公共基类初始化

Question

Take the scenario

BaseA -> SubB -> SubSubC

Explanation: SubSubC class inherits SubB class. The SubB class inherits BaseA class

BaseA -> SubD -> SubSubE

Explanation: SubSubE class inherits SubD class. The SubB class inherits BaseA class

So..on..

So there are many class that has its grand parent class as BaseA . The BaseA class has some properties that are common to all the methods. ex: CustomerID, LastLogin, UniqueName etc.

This is how the class is designed in the service which I'm consuming.

My doubt is While calling the service methods, all the methods would expect a parameter of any SubSub class. Can anyone please tell me, is there any way if I could assign values to the properties of the BaseA in one place so that while creating the SubSub objects I did not need to fill the base properties each time?

I'm using C# as my language.

Code:

public class BaseA
    {
        public int CustomerId { get; set; }
        public string UniqueName { get; set; }
    }

    public class SubB : BaseA
    {
    }
    public class SubSubC : SubB
    {

    }

    public class SubD : BaseA
    {
    }
    public class SubSubE : SubD
    {

    }

    public class MyMain
    {
        public void SendRequestToService1()
        {
            (new MyServiceObject()).ServiceMethod1(new SubSubC());
        }

        public void SendRequestToService2()
        {
            (new MyServiceObject()).ServiceMethod2(new SubSubE());
        }
    }

In the above code, in SendRequestToService1 and SendRequestToService2 , i need to initialise the base class properties CustomerId and UniqueName. Ex:

(new SubSubC(){ CustomerId=2, UniqueName="XXBB" });

If there are many methods, I need to initialize these properties each time for their respective classes. Is there a way I can initialize the base properties CustomerId and UniqueName in one place so that the inheriting classes(SubSubC,SubSubE here) no need to initialize when their objects are created?

Answer 1

Are you asking about calling base constructors? If so:

class SubSubC : SubB
{
    public object CProperty { get; private set; }
    public SubSubC(object cProperty, string bProperty, int id) : base(bProperty, id)
    {
        CProperty = cProperty;
    }
}
class SubB : BaseA
{
    public string BProperty { get; private set; }
    public SubB(string bProperty, int id) : base(id)
    {
        BProperty = bProperty;
    }
}
class BaseA
{
    public int ID { get; private set; }
    public BaseA(int id)
    {
        ID = id;
    }
}

Or are you asking about initializing objects in a method? If so (assume the setters are public in the following code, unlike in the preceding):

void SetSubSubCProperties(SubSubC c, object cProperty, string bProperty, int id)
{
    c.CProperty = cProperty;
    SetSubBProperties(c, bProperty, id);
}
void SetSubBProperties(SubB b, string bProperty, int id)
{
    b.BProperty = bProperty;
    SetBaseAProperties(b, id);
}
void SetBaseAProperties(BaseA a, int id)
{
    a.ID = id;
}

Ok, Alex Filipovici's answer, it looks like you want to initialize an instance of a derived class by copying the base class properties from an instance of a different derived class. In that case, to reduce the duplication in Alex's answer, you can do this:

void Initialize(BaseA source, BaseA target)
{
    target.CustomerID = source.CustomerID;
    target.UniqueName = source.UniqueName;
}

Then, to modify his example:

public void SendRequestToService1()
{
    var subSub = new SubSubC();
    Initialize(this.baseA, subSub);
    (new MyServiceObject()).ServiceMethod1(subSub);
}

public void SendRequestToService2()
{
    var subSub = new SubSubE();
    Initialize(this.baseA, subSub);
    (new MyServiceObject()).ServiceMethod2(subSub);
}

Answer 2

Are you looking for the following functionality?

    //dummy class replacing the service object and it's methods
    public class MyServiceObject
    {
        public void ServiceMethod1(SubSubC param)
        { }
        public void ServiceMethod2(SubSubE param)
        { }
    }

    public class BaseA
    {
        public int CustomerId { get; set; }
        public string UniqueName { get; set; }
    }

    public class SubB : BaseA
    {
    }
    public class SubSubC : SubB
    {
    }

    public class SubD : BaseA
    {
    }
    public class SubSubE : SubD
    {
    }

    public class MyMain
    {
        //declare the SubSub objects
        //SubSubC subSubC;
        //SubSubE subSubE;
        BaseA baseA;

        public MyMain()
        {
            //assign the values to each class in the MyMain contrsuctor
            baseA = new BaseA { CustomerId = 2, UniqueName = "XXBB" };

        }

        public void SendRequestToService1()
        {
            var subSub=new SubSubC();
            (new MyServiceObject()).ServiceMethod1(Initialize(subSub));
        }

        public void SendRequestToService2()
        {
            var subSub = new SubSubE();
            (new MyServiceObject()).ServiceMethod2(Initialize(subSub));
        }

        private T Initialize<T>(T subSub) where T:BaseA
        {
            subSub.CustomerId = baseA.CustomerId;
            subSub.UniqueName = baseA.UniqueName;
            return subSub;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            MyMain myMain = new MyMain();
            myMain.SendRequestToService1();
            myMain.SendRequestToService2();
        }
    }

Answer 3

Not sure I understand your question.

public class A {
  public int ID { get; set; }
}

public class B : A {
}

you can do B b = new B() and then b.ID = 12 .

---

Or, if you have a method that gets a parameter of type A in your service you can change the value in the same way.

public void doSomething(A a) {
  a.ID = 12;
}

and call the method with instances of B - doSomething(new B())