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C#入门教程ppt
Ruby for C# Developers Cory Foy Overview What is Ruby? Ruby Basics Advanced Ruby Ruby and .NET integration Wrap-up What is Ruby? First released in 1995 by Yukihiro Matsumoto (Matz) Object-Oriented number = 1.abs #instead of Math.abs(1) Dynamically Typed result = 1+3 What is Ruby? /faq/entry/show/3 Will It Change Your Life? Yes! Ok, Maybe It’s fun to program with And what is programming if it isn’t fun? Ruby Basics Variables, Classes and Methods Properties / Attributes Exceptions Access Control Importing Files and Libraries Duck Typing Ruby Basics - Variables Local (lowercase, underscores) fred_j = Person.new(“Fred”) Instance (@ sign with lowercase) @name = name Class (@@ with lowercase) @@error_email = “testing@” Constant (Starts with uppercase) MY_PI = 3.14 class Move Global ($ with name) $MEANING_OF_LIFE = 42 Ruby Basics - Classes Class definitions are started with class,are named with a CamelCase name, and ended with end Ruby Basics - Classes Attributes and fields normally go at the beginning of the class definition Ruby Basics - Classes initialize is the same concept as a constructor from .NET or Java, and is called when someone invokes your object using Move.new to set up the object’s state Ruby Basics - Methods Methods return the last expression evaluated. You can also explicitly return from methods Ruby Basics - Methods Methods can take in specified parameters, and also parameter lists (using special notation) Ruby Basics - Methods Class (“Static”) methods start with either self. or Class. Ruby Basics - Properties Like .NET, Ruby supports the concept of Properties (called Attributes) Ruby Basics - Properties Unlike .NET, Ruby provides convenience methods for doing this Ruby Basics - Properties You can specify read or write only attributes as well Ruby Basics - Exceptions Ruby has an Exception hierarchy Exceptions can be caught, raised and handled You can also easily retry a block of code when you encounter an exception Ruby Basics - Exceptions Ruby Basics –
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