The C# language is designed so that versioning between base and derived classes in different libraries can evolve发展 and maintain backward compatibility向后兼容. This means, for example, that the introduction of a new member in a base class with the same…

https://msdn.microsoft.com/en-us/library/ms173153.aspx In C#, a method in a derived class can have the same name as a method in the base class. You can specify how the methods interact by using the new and override keywords. The override modifier ext…

https://msdn.microsoft.com/en-us/library/ebca9ah3.aspx The override modifier is required to extend or modify the abstract or virtual implementation of an inherited method, property, indexer, or event. Example In this example, the Square class must pr…

https://msdn.microsoft.com/en-us/library/9fkccyh4.aspx The virtual keyword is used to modify a method, property, indexer, or event declaration and allow for it to be overridden in a derived class. For example, this method can be overridden by any cla…

https://msdn.microsoft.com/en-us/library/ms173152.aspx Polymorphism is often referred to as the third pillar of object-oriented programming, after encapsulation and inheritance.  面向对象编程的三个特性:封装,继承,多态 Polymorphism is a Greek word that means "many-shap…

1 1 1 .NET 面试题, C# ,override , overloading, 覆写, 重载,.NET,ASP.NET, override (覆写/重写): 方法名相同,参数的个数和类型相同,内部实现不同. The override modifier is required to extend or modify the abstract or virtual implementation of an inherited method, property, indexer, or eve…

CoreData详解 介绍: 在Cocoa环境下,如果你想使用数据库(如sqlite),你可以使用sql语句的方式通过相关的工具类进行数据库的直接操作.当然你也可以通过别人封装之后的一些简单框架,使得你的操作更加简单(如FMDB BNRPersistence). Cocoa框架本身提供了CoreData这个API可方便的让开发者通过操作对象的方式在操作数据库.CoreData是一个对象图(object graph)以及持久化的管理框架.我们可以通过CoreData创对象,设置好象之间的关系,然后…

Shared App Information You can access these properties from the App Details page in the App Information section. This information is shared across any platform added to the app. Property Description Editable Primary Language The language you use to e…

//YJYAppDelegate.m #import "YJYAppDelegate.h" #import "YJYMasterViewController.h" @implementation YJYAppDelegate //@synthesize managedObjectContext = _managedObjectContext;的含义就是属性managedObjectContext的存取方法是做用于_managedObjectContext这个变量的.…

http://www.oracle.com/technetwork/java/javase/documentation/index-137868.html This document describes the style guide, tag and image conventions we use in documentation comments for Java programs written at Java Software, Oracle. It does not rehash r…