How to use LINQ query operators ?

LINQ standard query operator defined by the Enumerable class:

Filtering Operators

Where

OfType

Projection Operators

Select

SelectMany

Sorting Operators

OrderBy

ThenBy

OrderByDescending

ThenByDescending

Reverse

Join Operators

Join

GroupJoin

Grouping Operators

GroupBy

ToLookup

Quantifier Operators

Any

All

Contains

Partitioning Operators

Take

Skip

TakeWhile

SkipWhile

Set Operators

Distinct

Union

Intersect

Except

Zip

Element Operators

First

FirstOrDefault

Last

LastOrDefault

ElementAt

ElementAtOrDefault

Single

SingleOrDefault

Aggregate Operators

Count

Sum

Min

Max

Average

Aggregate

Conversion Operators

ToArray

AsEnumerable

ToList

ToDictionary

Cast

Generation Operators

Empty

Range

Repeat

Hey Programmers/developers/Engineers,

Write queries using these operators and share concepts of LINQ.

Filtering Operators

1.      object[] data = {"one", 2, 3, "four", "five", 6};
           var query = data.OfType();
           foreach(var s in query)
          {
                Console.WriteLine(s);
          }

2.        var names = new List { "Nino", "Alberto", "Juan", "Mike", "Phil" };
            var namesWithJ = from n in names
                                             where n.StartsWith("J")
                                             orderby n
                                             select n;

The Generation operators Range(), Empty(), and Repeat() are not extension methods but normal static methods that return sequences. With LINQ to objects, these methods are available with the Enumerable class.

var values = Enumerable.Range(1,20).Select(n => n * 3);