The Complete Course of LINQ and C# Programming

Explore how LINQ in the C# standard library operates on collections with deferred execution, and introduce database integration with entity framework and relational mapping, including pagination and filtering.

Download Visual Studio Community edition, install .NET and web development workload, choose a console app targeting .NET 6, create a project, and start practicing with sample problems and database exercises.

Explore LINQ concepts and C# collections, including lists, arrays, immutable arrays, and enumerables; learn how select and max by operate, and how lazy evaluation and iteration work.

Learn to sort data with order by and order by descending in LINQ, comparing by age or name with IComparable, and using reverse or descending in query and method syntax.

Explore maxby, minby, max, min, and average in C# LINQ, including empty-list handling with the null-forgiving operator, computing oldest and youngest ages, totals, and double values for averages.

Use where in LINQ to filter a sample list of people by name starting with a letter and by age. See how deferred execution and changes to the source affect results, and note the role of select, immutable arrays, and simple C# seven syntax additions.

Learn how select transforms a sequence by projecting to a different type, such as names or ages, and how it combines with order by and deferred execution.

Explore how to use Aggregate to combine elements in a sequence, generate ranges with Enumerable.Range, and handle empty sequences with DefaultIfEmpty, illustrated by sums, factorials, and practical examples.

Demonstrate merging two arrays with the concat function to form a single sequence, select names, and join them with a comma, while explaining that iteration triggers deferred execution.

See how the distinct function removes duplicates by using the dot equals function on records, and compare by name and age to yield unique entries.

Use sequence equal to compare two lists; it checks length and returns true only if all elements match, false if any mismatch, as shown when Luca's age differs or matches.

See how the append and prepend functions modify a list of people by adding values at the end or the beginning, with the final list updating accordingly.

Learn how to use ToList, ToArray and ToHashSet in LINQ, compare distinct versus unique values, and understand HashSet performance and equals logic.

Explore First, FirstOrDefault, Single, SingleOrDefault, Last, and LastOrDefault in LINQ with C#, noting when they throw errors versus returning defaults, and how Single differs in behavior and performance.

Explore how the dot any and all functions in LINQ evaluate a name list to yield true or false, using short-circuit checks.

Filter a list by type using OfType, and use Cast to convert items to the right type, illustrated with super person and person examples and casting errors.

Explore how the zip function merges two lists, such as names and ages, to create a new person, showing mapping via a selector and understanding zero-based indexing.

Zip combines elements from lists of different lengths by taking items up to the shortest list and ignoring the extra elements, as shown when Eric is excluded.

Explore GroupBy and ToLookup with a car catalog: group cars by company, print grouped keys and members, compare grouped results with immediate lookup and indexing for Toyota, Ford, and Tesla.

Explore how to use the ToDictionary function to map car names to objects, compare dictionary lookups with single or default, and gain faster lookups via hashing.

Learn how to paginate data with take, take last, skip, and skip last in linq, using a car list to fetch the first five, last five, and subsequent pages.

Demonstrate select with an index and the element at function to enumerate cars with numbers, and filter with where for items under forty thousand.

Explore the Enumerable.Repeat function by showing how to create a sequence that repeats an element, such as hello, a specified number of times.

See how SelectMany flattens multiple car lists into one, producing tuples of brand, company, and car. Compare it with group by and concatenate brand and product name to format results.

Explore linq set operations intersect, except, and union on two lists, including intersect by and union by for name-based matching, showing common, exclusive, and combined results.

Learn to implement iterator functions in C#, using yield return to filter and project data with where, select, first, and count, and explore max, min, and fibonacci examples.

Solve a practice problem that squares each digit of a number and concatenates the results using LINQ in C#, with examples like 33 becoming 99 and 44 becoming 1616.

Explore a naive factoring method that lists a number’s factors via mod tests and checks primality by counting factors, highlighting inefficiency for large inputs with LINQ.

Explore practical LINQ and C# problems by building tests, filtering and comparing sequences, and solving a temperature closest to zero challenge using aggregates and null handling.