https://msdn.microsoft.com/en-us/library/ms173157.aspx If a class implements two interfaces that contain a member with the same signature, then implementing that member on the class will cause both interfaces to use that member as their implementatio…

疑惑 前段时间一直再用Entity Framework 6,写了一些公用的方法,在这个过程中发现了DbContext实现的接口IObjectContextAdapter,可以通过这个接口访问到更底层的ObjectContext对象,比如 ((IObjectContextAdapter)ctx).ObjectContext 当时就觉得很奇怪,为什么不能直接获取,而需要一次转换,主要是奇怪C#是通过什么形式把ObjectContext给hide住的,不过当时也没多想,忙于完成工作.最近比较系统的再过…

C# explicit interface implementation 某个类要实现两个包含相同方法名的接口, 应该如何实现这两个方法? namespace ExplicitInterfaceImplementation { class Program : IPrintOne,IPrintTwo, IPrintThree { static void Main(string[] args) { Program p = new Program(); p.Print(); (p as IPrintT…

https://msdn.microsoft.com/en-us/library/ms173156.aspx An interface contains definitions for a group of related functionalities that a class or a struct can implement. By using interfaces, you can, for example, include behavior from multiple sources…

原文:View Programming Guide for iOS View and Window Architecture Views and windows present your application’s user interface and handle the interactions with that interface. UIKit and other system frameworks provide a number of views that you can use a…

Io Programming Guide     Introduction Perspective Getting Started Downloading Installing Binaries Running Scripts Interactive Mode Syntax Expressions Messages Operators Assignment Numbers Strings Comments Objects Overview Prototypes Inheritance Metho…

原文:View Programming Guide for iOS 1 Introduction 先熟悉一下基本概念. Window Windows do not have any visible content themselves but provide a basic container for your application's views. Every application has at least one window that displays the application'…

View and Window Architecture 视图和窗口架构 Views and windows present your application’s user interface and handle the interactions with that interface. UIKit and other system frameworks provide a number of views that you can use as-is with little or no mod…

Custom Layouts: A Worked Example Creating a custom collection view layout is simple with straightforward requirements, but the implementation details of the process may vary. Your layout must produce layout attributes objects for every view your coll…

Resizing the View Controller’s Views A view controller owns its own view and manages the view’s contents. In the process, the view controller also manages the view’s subviews. But in most cases, the view’s frame is not set directly by the view contro…

Resource Management in View Controllers View controllers are an essential part of managing your app’s resources. View controllers allow you to break your app up into multiple parts and instantiate only the parts that are needed. But more than that, a…

View Controller Basics Apps running on iOS–based devices have a limited amount of screen space for displaying content and therefore must be creative in how they present information to the user. Apps that have lots of information to display must there…

About View Controllers View controllers are a vital link between an app’s data and its visual appearance. Whenever an iOS app displays a user interface, the displayed content is managed by a view controller or a group of view controllers coordinating…

Navigating a Data Hierarchy with Table Views 导航数据表视图层次 A common use of table views—and one to which they’re ideally suited—is to navigate hierarchies of data. A table view at a top level of the hierarchy lists categories of data at the most general l…

Views Because view objects are the main way your application interacts with the user, they have many responsibilities. Here are just a few: 因为视图对象是应用程序跟用户交互的主要方式,所以它们有很多责任.以下是其中一小部分: Layout and subview management 布局和子视图管理 A view defines its own defau…

Windows Every iOS application needs at least one window—an instance of the UIWindow class—and some may include more than one window. A window object has several responsibilities: 每个iOS应用程序需要至少一个窗口---UIWindow类的一个实例---有些可能有不止一个窗口.窗口对象的任务是: It contains…

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…

新博客:完整版 - AVFoundation Programming Guide 分章节版:- 第1章:About AVFoundation - AVFoundation概述- 第2章:Using Assets - 使用Assets- 第3章:Playback - 播放- 第4章:Editing - 编辑- 第5章:Still and Video Media Capture - 静态视频媒体捕获- 第6章:Export - 输出- 第7章:Time and Media Representatio…

Structured Streaming编程 Programming Guide Overview Quick Example Programming Model Basic Concepts Handling Event-time and Late Data Fault Tolerance Semantics API using Datasets and DataFrames Creating streaming DataFrames and streaming Datasets Input…

参考,http://spark.incubator.apache.org/docs/latest/streaming-programming-guide.html Overview SparkStreaming支持多种流输入,like Kafka, Flume, Twitter, ZeroMQ or plain old TCP sockets,并且可以在上面进行transform操作,最终数据存入HDFS,数据库或dashboard另外可以把Spark's in-built machine le…

About Table Views in iOS Apps Table views are versatile user interface objects frequently found in iOS apps. A table view presents data in a scrollable list of multiple rows that may be divided into sections. 表格视图是通用用户界面对象,常常能在iOS应用程序里看到. 表格视图在一个多行的一…

  Animations Animations provide fluid visual transitions between different states of your user interface. In iOS, animations are used extensively to reposition views, change their size, remove them from view hierarchies, and hide them. You might use…

  Designing Your Data Source and Delegate 设计你的数据源和委托 Every collection view must have a data source object providing it with content to display. The data source object is an object that your app provides. It could be an object from your app’s data mod…

Next About Windows and Views 关于窗口和视图 In iOS, you use windows and views to present your application’s content on the screen. Windows do not have any visible content themselves but provide a basic container for your application’s views. Views define a…

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/kwtft8ak(v=vs.140).aspx It is often useful to define interfaces either for generic collection classes, or for the generic classes that represent items in the collection. The preference偏爱,优先权 for generic classe…

https://www.cmrr.umn.edu/~strupp/serial.html#CONTENTS Introduction Chapter 1, Basics of Serial Communications What Are Serial Communications? What Is RS-232? Signal Definitions Asynchronous Communications What Are Full Duplex and Half Duplex? Flow Co…

Quartz 2D Programming  Guide 官方文档: Quartz 2D Programming Guide 译文: Quartz 2D编程指南(1) - 概览 Quartz 2D编程指南(2) - 图形上下文(Graphics Contexts) Quartz 2D编程指南(3) - 路径(Paths)[上] Quartz 2D编程指南(3) - 路径(Paths)[下] Quartz 2D编程指南(4) - 颜色和颜色空间 Quartz 2D编程指南(5) - 变换 Quar…

目录 Overview Quick Example Programming Model Basic Concepts Handling Event-time and Late Data Fault Tolerance Semantics API using Datasets and DataFrames Creating streaming DataFrames and streaming Datasets Input Sources Schema inference and partition…

学习的资料是官网的Programming Guide https://spark.apache.org/docs/latest/graphx-programming-guide.html 首先是GraphX的简介 GraphX是Spark中专门负责图和图并行计算的组件. GraphX通过引入了图形概念来继承了Spark RDD:一个连接节点和边的有向图 为了支持图计算,GraphX引入了一些算子: subgraph, joinVertices, and aggregateMessages等 和 …