Joel Pobar Language Geek Microsoft DEV320

Improve on C# % Backwards Compatible Language Integrated Query (LINQ)

C# 3.0C# 3.0 VB 9.0VB 9.0 OthersOthers.NET Language Integrated Query LINQ to Objects LINQ to DataSets LINQ to SQL LINQ to Entities LINQ to XML Objects XML Relational

Project Select, Return Select, Return Filter Where, Distinct Test Any( ), All( ) Join Join On = Join On = Group Group By, Aggregate, Group By, Aggregate, Group Join On = Aggregate Group Join On = Aggregate Aggregate Count( ), Sum( ), Min( ), Max( ), Avg( ), Group( )… Partition Skip [ While ], Take [ While ] Skip [ While ], Take [ While ] Set Union, Intersect, Except Order Order By, Order By,

Local Variable Type Inference Object Initializers Collection Initializers Anonymous Types Auto-Implemented Properties Extension Methods Lambdas Query Expressions Expression Trees Partial Methods Implicitly-Typed Arrays

Motivation Language Integrated Query C# 3.0 New Language Features

Technical Communities, Webcasts, Blogs, Chats & User Groups Microsoft Developer Network (MSDN) & TechNet Trial Software and Virtual Labs Microsoft Learning and Certification Visual C# Developer Center Visual Studio 2008 Beta1 Download Page Visual Studio 2008 Samples

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BinaryExpression ConstantExpression FuncletExpression InvocationExpression LambdaExpression MemberExpression MethodCallExpression NAryExpression NewArrayExpression NewExpression ParameterExpression TernaryExpression TypeBinaryExpression UnaryExpression

Expression: “a + b” ParameterExpression a = Expression.Parameter(typeof(int), "a"); ParameterExpression b = Expression.Parameter(typeof(int), "b"); BinaryExpression add = Expression.Add(a, b); Expression > l = Expression.Lambda >(add, a, b); Console.WriteLine(DoBinOp(l, 1, 2));

Param“a”Param“a” Param“b”Param“b” Binary “Add”