Complete Practical LINQ Tutorial in C# (The Course)
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Course Info

This course includes 1 attempt.

Extension methods were introduced in C# 3 and since then became an indispensable part of the .NET platform. That enormously powerful feature allowed to build a whole framework built upon it called LINQ or Language Integrated Query. I’ve seen many code bases which avoid using LINQ and rely on old procedural style of programming. If you still feel yourself uncomfortable with LINQ or you want to improve your understanding of LINQ, then this course is for you. As you might know, LINQ was inspired by functional paradigm and F# in particular. So, this course is not only about LINQ but about the fundamentals of functional programming as well.

This course covers:

  • The basics of LINQ: extension methods, the idea of pipelining, IEnumerable, implementing our own extension, query syntax, pitfalls of LINQ operations, how to alter a list
  • Generating data streams: Enumerable class and its main operations, implementing your own extension which generates a stream of data
  • Filtering, Ordering, Projecting: Parsing a CSV file, ThenBy, First, Last, Single, TakeWhile, SkipWhile,Any, All, Contains, SequenceEqual, Select and SelectMany
  • Joining, Grouping, Aggregating: Join, Group, GroupJoin, Zip, Sum, Average, Min, Max
  • Conversions: OfType, Cast, ToArray, ToList, ToDictionary, ToLookup, AsEnumerable, AsQueryable
  • LINQ to XML: overview, generating XML from a collection, reading XML
  • EF and LINQ: Expression Trees, Inserting into and Reading from a database
  • Extendibility in C#: what is functional programming (FP), purity and side effects, extending IDisposable, general-purpose extensions, extending StringBuilder, Primitive Obsession

In short, this is a great course, so enroll right now and start learning LINQ and the fundamentals of functional programming.


Course Material

  • Introduction to LINQ
  • Outline
  • LINQ is Everywhere
  • Extension Methods
  • Pipelining
  • Why LINQ
  • The Role of IEnumerable
  • Extending IEnumerable
  • Parsing a .csv File
  • Named vs Anonymous vs Separate Methods
  • Query Syntax
  • Yield Return
  • LINQ Deferred Execution
  • Exceptions and LINQ
  • Multiple Enumeration Pitfall
  • Altering List
  • Conclusion
  • Generating Data Streams
  • Outline
  • Range-Repeat-Empty
  • Generating Random Numbers
  • Conclusion
  • Filtering, Ordering, Projecting
  • Outline
  • Select
  • Where
  • ThenBy
  • First, Last, Single, OrDefault
  • TakeWhile and SkipWhile
  • SequenceEqual
  • Distinct
  • Any, All, Contains
  • SelectMany
  • ElementAt and Counting
  • Conclusion
  • Joining, Grouping, Aggregating
  • Outline
  • Join
  • GroupBy
  • GroupJoin
  • Zip
  • Min, Max, Sum, Average
  • Concat and Union
  • Intersect and Except
  • Conclusion
  • Conversions
  • Outline
  • OfTypeCast
  • ToArray, ToList, ToDictionary, ToLookup
  • Pitfalls of Conversion
  • Conclusion
  • LINQ to XML
  • Outline
  • XML Document Structure
  • Creating XML from a Collection
  • Refactoring Code
  • Reading XML
  • Conclusion
  • LINQ to Entities
  • Outline
  • Preparing the Project
  • Inserting & Reading
  • Pitfalls of LINQ to Entities
  • Expressions, AsEnumerable and AsQueryable
  • Conclusion
  • Extendibility in C
  • Outline
  • Defining Functional Programming
  • Functions Are Everywhere
  • Why Functional Programming
  • Immutability
  • Purity and Side Effects
  • Extending IDisposable
  • General Extensions
  • Extending StringBuilder
  • Primitive Obsession
  • Conclusion


    • I'm thankful enough for that I love what I do.

      I began my career as a postgraduate student participating in Microsoft ImagineCup contest.

      I've been working with .NET platform since 2003. I've been professionally architecting and implementing software for more than 10 years, primarily based on the .NET platform. I'm passionate about building rich and powerful applications using modern technologies. I'm a certified specialist in Windows Applications and Service Communication Applications by Microsoft. I'm one of the coordinators of the MskDotNet User Group in Moscow.

      "If it's work, we try to do less. If it's art, we try to do more." - Seth Godin.

      What I can say is that software is my art.

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