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LINQ An Introduction

Posted By: rakesh On:7/21/2010 6:29:28 AM in:Articles Category:LINQ Hits:1764
C# 3.0. LINQ (Language Integrated Query) extends the query capabilities of c# and Visual Basic in terms of querying and updating data using language syntax on any kind of data store. With Orcas the data stores mainly supported are in-memory objects, XML , SQL Server db objects, ADO.NET datasets. In future LINQ will also support querying on Entities exposed as part of ADO.NET Entity framework.

Introduction

C# 3.0. LINQ stands for Language Integrated Query  extends the query capabilities of c# and Visual Basic in terms of querying and updating data using language syntax on any kind of data store. With Orcas the data stores mainly supported are in-memory objects, XML , SQL Server db objects, ADO.NET datasets. In future LINQ will also support querying on Entities exposed as part of ADO.NET Entity framework.

It supports compile time checking for syntax errors and type safety.

LINQ provides complete query language for any collection that implements IEnumerable<T> or IQueryable<T>. For in-memory objects to be enabled for LINQ, the object type should implement IEnumerable<T>. For LINQ to XML, SQL and Datasets the underlying provider converts the target objects to IEnumerable based collections.

Let’s see LINQ in action. Currently the most recommended way of trying LINQ id Beta 1 of Orcas which has LINQ framework integrated with it.

Consider the program below :

Code

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. namespace HelloWorld
  6. {
  7. class Program
  8. {
  9. static void Main(string[] args)
  10. {
  11. string[] words = new string[5] { "Word1", "World", "Word2", "Word3", "Word4" };
  12. IEnumerable<string> wordQuery =
  13. from word in words
  14. where word == "World"
  15. select word;
  16. foreach (string name in wordQuery)
  17. {
  18. Console.WriteLine("Hello " + name);
  19. }
  20. }
  21. }
  22. }
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Rakesh Sinha
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