Ken Casada Developer Evangelist Microsoft Switzerland

Lap around C# 3.0 Enhancements (Demo) The LINQ Project LINQ flavor (Demo) LINQ to Object LINQ to DataSet LINQ to XML (LINQ to SQL)

Automatic properties Object Initializers Collection Initializers Extension Methods Anonymous Types Lambda Expressions Query Expression

Data != Objects

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

DataSets fully integrated with LINQ Both typed and un-typed DataSets will work Do joins, grouping, etc over Data in DataTables Can create view that span multiple DataTables

Language integrated query for XML Designed to make XML usable without learning specialized technologies such as XPath/XSLT Construct and query XML data with fewer lines of code Builds on top the standard LINQ query commands Compose query expressions with multiple data stores Visual Basic 9 has additional XML capabilities XML literals – XML supported directly in language Property-like XML support– simple queries using conventional VB syntax

TodayXmlDocument doc = new XmlDocument(); XmlElement contacts = doc.CreateElement("contacts"); foreach (Customer c in customers) if (c.Country == "USA") { XmlElement e = doc.CreateElement("contact"); XmlElement name = doc.CreateElement("name"); name.InnerText = c.CompanyName; e.AppendChild(name); XmlElement phone = doc.CreateElement("phone"); phone.InnerText = c.Phone; e.AppendChild(phone); contacts.AppendChild(e); } doc.AppendChild(contacts); Great Food …

XElement contacts = new XElement("contacts", from c in customers where c.Country == "USA“ select new XElement("contact", new XElement("name", c.CompanyName), new XElement("phone", c.Phone) ) ); Great Food …

Provides object-to-relational mapping within the.NET Framework for Microsoft SQL Server databases Access relational data as strongly typed objects using LINQ query expressions Language integrated data access Tables and rows to classes and objects For Change Tracking Performance, … … have a look at the following session Real world LINQ to SQL: the Good, the Bad and the Ugly

Application SQL Server LINQ to SQL from c in db.Customers where c.City == "London" select c.CompanyName LINQ Query SQL Query SELECT CompanyName FROM Cust WHERE City = 'London' Rows ObjectsSubmitChanges() DML or Stored Procedures db.Customers.Add(c1); c2.City = “Seattle"; db.Customers.Remove(c3); INSERT INTO Customers… UPDATE Customers … DELETE FROM Customers …

MSDN Developer Center LINQ Forum Channel9 Linq Videos Blogs Scott Guthrie feature-query-syntax.aspx Charlie Calvert LINQ HOL C# 3.0 Enhancements & LINQC# 3.0 Enhancements & LINQ (English)

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