialtyConfiguration()
{
Property(p => p.Name).IsRequired().HasMaxLength(200);
Property(p => p.Acronym).IsRequired().HasMaxLength(5);
Property(p => p.Description).HasMaxLength(1000);
HasMany(p => p.Students).WithRequired(p => p.Specialty);
}
}
public class FacultyConfiguration : EntityConfiguration<Faculty>
{
public FacultyConfiguration() : base()
{
Property(p => p.Name).IsRequired().HasMaxLength(200);
Property(p => p.Acronym).IsRequired().HasMaxLength(5);
Property(p => p.Description).HasMaxLength(1000);
HasMany(p => p.Departments).WithOptional(p => p.Faculty);
HasMany(p => p.Specialties).WithRequired(p => p.Faculty);
HasMany(p => p.Employees).WithOptional(p => p.Faculty);
HasMany(p => p.Students).WithRequired(p => p.Faculty);
}
}
和異常說，大約部門和專業之間的關係。
無法確定'EMIS.DAL.Context.Department_Specialties'關係的主體末端。多個添加的 實體可能具有相同的主鍵。