inheritance

问题 I am trying to change the JSON parser in my web API project. I have followed the following tutorials: https://docs.microsoft.com/en-us/aspnet/core/web-api/advanced/custom-formatters?view=aspnetcore-2.2 https://www.youtube.com/watch?v=tNzgXjqqIjI https://weblog.west-wind.com/posts/2012/Mar/09/Using-an-alternate-JSON-Serializer-in-ASPNET-Web-API I now have the following code: public class MyJsonFormatter : MediaTypeFormatter { public MyJsonFormatter() { base.SupportedMediaTypes.Add(new

问题 I am coming from Java background and currently learning C#. I just had a big surprise regarding (what I perceive as ) a difference in a way that an object accesses methods from base/derived class. Here is what I mean: In Java if I do something like this class InheritanceTesting { public void InheritanceOne() { System.out.println("InheritanceOne"); } } class NewInherit extends InheritanceTesting { public void InheritanceOne() { System.out.println("InheritanceTwo"); } } then run the following:

问题 My problem is perhaps pretty simple, but I just started programming in C#. My problem is, as listed above: "The type "MyProject.Bike" does not contain a constructor that takes '0' arguments". I don't understand, because I don't try to make a call to this constructor with empty parentheses, and reading similar questions were all answered with "You have to much/not enough parameters...". I just made this for learning, but I think inheritance is a pretty important concept, so I would like to be

问题 My problem is perhaps pretty simple, but I just started programming in C#. My problem is, as listed above: "The type "MyProject.Bike" does not contain a constructor that takes '0' arguments". I don't understand, because I don't try to make a call to this constructor with empty parentheses, and reading similar questions were all answered with "You have to much/not enough parameters...". I just made this for learning, but I think inheritance is a pretty important concept, so I would like to be

问题 I'm working on a game. At a certain point, I would like to create special GameObject. The special GameObject is called Projectile and is the same as GameObject but has a dx and dy as well as some other functions that only a projectile will have. I am trying to make Projectile extend the GameObject class, but I run into issues when I try to create an instance of Projectile. I've tried different ways of declaring Projectile and shuffling declaration order but can't seem to figure out why I'm

问题 class A has a pure virtual method read() class B has an implemented virtual method read() I have a class C that inherits A and B Can this happen? What I'm trying to achieve is that the two base classes A and B complement each other. So C read() method would actually call class B read() class A { virtual int get_data() = 0; void print() { log(get_data()); } } class B { virtual int get_data() { return 4; } } class C : public A, public B { } C my_class; my_class.print(); // should log 4; I'm not

问题 class A has a pure virtual method read() class B has an implemented virtual method read() I have a class C that inherits A and B Can this happen? What I'm trying to achieve is that the two base classes A and B complement each other. So C read() method would actually call class B read() class A { virtual int get_data() = 0; void print() { log(get_data()); } } class B { virtual int get_data() { return 4; } } class C : public A, public B { } C my_class; my_class.print(); // should log 4; I'm not

问题 Ok team, Quick summary so you understand my question. We have an MVC app (Proj.MVC) that references a shared project (Shared.MVC). The shared project contains Controllers (BaseController & ApiController), Context, and Session Manager as those will be used by other projects. BaseController & ApiController have a reference to SharedContext and SharedSessionManager. However, some project may need to add additional calls to Context and Session Manager. Now my problem is, I can use Interfaces so

问题 I have a superclass with an abstract method I want to provide some comments on the method and if any subclasses inherited this method this comments will come along with it. class MySuper { //some comments protected abstract void myAbstractMethod(); } class MyChild extends MySuper { //some comments @Override public void updateLanguage() { } } 回答1: You need to add proper java-doc comments, than that implementing class will get those. This technique is used in various places inside the jdk too -

问题 I am using Visual Studio 2008 and have two classes Parent and Child. Parent declares some static const variables in the header, which are then defined in the cpp file. When I try to use the defines as cases in a switch statement in a child class I get the error: C2051: case expression not constant . So I've done some testing and the behavior I'm seeing is somewhat inconsistent. // Parent.h class Parent { public: Parent(); ~Parent(void) { } static const unsigned long A = 1; static const