009 LINQ OfType

OfType method is used to filter LINQ objects.OfType comes under System.Linq  namespace. OfType is Enumarable ,  ofTypeIEnumarable. When ofType is applied on a query, the query Returns the result, that can be cast into particular supplied type.Object that cannot be cast into the supplied type will be discarded automatically.ofType a generic method, it takes type as parameter, that has to be filtered. 
 
Here is the OfType example ,the list is filtered against
String , Decimal ,Integer

Eample

using System;

using System.Collections.Generic;

using System.Data.SqlClient;

using System.Data.Sql;

using System.Data;

using System.Linq;

using System.Collections;

using System.Xml;

using System.Xml.Linq;

using System.IO;

namespace ConsoleApplication1

{

                  class Program

                 {

                   static void Main(string[] args)

                    {

                             IList myList = new ArrayList();

                            myList.Add("India");

                            myList.Add(false);

                            myList.Add(12);

                            myList.Add(true);

                            myList.Add(13);

                            myList.Add("USA");

                            myList.Add("Pakistan");

                           myList.Add(15);

                           myList.Add(true);

                           myList.Add("South Afrika");

                           myList.Add("Russia");

                          /********filtering string object*************/

                           var strqery = from s in myList.OfType<string>()

                                                   select s;

                             Console.WriteLine("*************List of String object*************");

                                                  foreach (object c in strqery)

                                                    {

                                                         Console.WriteLine(c.ToString());

                                                    }

                       /********filtering integer object*************/

                        var intqery = from s in myList.OfType<int>()

                                                select s;

                       Console.WriteLine("*************List of Integer object*************");

                     
                       foreach (object c in intqery)

                        {

                                 Console.WriteLine(c.ToString());

                        }

                     /********filtering decimal object*************/

                     Console.WriteLine("*************List of Decimal object*************");

                     var decqery = from s in myList.OfType<bool>()

                                              select s;

                      foreach (object c in decqery)

                     {

                               Console.WriteLine(c.ToString());

                      }

                        Console.ReadKey();

            }

      }

}

Output:

*************List of String object*************
India
USA
Pakistan
South Afrika
Russia
*************List of Integer object*************
12
13
15
*************List of Decimal object*************
False
True
True