Microsoft Visual C# Under the Covers: In-Depth C# 3.0Joel PobarLanguage GeekMicrosoft

DEV320

C# 3.0 Design Themes

Improve on C#2.0

100% Backwards Compatible

Language Integrated Query (LINQ)

C# 3.0 Features

demo

Data != Objects

The LINQ ProjectC# 3.0 VB 9.0 Others

.NET Language Integrated Query

LINQ toObjects

LINQ toDataSet

sLINQ to

SQLLINQ toEntities

LINQ toXML

Objects

<book> <title/> <author/> <year/> <price/></book>

XML

Relational

Building LINQ

demo

Query ExpressionsProject Select <expr>, Return <expr>Filter Where <expr>, DistinctTest Any(<expr>), All(<expr>)Join <expr> Join <expr> On <expr> = <expr>Group Group By <expr>, <expr> Aggregate <expr>,

<expr>Group Join <decl> On <expr> = <expr> Aggregate <expr>

Aggregate

Count(<expr>), Sum(<expr>), Min(<expr>), Max(<expr>), Avg(<expr>), Group(<expr>)…

Partition Skip [ While ] <expr>, Take [ While ] <expr>Set Union, Intersect, ExceptOrder Order By <expr>, <expr>

C# 3.0 – New FeaturesLocal Variable Type InferenceObject Initializers

Collection InitializersAnonymous Types

Auto-Implemented PropertiesExtension MethodsLambdasQuery ExpressionsExpression TreesPartial MethodsImplicitly-Typed Arrays

Summary

Motivation

Language Integrated Query

C# 3.0 New Language Features

ResourcesTechnical Communities, Webcasts, Blogs, Chats & User Groupshttp://www.microsoft.com/communities/default.mspx

Microsoft Developer Network (MSDN) & TechNet http://microsoft.com/msdn http://microsoft.com/technet

Trial Software and Virtual Labshttp://www.microsoft.com/technet/downloads/trials/default.mspx

Microsoft Learning and Certificationhttp://www.microsoft.com/learning/default.mspx

Visual C# Developer Centerhttp://msdn2.microsoft.com/en-us/vcsharp/default.aspx

Visual Studio 2008 Beta1 Download Pagehttp://msdn2.microsoft.com/en-us/vstudio/aa700831.aspx

Visual Studio 2008 Sampleshttp://msdn2.microsoft.com/en-us/bb330936.aspx

Evaluation Forms

Questions?

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The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because 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 the accuracy of any information provided after

the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

Expression Tree'sBinaryExpressionConstantExpressionFuncletExpressionInvocationExpressionLambdaExpressionMemberExpressionMethodCallExpressionNAryExpressionNewArrayExpressionNewExpressionParameterExpressionTernaryExpressionTypeBinaryExpressionUnaryExpression

Expression Tree’s

Expression: “a + b”

ParameterExpression a = Expression.Parameter(typeof(int), "a");

ParameterExpression b = Expression.Parameter(typeof(int), "b");

BinaryExpression add = Expression.Add(a, b);Expression<Func<int,int,int>> l =

Expression.Lambda<Func<int,int,int>>(add, a, b);

Console.WriteLine(DoBinOp(l, 1, 2));

Expression Tree's

Param“a”

Param“b”

Binary“Add”