#28 BATON ROUGE

.NET FundamentalsMike Huguet

Solutions Architect for BRDNUG leader, http://brdnug.org MS Patterns & Practices SP Guidance

Advisor SQLSat28 Organizer

http://twitter.com/mhuguet http://geekswithblogs.com/mikehuguet

Mike Huguet

A.K.A – “Huggy” Bear What does he do anyway? Favorite restaurant is any $5 Chinese Buffet He only quotes movies from the 80’s

Alternate Intro

Introduce some of the “new” fundamentals Enhance knowledge of these fundamentals

Objectives

Face.Expression !=

Feature Timeline

2006 2007 2010

3.0 3.5 4.02.0

2008

3.5 SP1

Generics

• Extensions• Lambdas• LINQ

2005

Language specific implementation / syntax Compiler and IDE magic Increase productivity and readability /

reduce code

What’s in Common

?Generics

“Generics let you tailor a method, class, structure, or interface to the precise data type it acts upon.”

- MSDN

Generics

- MSDN

Native to the CLR Allow for better type safety increasing

performance (no box, unbox, casting)◦ ArrayList vs. List<T>

IDE Magic

What are Generics?

*200% perf gain value types (i.e.-string, int…)

*100% perf gain ref types (i.e.-MyClass) Used throughout .NET Make great containers

◦ i.e.-List<T> Activator.CreateInstance<T>()

Uses / Benefits

* - #’s from MSDN

C#◦ List<string> x = new List<string>();◦ String GetValueAsString<T>(T entity) {}

VB.NET◦ Dim x As New List(Of String)◦ Function GetValueAsString(of T)(ByRef entity As T) As String

Syntax

Demo

Derivation Constraints◦ class Repo<T> where T : BaseEntity◦ class Repo<T> where T : BaseEntity, IComparable<T>◦ class Repo<T, K> where T : BaseEntity

where K : IValidator

Reference/Value Type Constraints◦ class Repo<T> where T : class◦ class Repo<T> where T : struct

Constructor Constraints◦ class Repo<T> where T : class, new()

Constraints (C#)

Derivation Constraints◦ Class Repo(Of T As BaseEntity)◦ Class Repo(Of T As {BaseEntity, IComparable(Of T)})◦ Class Repo(Of T As BaseEntity, K As IValidator))

Reference/Value Type Constraints◦ Class Repo(Of T As Class)◦ Class Repo(Of T As Structure)

Constructor Constraints◦ Class Repo(Of T As New, Class)

Constraints (VB.NET)

?Extension Methods

“Extension methods enable you to ‘add’ methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type.”

-MSDN

Allows adding methods to an existing type No recompile needed Can extend framework classes (including

sealed) Methods included in Intellisense

Extension Methods

Demo

?Lamda Expressions

“A lambda expression is an anonymous function that can contain expressions and statements, and can be used to create delegates or expression tree types.”

-MSDN

Shorthand for a function A variable that points to function Anonymous function (no name) Returns a single value Explicit or inferred types

Return Parameter(s)

What is a Lambda Anyway?

C# Arg list => expression x => x + 1 (x, y) => x == y

VB.NET Function(x) x + 1 Function(x, y) x = y

Syntax Examples

Summary - Wherever a delegate type can be used

Event handlers LINQ Projection Extensions (Select, SelectMany) Find Extensions (Find, FindAll)

When Can We Use Them?

Demo

?Language Integrated Query (LINQ)“LINQ is a set of extensions to the .NET

Framework that encompass language-integrated query, set, and transform operations. .”

-MSDN

Core functionality provided by extension methods (method based)◦ Any()◦ Where()◦ OrderBy()◦ ThenBy()◦ Contains()◦ Join()◦ First()...

LINQ

Expression basedvar results = from process in Process.GetProcesses() where process.ProcessName.Contains("WINWORD") orderby process.MainWindowTitle descending select process;

Method based var results = Process.GetProcesses()

.Where(process=>process.ProcessName .Contains("WINWORD")) .OrderBy(x=>x.MainWindowTitle);

LINQ Options

Demo

LINQ

.NET Language – Integrated Query

C# VBOther

Languages

LINQ to Objects LINQ to

DatasetsLINQ to

SQLLINQ to Entities

LINQ to XML

Relational Data

XMLObjec

ts

LINQ enabled ADO.NET

LINQ enabled data sources

LINQ to … LINQ to Objects LINQ to XML (XLINQ) LINQ to DataSets LINQ to SQL (DLINQ) LINQ to Entities (EF) LINQ to SharePoint LINQ to REST LINQ to NHibernate LINQ to Twitter LINQ to SQL Saturday???

Feature Timeline

2006 2007 2010

3.0 3.5 4.02.0

2008

3.5 SP1

Generics

• Extensions• LINQ• Lambdas

2005

Key Takeaways Rich productivity improvements in the

framework and languages More to explore and learn LINQ is built on all of these You know that you want to roll your own

LINQ provider & “Extend it”

@SQL Saturday #28

Baton Rouge.NET FundamentalsMike Huguet - @mhuguet- mike.huguet@sparkhound.com