How to Use Extension Methods of Predication types?

Yes,In .net Framework we will see some of the extension methods using now

Ex1:

 class BasicDemo
    {
        static void Main()
        {
            int[] intarr = new int[4];
            intarr[0] = 15;
            intarr[1] = 22;
            intarr[2] = 89;
            intarr[3] = 104;

            int i=intarr.ElementAt<int>(1);
            Console.WriteLine(i);          //---22
            int value = intarr.ElementAtOrDefault<int>(2);
            Console.WriteLine(value);      //89

            int maxvalue1 = intarr.Max<int>();
            Console.WriteLine(maxvalue1);  // 104          
            Console.Read();       
        }
    }

Ex2:

class ExtensionMethod

    {

        static void Main()

        {

            int[] intarr = new int[5];

            intarr[0] = 15;

            intarr[1] = 80;

            intarr[2] = 25;

            intarr[3] = 30;

            intarr[4] = 14;

            Array.Sort<int>(intarr);   // Extinsion method

            Console.WriteLine(intarr);

            foreach (int item in intarr)

            {

                Console.WriteLine(item);

            }

            Console.WriteLine("-----------");        

            int i = intarr.First<int>();

            Console.WriteLine(i);

  Console.WriteLine("-----preparing precate to our expression-------");

        string[] str = new string[] { "anand", "balu", "chran", "dinesh" };

  Func<string, bool> abac = x => x.Length > 4;

// 1st parameter is type,    

// 2nd parameter returns Source[result]

      // abac is predicate of Fun<string,bool> type.

       string strr=str.First<string>(abac);  // HERE abac is predicate.           

            Console.WriteLine(strr);                

            int[] intarem = new int[4] { 5, 6, 7, 8 };

            Func<int,bool> funss= x=>x >7;

            int m = intarem.First<int>(funss);  //predicate passing to funcation  

            Console.WriteLine(m);

            int[] arrint = new int[3] { 47, 98, 58 };

            int value = arrint.First<int>(s => s > 50);

            Console.WriteLine(value);

            Console.ReadKey();       

        }

    }

Yes,We have many Extension methods in .net framework.we will see some of extension methods,and as well as

Parameters of Fun<int,bool> of Fun<T,TSource> of type

And

Parameters of Fun<T>.First() and Fun<T>.First(delegate)

Here delegate-àFun<T,Tsource>--àan lamda expression.

Note:Predicate means one condition[we are writing it as a lamda expression] to Sort/filter/check for our requirement from remaing elements.