Ray's playground

摘要： It certainly can get complicated describing exactly how covariance andcontravariance work. Thankfully, now the language supports decoratinggeneric interfaces and delegates with in (contravariant) and out (covariant)modifiers. You should decorate any interfaces and delegates you definewith the in or 阅读全文

摘要： Nothing special. 阅读全文

摘要： The .NET Framework provides a simple, standard algorithm for serializingyour objects. If your type should be persisted, you should follow thestandard implementation. If you don’t support serialization in your types,other classes that use your type can’t support serialization, either. Mak 阅读全文

摘要： You built the interfaceto your class, and you want users to follow it. You don’t want users to accessor modify the internal state of your objects without your knowledge.You’ve got four different strategies for protecting your internal data structuresfrom unintended modifications: value t 阅读全文

摘要： Events provide a standard syntax for notifying listeners. The .NET EventPattern follows the event syntax to implement the Observer Pattern. Anynumber of clients can attach handlers to the events and process them.Those clients need not be known at compile time. Events don’t need subscribersfor 阅读全文

摘要： Apple decided to make this type of application extremely easy to write: NSArrayControllerwill hold on to an array of objects. Bindings will eliminate much of the glue code that would be necessary to keep the model objects in sync with the views. NSManagedObjectContextwill observe the instance v 阅读全文

摘要： The key() function returns a node-set from the document, using the index specified by an <xsl:key> element.cdcatalog.xmlCode highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--1<?xmlversion="1.0"encoding="ISO-8859-1"?>2<!--EditedbyXMLSpy® 阅读全文

摘要： One protocol is NSCoding. If your class implements NSCoding, it promises to implement the following methods: An NSCoderis an abstraction of a stream of bytes. You can write your data to a coder or read your data from a coder. TheinitWithCoder:method in your object will read data from the coder a 阅读全文

摘要： DocumentCode highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--1//2//MyDocument.m3//RaiseMan4//5//Createdbyb1mobileon2/14/11.6//Copyright2011__MyCompanyName__.Allrightsreserved.7//89#import"MyDocument.h"10#import"Person.h"1112@implementationMyDocument1314-( 阅读全文

摘要： Delegates provide the best way to utilize callbacks at runtime, with simplerrequirements on client classes. You can configure delegate targets at runtime.You can support multiple client targets. Client callbacks should beimplemented using delegates in .NET. 阅读全文