inheritance

问题 I meet a problem today. As following. I create a generic Form , public class Form1:Form Then I create another inheritance form, public class From2:Form1. The form2 cannot be shown in the VS designer, the error message is "all the classes in the file cannot be designed", (this error message is translated from Chinese, the Chinese message is 文件中的类都不能进行设计). But this program can be compiled successfully, and when it runs, both Form1 and From2 can work. Anyone can give me some help about this ?

问题 I've created a class that has a bunch of inherited classes (parent classes) so that I can use polymorphism but the problem is that there are two classes that are calling each other. So I need to forward declare them and I can forward declare one class but when I forward declare the inherited class the compiler says it can't change pointer from one to the other. Is there a way to make the forward declaration of the inherited class so that it states it inherits from it? Ex: class Shape; class

问题 I have a class Foo with a function myName in it. Class bar Inherits from Foo and have a Property that is also called myName I figured this should be OK since: The property will compile to get_myName() (so there would not be a collision with Foo::myName(int,int) ) Foo::myName has arguments while, obviously, the property does not (again, no colision). Yet I still get the warning: 'Bar.myName' hides inherited member 'Foo.myName(int, int)'. Use the new keyword if hiding was intended. Example Code

问题 I am following a book namely ".NET Domain Driven Design with C#". Question is based on scenario as shown in Class Diagram below: Figure: http://screencast.com/t/a9UULJVW0 In this diagram, A) IRepository interface is implemented by (abstract base class) RepositoryBase whereas, B) IRepository interface is also extended by interface ICompanyRepository (ICompanyRepository : IRepository). C) ICompanyRepository is implemented by CompanyRepository which is derived from SQLRepositoryBase which is

问题 I want to derive from a derived class SealedDerived but I can't because the class is sealed . If I instead derive from the base class Base , is there any way I can "cheat" and redirect the this reference to an object of the SealedDerived class? For example, like this: public class Base { ... } public sealed class SealedDerived : Base { ... } public class MyDerivedClass : Base { public MyDerivedClass() { this = new SealedDerived(); // Won't work, but is there another way? } } EDIT Upon request

问题 Apologies if this doesn't make sense, i'm not much of an experienced programmer. Consider the following code: import mymodule class MyClass: def __init__(self): self.classInstance = myModule.classInstance() and then ...... from mymodule import classInstance class MyClass(classInstance): def __init__(self): pass If I just wanted to use the one classInstance in MyClass, is it ok to import the specific class from the module and have MyClass inherit this class ? Are there any best practices, or

问题 Apologies if this doesn't make sense, i'm not much of an experienced programmer. Consider the following code: import mymodule class MyClass: def __init__(self): self.classInstance = myModule.classInstance() and then ...... from mymodule import classInstance class MyClass(classInstance): def __init__(self): pass If I just wanted to use the one classInstance in MyClass, is it ok to import the specific class from the module and have MyClass inherit this class ? Are there any best practices, or

问题 Apologies if this doesn't make sense, i'm not much of an experienced programmer. Consider the following code: import mymodule class MyClass: def __init__(self): self.classInstance = myModule.classInstance() and then ...... from mymodule import classInstance class MyClass(classInstance): def __init__(self): pass If I just wanted to use the one classInstance in MyClass, is it ok to import the specific class from the module and have MyClass inherit this class ? Are there any best practices, or

问题 I'm trying to create a class hierarchy such that I can have: SpecificScreenController < ScreenController < Singleton So far I have these set up as: public abstract class Singleton<T> : MonoBehaviour where T : MonoBehaviour { private static T _instance; public static T Instance{ get{... return _instance;} } } public abstract class ScreenController<T> : Singleton<T> where T : MonoBehaviour { public GAME_SCREEN GameScreen; //many more ScreenController common properties/fields/methods } public

问题 I'm trying to create a class hierarchy such that I can have: SpecificScreenController < ScreenController < Singleton So far I have these set up as: public abstract class Singleton<T> : MonoBehaviour where T : MonoBehaviour { private static T _instance; public static T Instance{ get{... return _instance;} } } public abstract class ScreenController<T> : Singleton<T> where T : MonoBehaviour { public GAME_SCREEN GameScreen; //many more ScreenController common properties/fields/methods } public