In this tutorial, I am going to discuss query operators in linq. query operators are categorized as per following criteria.

1. Input sequence(s) result in an output sequence.
2. Input sequence results in scalar value/single element output.
3. No input results in an output sequence (these operators generate their own elements).

Types of LINQ operators

• Restriction: Where
• Projection: Select, SelectMany
• Partitioning: Take, Skip, TakeWhile, SkipWhile
• Ordering: OrderBy, OrderByDescending, ThenBy, ThenByDescending, Reverse
• Grouping: GroupBy
• Set: Concat, Union, Intersect, Except
• Conversion: ToArray, ToList, ToDictionary, ToLookup, OfType, Cast  Element: First, FirstOrDefault, Last, LastOrDefault, Single, SingleOrDefault, ElementAt, ElementAtOrDefault, DefaultIfEmpty
• Generation: Empty, Range, Repeat
• Quantifiers: Any, All, Contains, SequenceEqual
• Aggregate: Count, LongCount, Sum, Min, Max, Average, Aggregate
• Joining: Join, GroupJoin, Zip