what kind of inheritance is this?

Question

public MyOwnCustomException (string message) : base(message) public MyOwnCustomException(string message Exception inner) : base(message inner) I thought only a Class can use inferitance does a constructor can also use inheritance?

bamboo3 · Answer

Hi: Now I fully understand it  thank you so much.

shimtanny · Answer

Hi Exactly the specified (if not specified the default constructor) base class constructor will be called first  then the constructor in the derived class. This will not work with the methods. I think what you are using is to override a base class method. Define in your base class: public virtual void MyMethod(string s) { // ... do some stuff. } Then use the override keyword in the derived class: public override void MyMethod(string s) { // ... do some otherstuff. // maybe you wannt to call the base class method. base.MyMethod(...); } Cheers Simon

bamboo3 · Answer

sorry  I made some misstake in my last reply. I wrote : public void myMethod(string s): base(string s){} should be : public void myMethod(string s): base.myMethod(string s){}

bamboo3 · Answer

Hi I think I understand what you are talking about. But if I has implemented my constructor will the program call the constructor of base class first then call the code in my construstor later? and can I use this idea in method? for example: public void myMethod(string s): base(string s){} thanks alot for ur help.

shimtanny · Answer

Hi No. It means that your the constructor of the derived class calls a constructor of its base class. Classes inherit methods properties etc. from its base class. But a method of a class cannot inherit from base classes. Sorry i did not found it in msdn... sometimes it is not easy to find something in msdn. Simon

bamboo3 · Answer

hi thank you for ur reply  do you mean that my constructor inherits the base constructor? do you know where can I find the reference in MSDN? thank you.

shimtanny · Answer

Hi public MyOwnCustomException (string message) : base(message) {} A derived class can call a constructor of it's base class (with : base(...)). If no base class constructor is called explicit the default base class constructor will be called. CHeers Simon