# Enumerable Methods

.NET Framework 4.5

The Enumerable type exposes the following members.

## Methods

Name Description
Aggregate<TSource>(IEnumerable<TSource>, Func<TSource, TSource, TSource>) Applies an accumulator function over a sequence.
Aggregate<TSource, TAccumulate>(IEnumerable<TSource>, TAccumulate, Func<TAccumulate, TSource, TAccumulate>) Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value.
Aggregate<TSource, TAccumulate, TResult>(IEnumerable<TSource>, TAccumulate, Func<TAccumulate, TSource, TAccumulate>, Func<TAccumulate, TResult>) Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.
All<TSource> Determines whether all elements of a sequence satisfy a condition.
Any<TSource>(IEnumerable<TSource>) Determines whether a sequence contains any elements.
Any<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Determines whether any element of a sequence satisfies a condition.
AsEnumerable<TSource> Returns the input typed as IEnumerable<T>.
Average(IEnumerable<Decimal>) Computes the average of a sequence of Decimal values.
Average(IEnumerable<Nullable<Decimal>>) Computes the average of a sequence of nullable Decimal values.
Average(IEnumerable<Double>) Computes the average of a sequence of Double values.
Average(IEnumerable<Nullable<Double>>) Computes the average of a sequence of nullable Double values.
Average(IEnumerable<Int32>) Computes the average of a sequence of Int32 values.
Average(IEnumerable<Nullable<Int32>>) Computes the average of a sequence of nullable Int32 values.
Average(IEnumerable<Int64>) Computes the average of a sequence of Int64 values.
Average(IEnumerable<Nullable<Int64>>) Computes the average of a sequence of nullable Int64 values.
Average(IEnumerable<Nullable<Single>>) Computes the average of a sequence of nullable Single values.
Average(IEnumerable<Single>) Computes the average of a sequence of Single values.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Decimal>) Computes the average of a sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Double>) Computes the average of a sequence of Double values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Int32>) Computes the average of a sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Int64>) Computes the average of a sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Decimal>>) Computes the average of a sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Double>>) Computes the average of a sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int32>>) Computes the average of a sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int64>>) Computes the average of a sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Single>>) Computes the average of a sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource, Single>) Computes the average of a sequence of Single values that are obtained by invoking a transform function on each element of the input sequence.
Cast<TResult> Casts the elements of an IEnumerable to the specified type.
Concat<TSource> Concatenates two sequences.
Contains<TSource>(IEnumerable<TSource>, TSource) Determines whether a sequence contains a specified element by using the default equality comparer.
Contains<TSource>(IEnumerable<TSource>, TSource, IEqualityComparer<TSource>) Determines whether a sequence contains a specified element by using a specified IEqualityComparer<T>.
Count<TSource>(IEnumerable<TSource>) Returns the number of elements in a sequence.
Count<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Returns a number that represents how many elements in the specified sequence satisfy a condition.
DefaultIfEmpty<TSource>(IEnumerable<TSource>) Returns the elements of the specified sequence or the type parameter's default value in a singleton collection if the sequence is empty.
DefaultIfEmpty<TSource>(IEnumerable<TSource>, TSource) Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.
Distinct<TSource>(IEnumerable<TSource>) Returns distinct elements from a sequence by using the default equality comparer to compare values.
Distinct<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>) Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values.
ElementAt<TSource> Returns the element at a specified index in a sequence.
ElementAtOrDefault<TSource> Returns the element at a specified index in a sequence or a default value if the index is out of range.
Empty<TResult> Returns an empty IEnumerable<T> that has the specified type argument.
Except<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) Produces the set difference of two sequences by using the default equality comparer to compare values.
Except<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) Produces the set difference of two sequences by using the specified IEqualityComparer<T> to compare values.
First<TSource>(IEnumerable<TSource>) Returns the first element of a sequence.
First<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Returns the first element in a sequence that satisfies a specified condition.
FirstOrDefault<TSource>(IEnumerable<TSource>) Returns the first element of a sequence, or a default value if the sequence contains no elements.
FirstOrDefault<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Returns the first element of the sequence that satisfies a condition or a default value if no such element is found.
GroupBy<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>) Groups the elements of a sequence according to a specified key selector function.
GroupBy<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>) Groups the elements of a sequence according to a specified key selector function and compares the keys by using a specified comparer.
GroupBy<TSource, TKey, TElement>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>) Groups the elements of a sequence according to a specified key selector function and projects the elements for each group by using a specified function.
GroupBy<TSource, TKey, TResult>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TKey, IEnumerable<TSource>, TResult>) Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key.
GroupBy<TSource, TKey, TElement>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>, IEqualityComparer<TKey>) Groups the elements of a sequence according to a key selector function. The keys are compared by using a comparer and each group's elements are projected by using a specified function.
GroupBy<TSource, TKey, TResult>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TKey, IEnumerable<TSource>, TResult>, IEqualityComparer<TKey>) Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The keys are compared by using a specified comparer.
GroupBy<TSource, TKey, TElement, TResult>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>, Func<TKey, IEnumerable<TElement>, TResult>) Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The elements of each group are projected by using a specified function.
GroupBy<TSource, TKey, TElement, TResult>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>, Func<TKey, IEnumerable<TElement>, TResult>, IEqualityComparer<TKey>) Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. Key values are compared by using a specified comparer, and the elements of each group are projected by using a specified function.
GroupJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, IEnumerable<TInner>, TResult>) Correlates the elements of two sequences based on equality of keys and groups the results. The default equality comparer is used to compare keys.
GroupJoin<TOuter, TInner, TKey, TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, IEnumerable<TInner>, TResult>, IEqualityComparer<TKey>) Correlates the elements of two sequences based on key equality and groups the results. A specified IEqualityComparer<T> is used to compare keys.
Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) Produces the set intersection of two sequences by using the default equality comparer to compare values.
Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) Produces the set intersection of two sequences by using the specified IEqualityComparer<T> to compare values.
Join<TOuter, TInner, TKey, TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, TInner, TResult>) Correlates the elements of two sequences based on matching keys. The default equality comparer is used to compare keys.
Join<TOuter, TInner, TKey, TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, TInner, TResult>, IEqualityComparer<TKey>) Correlates the elements of two sequences based on matching keys. A specified IEqualityComparer<T> is used to compare keys.
Last<TSource>(IEnumerable<TSource>) Returns the last element of a sequence.
Last<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Returns the last element of a sequence that satisfies a specified condition.
LastOrDefault<TSource>(IEnumerable<TSource>) Returns the last element of a sequence, or a default value if the sequence contains no elements.
LastOrDefault<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Returns the last element of a sequence that satisfies a condition or a default value if no such element is found.
LongCount<TSource>(IEnumerable<TSource>) Returns an Int64 that represents the total number of elements in a sequence.
LongCount<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Returns an Int64 that represents how many elements in a sequence satisfy a condition.
Max(IEnumerable<Decimal>) Returns the maximum value in a sequence of Decimal values.
Max(IEnumerable<Nullable<Decimal>>) Returns the maximum value in a sequence of nullable Decimal values.
Max(IEnumerable<Double>) Returns the maximum value in a sequence of Double values.
Max(IEnumerable<Nullable<Double>>) Returns the maximum value in a sequence of nullable Double values.
Max(IEnumerable<Int32>) Returns the maximum value in a sequence of Int32 values.
Max(IEnumerable<Nullable<Int32>>) Returns the maximum value in a sequence of nullable Int32 values.
Max(IEnumerable<Int64>) Returns the maximum value in a sequence of Int64 values.
Max(IEnumerable<Nullable<Int64>>) Returns the maximum value in a sequence of nullable Int64 values.
Max(IEnumerable<Nullable<Single>>) Returns the maximum value in a sequence of nullable Single values.
Max(IEnumerable<Single>) Returns the maximum value in a sequence of Single values.
Max<TSource>(IEnumerable<TSource>) Returns the maximum value in a generic sequence.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Decimal>) Invokes a transform function on each element of a sequence and returns the maximum Decimal value.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Double>) Invokes a transform function on each element of a sequence and returns the maximum Double value.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Int32>) Invokes a transform function on each element of a sequence and returns the maximum Int32 value.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Int64>) Invokes a transform function on each element of a sequence and returns the maximum Int64 value.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Decimal>>) Invokes a transform function on each element of a sequence and returns the maximum nullable Decimal value.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Double>>) Invokes a transform function on each element of a sequence and returns the maximum nullable Double value.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int32>>) Invokes a transform function on each element of a sequence and returns the maximum nullable Int32 value.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int64>>) Invokes a transform function on each element of a sequence and returns the maximum nullable Int64 value.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Single>>) Invokes a transform function on each element of a sequence and returns the maximum nullable Single value.
Max<TSource>(IEnumerable<TSource>, Func<TSource, Single>) Invokes a transform function on each element of a sequence and returns the maximum Single value.
Max<TSource, TResult>(IEnumerable<TSource>, Func<TSource, TResult>) Invokes a transform function on each element of a generic sequence and returns the maximum resulting value.
Min(IEnumerable<Decimal>) Returns the minimum value in a sequence of Decimal values.
Min(IEnumerable<Nullable<Decimal>>) Returns the minimum value in a sequence of nullable Decimal values.
Min(IEnumerable<Double>) Returns the minimum value in a sequence of Double values.
Min(IEnumerable<Nullable<Double>>) Returns the minimum value in a sequence of nullable Double values.
Min(IEnumerable<Int32>) Returns the minimum value in a sequence of Int32 values.
Min(IEnumerable<Nullable<Int32>>) Returns the minimum value in a sequence of nullable Int32 values.
Min(IEnumerable<Int64>) Returns the minimum value in a sequence of Int64 values.
Min(IEnumerable<Nullable<Int64>>) Returns the minimum value in a sequence of nullable Int64 values.
Min(IEnumerable<Nullable<Single>>) Returns the minimum value in a sequence of nullable Single values.
Min(IEnumerable<Single>) Returns the minimum value in a sequence of Single values.
Min<TSource>(IEnumerable<TSource>) Returns the minimum value in a generic sequence.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Decimal>) Invokes a transform function on each element of a sequence and returns the minimum Decimal value.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Double>) Invokes a transform function on each element of a sequence and returns the minimum Double value.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Int32>) Invokes a transform function on each element of a sequence and returns the minimum Int32 value.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Int64>) Invokes a transform function on each element of a sequence and returns the minimum Int64 value.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Decimal>>) Invokes a transform function on each element of a sequence and returns the minimum nullable Decimal value.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Double>>) Invokes a transform function on each element of a sequence and returns the minimum nullable Double value.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int32>>) Invokes a transform function on each element of a sequence and returns the minimum nullable Int32 value.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int64>>) Invokes a transform function on each element of a sequence and returns the minimum nullable Int64 value.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Single>>) Invokes a transform function on each element of a sequence and returns the minimum nullable Single value.
Min<TSource>(IEnumerable<TSource>, Func<TSource, Single>) Invokes a transform function on each element of a sequence and returns the minimum Single value.
Min<TSource, TResult>(IEnumerable<TSource>, Func<TSource, TResult>) Invokes a transform function on each element of a generic sequence and returns the minimum resulting value.
OfType<TResult> Filters the elements of an IEnumerable based on a specified type.
OrderBy<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>) Sorts the elements of a sequence in ascending order according to a key.
OrderBy<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>, IComparer<TKey>) Sorts the elements of a sequence in ascending order by using a specified comparer.
OrderByDescending<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>) Sorts the elements of a sequence in descending order according to a key.
OrderByDescending<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>, IComparer<TKey>) Sorts the elements of a sequence in descending order by using a specified comparer.
Range Generates a sequence of integral numbers within a specified range.
Repeat<TResult> Generates a sequence that contains one repeated value.
Reverse<TSource> Inverts the order of the elements in a sequence.
Select<TSource, TResult>(IEnumerable<TSource>, Func<TSource, TResult>) Projects each element of a sequence into a new form.
Select<TSource, TResult>(IEnumerable<TSource>, Func<TSource, Int32, TResult>) Projects each element of a sequence into a new form by incorporating the element's index.
SelectMany<TSource, TResult>(IEnumerable<TSource>, Func<TSource, IEnumerable<TResult>>) Projects each element of a sequence to an IEnumerable<T> and flattens the resulting sequences into one sequence.
SelectMany<TSource, TResult>(IEnumerable<TSource>, Func<TSource, Int32, IEnumerable<TResult>>) Projects each element of a sequence to an IEnumerable<T>, and flattens the resulting sequences into one sequence. The index of each source element is used in the projected form of that element.
SelectMany<TSource, TCollection, TResult>(IEnumerable<TSource>, Func<TSource, IEnumerable<TCollection>>, Func<TSource, TCollection, TResult>) Projects each element of a sequence to an IEnumerable<T>, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein.
SelectMany<TSource, TCollection, TResult>(IEnumerable<TSource>, Func<TSource, Int32, IEnumerable<TCollection>>, Func<TSource, TCollection, TResult>) Projects each element of a sequence to an IEnumerable<T>, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. The index of each source element is used in the intermediate projected form of that element.
SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type.
SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>.
Single<TSource>(IEnumerable<TSource>) Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence.
Single<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Returns the only element of a sequence that satisfies a specified condition, and throws an exception if more than one such element exists.
SingleOrDefault<TSource>(IEnumerable<TSource>) Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.
SingleOrDefault<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.
Skip<TSource> Bypasses a specified number of elements in a sequence and then returns the remaining elements.
SkipWhile<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements.
SkipWhile<TSource>(IEnumerable<TSource>, Func<TSource, Int32, Boolean>) Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. The element's index is used in the logic of the predicate function.
Sum(IEnumerable<Decimal>) Computes the sum of a sequence of Decimal values.
Sum(IEnumerable<Nullable<Decimal>>) Computes the sum of a sequence of nullable Decimal values.
Sum(IEnumerable<Double>) Computes the sum of a sequence of Double values.
Sum(IEnumerable<Nullable<Double>>) Computes the sum of a sequence of nullable Double values.
Sum(IEnumerable<Int32>) Computes the sum of a sequence of Int32 values.
Sum(IEnumerable<Nullable<Int32>>) Computes the sum of a sequence of nullable Int32 values.
Sum(IEnumerable<Int64>) Computes the sum of a sequence of Int64 values.
Sum(IEnumerable<Nullable<Int64>>) Computes the sum of a sequence of nullable Int64 values.
Sum(IEnumerable<Nullable<Single>>) Computes the sum of a sequence of nullable Single values.
Sum(IEnumerable<Single>) Computes the sum of a sequence of Single values.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Decimal>) Computes the sum of the sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Double>) Computes the sum of the sequence of Double values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Int32>) Computes the sum of the sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Int64>) Computes the sum of the sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Decimal>>) Computes the sum of the sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Double>>) Computes the sum of the sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int32>>) Computes the sum of the sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int64>>) Computes the sum of the sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Single>>) Computes the sum of the sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource, Single>) Computes the sum of the sequence of Single values that are obtained by invoking a transform function on each element of the input sequence.
Take<TSource> Returns a specified number of contiguous elements from the start of a sequence.
TakeWhile<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Returns elements from a sequence as long as a specified condition is true.
TakeWhile<TSource>(IEnumerable<TSource>, Func<TSource, Int32, Boolean>) Returns elements from a sequence as long as a specified condition is true. The element's index is used in the logic of the predicate function.
ThenBy<TSource, TKey>(IOrderedEnumerable<TSource>, Func<TSource, TKey>) Performs a subsequent ordering of the elements in a sequence in ascending order according to a key.
ThenBy<TSource, TKey>(IOrderedEnumerable<TSource>, Func<TSource, TKey>, IComparer<TKey>) Performs a subsequent ordering of the elements in a sequence in ascending order by using a specified comparer.
ThenByDescending<TSource, TKey>(IOrderedEnumerable<TSource>, Func<TSource, TKey>) Performs a subsequent ordering of the elements in a sequence in descending order, according to a key.
ThenByDescending<TSource, TKey>(IOrderedEnumerable<TSource>, Func<TSource, TKey>, IComparer<TKey>) Performs a subsequent ordering of the elements in a sequence in descending order by using a specified comparer.
ToArray<TSource> Creates an array from a IEnumerable<T>.
ToDictionary<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>) Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to a specified key selector function.
ToDictionary<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>) Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to a specified key selector function and key comparer.
ToDictionary<TSource, TKey, TElement>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>) Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to specified key selector and element selector functions.
ToDictionary<TSource, TKey, TElement>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>, IEqualityComparer<TKey>) Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to a specified key selector function, a comparer, and an element selector function.
ToList<TSource> Creates a List<T> from an IEnumerable<T>.
ToLookup<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>) Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function.
ToLookup<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>) Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function and key comparer.
ToLookup<TSource, TKey, TElement>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>) Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to specified key selector and element selector functions.
ToLookup<TSource, TKey, TElement>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>, IEqualityComparer<TKey>) Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function, a comparer and an element selector function.
Union<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) Produces the set union of two sequences by using the default equality comparer.
Union<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) Produces the set union of two sequences by using a specified IEqualityComparer<T>.
Where<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) Filters a sequence of values based on a predicate.
Where<TSource>(IEnumerable<TSource>, Func<TSource, Int32, Boolean>) Filters a sequence of values based on a predicate. Each element's index is used in the logic of the predicate function.
Zip<TFirst, TSecond, TResult> Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results.
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