What are some common extension methods used in LINQ?

LINQ (Language-Integrated Query) is a powerful feature in C# that allows you to query various data sources using a unified syntax. Extension methods in LINQ provide additional functionality to the existing LINQ operators and enable you to create custom queries. Here are some common extension methods used in LINQ:

Where: Filters a sequence of elements based on a specified condition.

IEnumerable<T> Where<T>(this IEnumerable<T> source, Func<T, bool> predicate)

Select: Transforms each element of a sequence into a new form.

IEnumerable<TResult> Select<T, TResult>(this IEnumerable<T> source, Func<T, TResult> selector)

OrderBy/OrderByDescending: Sorts the elements of a sequence in ascending or descending order based on a key.

IOrderedEnumerable<T> OrderBy<T, TKey>(this IEnumerable<T> source, Func<T, TKey> keySelector)
IOrderedEnumerable<T> OrderByDescending<T, TKey>(this IEnumerable<T> source, Func<T, TKey> keySelector)

GroupBy: Groups the elements of a sequence based on a specified key.

IEnumerable<IGrouping<TKey, T>> GroupBy<T, TKey>(this IEnumerable<T> source, Func<T, TKey> keySelector)

Join: Performs an inner join on two sequences based on matching keys.

IEnumerable<TResult> Join<TOuter, TInner, TKey, TResult>(this IEnumerable<TOuter> outer, IEnumerable<TInner> inner, Func<TOuter, TKey> outerKeySelector, Func<TInner, TKey> innerKeySelector, Func<TOuter, TInner, TResult> resultSelector)

Any: Determines whether any element of a sequence satisfies a specified condition.

bool Any<T>(this IEnumerable<T> source, Func<T, bool> predicate)

All: Determines whether all elements of a sequence satisfy a specified condition.

bool All<T>(this IEnumerable<T> source, Func<T, bool> predicate)

First/FirstOrDefault: Returns the first element of a sequence or a default value if the sequence is empty.

TSource First<TSource>(this IEnumerable<TSource> source)
TSource FirstOrDefault<TSource>(this IEnumerable<TSource> source)

Last/LastOrDefault: Returns the last element of a sequence or a default value if the sequence is empty.

TSource Last<TSource>(this IEnumerable<TSource> source)
TSource LastOrDefault<TSource>(this IEnumerable<TSource> source)

Count: Returns the number of elements in a sequence.

int Count<TSource>(this IEnumerable<TSource> source)

These are just a few examples of common LINQ extension methods. LINQ provides a wide range of operators to perform various operations on collections and query data from different sources in a concise and expressive manner.

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