LINQ Enumerable Class Methods
The System.Linq.Enumerable class provides a set of static methods which enable to query objects that implement IEnumerable<T>. The methods of LINQ enumerable class allow to implement the standard query operators over the data source that follow the LINQ pattern at the back end. You can easily implement the LINQ based traversal, filter, and projection over the data source sequence using these standard query operator methods. Many methods in this class are defined as extension methods that extend IEnumerable<T> and enable you to call them like an instance method on any object the implements IEnumerable<T>. There are two types of method in Enumerable class, one that return singleton result and the other that return a sequence of result values. The methods, that return a result sequence, do not read the data source elements until the query object is enumerated. This type of execution is called deferred execution. Whereas the methods, that return singleton result value, consume and execute the data source immediately.
List of Linq Enumerable Class Methods
| Method | Description |
|---|---|
| Aggregate | Applies an accumulator function over the source sequence. |
| All | Finds out whether all the elements of a sequence satisfy a condition. |
| Any | Finds out whether a sequence contains any element. |
| AsEnumerable | Returns the input type as IEnumerable<T>. |
| Average | Computes the average of elements of specified sequence. |
| Cast | Converts the elements of an IEnumerable to the specified type. |
| Concat | Concatenates two sequences. |
| Contains | Finds out whether the sequence contains a specified element by using the default equality comparer. |
| Count | Returns the number of elements in a sequence. |
| DefaultIfEmpty | Returns the elements of the specified sequence or the type parameter's default value as a singleton result if the given sequence is empty. |
| Distinct | Returns the distinct elements from the sequence. |
| ElementAt | Returns the element at a specified index in a sequence. |
| ElementAtOrDefault | Returns the element at a specified index in a sequence or returns default value if the specified index is out of range. |
| Empty | Returns an empty IEnumerable<T> sequence having the specified type argument. |
| Except | Returns a set difference of two sequences by using default equality comparer. |
| First | Returns the first element of a sequence. |
| FirstOrDefault | Returns the first element of the sequence or default value if the sequence is empty. |
| GroupBy | Groups the elements of the sequence based on the specified key. |
| GroupJoin | Joins the elements of two sequences using specified equality comparison keys and groups them based on the specified group key. |
| Intersect | Returns a set intersection of two sequences by using default equality comparer. |
| Join | Combines the elements of two sequences based on the specified matching keys using default equality comparer. |
| Last | Returns the last element of a sequence. |
| LastOrDefault | Returns the last element of a sequence or returns the default value if the sequence has no element. |
| LongCount | Returns the total number of elements in a sequence. Its returns Int64 type value. |
| Max | Returns the maximum value in a sequence. |
| Min | Returns the minimum value in a sequence. |
| OfType | Filters the elements of a sequence based on a specified type. |
| OrderBy | Sorts the elements of a sequence in ascending order. |
| OrderByDescending | Sorts the elements of a sequence in descending order. |
| Range | Returns a sequence of integer numbers within a specified range. |
| Repeat | Return a sequence having duplicates elements of a specified value. |
| Reverse | Inverts the order of elements of a sequence. |
| Select | Transforms each element of a sequence into a new form. |
| SelectMany | It projects each elements of a sequence to an IEnumerable<T> collection and flattens the resulting sequence into s single sequence. |
| SequenceEqual | Compares two sequences based on the equality comparer and returns a Boolean result. |
| Single | Returns a single element from the sequence that satisfies the specified condition. It throws an exception if there are multiple elements satisfying the condition. |
| SingleOrDefault | Returns a single element from the sequence that satisfies the specified condition or default value if no element satisfies it. It throws an exception if there are multiple elements satisfying the condition. |
| Skip | Ignores the specified number of elements and returns rest of the elements. |
| SkipWhile | Ignores the elements until the specified condition is true and returns rest of the elements. |
| Sum | Computes the sum of the elements of a sequence. |
| Take | Returns the specified number of elements from the starting index of a sequence. |
| TakeWhile | Returns the elements from a sequence until the specified condition is true. |
| ThenBy | Sorts the elements of a sequence in ascending order. It extends the functionality of IOrderedEnumerable<TElement> sequence returned by OrderBy method. |
| ThenByDescending | Sorts the elements of a sequence in descending order. It extends the functionality of IOrderedEnumerable<TElement> sequence returned by OrderBy or OrderByDescending method. |
| ToArray | Converts an IEnumerable<T> to an array. |
| ToDictionary | Converts an IEnumerable<T> to Dictionary<TKey, TValue> according to specified key. |
| ToList | Converts an IEnumerable<T> to List<T> according to specified key. |
| ToLookup | Converts an IEnumerable<T> to Lookup<TKey, TElement> according to specified key. |
| Union | Merges the set of elements of two similar types of sequences. |
| Where | Filters the elements of a sequence based on the specified predicate. |
| Zip | Merges the elements of two sequences based on the specified predicate. |
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