Download PDF by Marco Russo: Programming Microsoft® LINQ in Microsoft .NET Framework 4

By Marco Russo

ISBN-10: 0735640572

ISBN-13: 9780735640573

Dig into LINQ -- and rework how you paintings with info.

With LINQ, you could question facts from a number of resources -- together with databases, gadgets, and XML documents -- at once from Microsoft visible simple® or C#. Guided by way of data-access specialists who have labored extensive with LINQ and the Microsoft improvement groups, you are going to learn the way .NET Framework four implements LINQ, and the way to take advantage of it. transparent examples make it easier to convey your personal data-access options speedier and with leaner code.

become aware of find out how to:

  • Use LINQ to question databases, item collections, arrays, XML, Microsoft Excel® documents, and different assets
  • Apply LINQ most sensible practices to construct data-enabled .NET functions and prone
  • Manipulate facts in a relational database with ADO.NET Entity Framework or LINQ to SQL
  • Read, write, and deal with XML content material extra successfully with LINQ to XML
  • Extend LINQ to aid extra information resources by way of developing customized operators and companies
  • Examine different implementations, akin to LINQ to SharePoint®
  • Use LINQ in the info, enterprise, and repair layers of a disbursed software
  • Get code samples on the internet

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Extra info for Programming Microsoft® LINQ in Microsoft .NET Framework 4

Example text

More Info You w find more nformat on about LINQ to XML syntax and ts potent a n Chapter 12, “LINQ to XML Manag ng the XML Infoset” and n Chapter 13, “LINQ to XML Query ng Nodes ” Language Integration Language integration is a fundamental aspect of LINQ. 0 and Visual Basic 2008. With it, you can write code such as you’ve seen earlier. City } ); Many people call this simplification syntax sugaring because it is just a simpler way to write code that defines a query over data. However, there is more to it than that.

Language == "C#" 26 Part I LINQ Foundations The language compilers translate these clauses into invocations of extension methods that are sequentially applied to the target of the query. dll, defines a set of extension methods grouped by target and purpose. Linq, which defines extension methods that can be applied to instances of types implementing the IEnumerable interface. The filtering condition (where) defined in the sample query translates into an invocation of the Where extension method of the Enumerable class.

Many others use stored procedures to insert, update, or delete data and dynamically build SELECT statements to query data. Some see the database as a simple object persistence layer, whereas others put some business logic into the database by using triggers, stored procedures, or both. LINQ tries to offer help and improvement in database access without forcing everyone to adopt a single comprehensive model. 22 Part I LINQ Foundations More Info The use of any LINQ to ADO NET mp ementat on depends on the nc us on of part cu ar namespaces n the scope Part II, “LINQ to Re at ona ,” nvest gates LINQ to ADO NET mp ementat ons and s m ar deta s LINQ to XML You’ve already seen that LINQ to XML offers a slightly different syntax that operates on XML data, allowing query and data manipulation.

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Programming Microsoft® LINQ in Microsoft .NET Framework 4 by Marco Russo

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