using System;

using System.Linq;

using System.Collections;

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/* Filtering Operator - OfType

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The OfType operator filters the collection based on the ability to cast an element in a collection to a specified type.

OfType in Query Syntax:

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Use OfType operator to filter the above collection based on each element's type */

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public class Program

{

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    public static void Main()

    {

        // Example: OfType operator in C#

        IList mixedList = new ArrayList();

        mixedList.Add(0);

        mixedList.Add("One");

        mixedList.Add("Two");

        mixedList.Add(3);

        mixedList.Add(new Student() { StudentID = 1, StudentName = "Bill" });

        var stringResult = from s in mixedList.OfType<string>()

                           select s;

        var intResult = from s in mixedList.OfType<int>()

                           select s;

        var stdResult = from s in mixedList.OfType<Student>()

                           select s;

        foreach (var str in stringResult)

            Console.WriteLine(str);

        foreach (var integer in intResult)

            Console.WriteLine(integer);

        foreach (var std in stdResult)

            Console.WriteLine(std.StudentName); /* 

        -------------------------------------------------------

​

​

        -------------------------------------------------------

        OfType in Method Syntax:

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        You can use OfType<TResult>() extension method in linq method syntax as shown below.

        Example: OfType in C# */

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        var stringResult2 = mixedList.OfType<string>();

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        foreach (var str in stringResult2)

            Console.WriteLine(str); /* 

        ------------------------------------------------------- 

​

​

        ------------------------------------------------------- 

        Points to Remember :

            The Where operator filters the collection based on a predicate function.

            The OfType operator filters the collection based on a given type

            Where and OfType extension methods can be called multiple times in a single LINQ query.

        ------------------------------------------------------- 

​

        */

​

    }

}

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public class Student{

​

    public int StudentID { get; set; }

    public string StudentName { get; set; }

    public int Age { get; set; }

}