WCF DataContract继承

Question

我有定义了DataContract的WCF和一些扩展它的其他DataContract。所以在它的原始形式中看起来像这样：

    [DataContract(Name = "FacilityPerson"]
    [KnownType(typeof(Student))]
    [KnownType(typeof(Teacher))]
    public class Person
    {
        [DataMember(IsRequired=true)]
        public string FirstName { get; set; }
        [DataMember]
        public string LastName { get; set; }
        [DataMember]
        public DateTime? DOB { get; set; }   

    }

    [DataContract]
    public class Student
    {
        [DataMember(IsRequired=true)]
        public int StudentID { get; set; }

    }

[DataContract]
public class Teacher
{
    [DataMember(IsRequired=true)]
    public int StaffID { get; set; }

}

我有一个ServieContract，它只有一个操作，如下所示：

[OperationContract(Name = "ReportNewPerson")]
void ReportNewTeacherOrStudent(Person person);

我的问题是，当我实现它的时候，我不能访问父对象的子属性。

public class UniversityService : IUniversityServiceContract  
{

        void ReportNewTeacherOrStudent(Person person)
        {
             if(person.GetType().FullName == "Student")
             {
                     //here I have a parent object so I cannot getStudentId which is a child property           
                     Console.Writeline(person.StudentId);

             }

        }
}

我应该在这里做什么？

Answer 1

不要将类型与名称进行比较；相反，请使用强制转换或as运算符进行比较：

public class UniversityService : IUniversityServiceContract  
{
    public void ReportNewTeacherOrStudent(Person person)
    {
        Student student = person as Student;
        if (student != null)
        {
            Console.Writeline(student.StudentId);
        }
    }
}

Answer 2

检查carlosfigueira的答案。他是对的。

您还需要为Teacher和Student类添加继承：

[DataContract]
public class Student: Person
{
    ...
}

[DataContract]
public class Teacher: Person
{
   ...    
}

更新:是的，您必须同时指定父级和子级中的属性。