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Programming in C# Jump StartJerry Nixon | Microsoft Developer EvangelistDaren May | President & Co-founder, Crank211

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07 | Advanced C#, Part 3Jerry Nixon | Microsoft Developer EvangelistDaren May | President & Co-founder, Crank211

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Interacting with the File System Working with REST Services

Module Overview

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MVA

Interacting with the File System

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Show existing data to user Integrate user-provided data Serialize objects out of memory Persist data across sessions Determine environment configuration

Why read or write to the file system?

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This is simplified with Framework methods; open / sh

File.WriteAllText / ReadAllText Open for reading to keep open and keep writing Open as stream for large payloads and realtime proc

How do we write to files? (027)

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Get Windows folder with Environment Special Folders Get the Current folder with File.IO Get Current Direct Use Isolated Storage dedicated to the current applica Anything Else. Caveat: Windows Store App developm

How do we find files? (027)

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Iterate through files using GetFiles() Rename / Move with System.IO methods Get File Info with Syetem.UI.FileInfo

How do we modify files? (027)

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MVA

Leveraging Web Services

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Web Services encapsulate implementation Web Services expose to disparate system Web Services allow client systems to communicate se

Web protocols (HTTP, GET, POST, etc)

Web Services are important to Service Oriented Arch With and without metadata

Loose coupling

What are Web Services?

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SOAP is a standard for returning structured data fromService as XML Envelope

Header

Body

SOAP handling is a built-in feature of Visual Studio

What is SOAP?

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REST is becoming a common, industry standard REST does not require XML parsing REST does not require a message header REST is generally human-readable REST uses less bandwidth thank SOAP REST services typically return XML or JSON JSON is JavaScript Object notation

JSON is becoming a common, industry standard

JSON is generally a lighter payload than XML (or SOAP)

What is REST?

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REST Services and Serialization

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MVA

Asynchronous Programming

Wh t i h i ?

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Asynchronous maximizes resources on multicore systallowing units of work to be separated and complete

Asynchronous programming frees up the calling systespecially a user interface, as to not wait for long ope

What is asynchronous programming?

Wh t i th C# ASYNC/AWAIT k d

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Async and await simplify asynchronous programming Async and await allow asynchronous code to resembstructure of synchronous code. Methods marked with async may return Task. The async keyword instructs the compiler to allow aw The await keyword instructs the method to return. The await keyword instructs the compiler to resume ewithin the same context after the operation is comple

What is the C# ASYNC/AWAIT keywords

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Mod le Recap

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Interacting with the File System Working with REST Services

Module Recap

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2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, Office, Azure, System Center, Dynamics and other product names are or may be registered trathe U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee tprovided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTA