Enumerable Class

Definition

Provides a set of static (Shared in Visual Basic) methods for querying objects that implement IEnumerable<T>.

public static class Enumerable
Inheritance
Enumerable

Inherited Members

System.Object

Remarks

The methods in this class provide an implementation of the standard query operators for querying data sources that implement IEnumerable<T>. The standard query operators are general purpose methods that follow the LINQ pattern and enable you to express traversal, filter, and projection operations over data in any .NET-based programming language.

The majority of the methods in this class are defined as extension methods that extend IEnumerable<T>. This means they can be called like an instance method on any object that implements IEnumerable<T>.

Methods that are used in a query that returns a sequence of values do not consume the target data until the query object is enumerated. This is known as deferred execution. Methods that are used in a query that returns a singleton value execute and consume the target data immediately.

Methods

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.

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>(​IEnumerable<​TSource>, ​Func<​TSource,​TSource,​TSource>)

Applies an accumulator function over a sequence.

All<​TSource>(​IEnumerable<​TSource>, ​Func<​TSource,​Boolean>)

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.

Append<​TSource>(​IEnumerable<​TSource>, ​TSource)
As​Enumerable<​TSource>(​IEnumerable<​TSource>)

Returns the input typed as IEnumerable<T>.

Average(​IEnumerable<​Single>)

Computes the average of a sequence of Single values.

Average(​IEnumerable<​Nullable<​Single>>)

Computes the average of a sequence of nullable Single values.

Average(​IEnumerable<​Nullable<​Int64>>)

Computes the average of a sequence of nullable Int64 values.

Average(​IEnumerable<​Nullable<​Int32>>)

Computes the average of a sequence of nullable Int32 values.

Average(​IEnumerable<​Nullable<​Double>>)

Computes the average of a sequence of nullable Double values.

Average(​IEnumerable<​Int64>)

Computes the average of a sequence of Int64 values.

Average(​IEnumerable<​Int32>)

Computes the average of a sequence of Int32 values.

Average(​IEnumerable<​Double>)

Computes the average of a sequence of Double values.

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<​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,​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.

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,​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<​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<​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,​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,​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,​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,​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.

Cast<​TResult>(​IEnumerable)

Casts the elements of an IEnumerable to the specified type.

Concat<​TSource>(​IEnumerable<​TSource>, ​IEnumerable<​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, ​IEquality​Comparer<​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.

Default​If​Empty<​TSource>(​IEnumerable<​TSource>, ​TSource)

Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.

Default​If​Empty<​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.

Distinct<​TSource>(​IEnumerable<​TSource>)

Returns distinct elements from a sequence by using the default equality comparer to compare values.

Distinct<​TSource>(​IEnumerable<​TSource>, ​IEquality​Comparer<​TSource>)

Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values.

Element​At<​TSource>(​IEnumerable<​TSource>, ​Int32)

Returns the element at a specified index in a sequence.

Element​At​Or​Default<​TSource>(​IEnumerable<​TSource>, ​Int32)

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>, ​IEquality​Comparer<​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.

First​Or​Default<​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.

First​Or​Default<​TSource>(​IEnumerable<​TSource>)

Returns the first element of a sequence, or a default value if the sequence contains no elements.

Group​By<​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.

Group​By<​TSource,​TKey,​TElement,​TResult>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​Func<​TSource,​TElement>, ​Func<​TKey,​IEnumerable<​TElement>,​TResult>, ​IEquality​Comparer<​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.

Group​By<​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.

Group​By<​TSource,​TKey,​TElement>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​Func<​TSource,​TElement>, ​IEquality​Comparer<​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.

Group​By<​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.

Group​By<​TSource,​TKey,​TResult>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​Func<​TKey,​IEnumerable<​TSource>,​TResult>, ​IEquality​Comparer<​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.

Group​By<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>)

Groups the elements of a sequence according to a specified key selector function.

Group​By<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​IEquality​Comparer<​TKey>)

Groups the elements of a sequence according to a specified key selector function and compares the keys by using a specified comparer.

Group​Join<​TOuter,​TInner,​TKey,​TResult>(​IEnumerable<​TOuter>, ​IEnumerable<​TInner>, ​Func<​TOuter,​TKey>, ​Func<​TInner,​TKey>, ​Func<​TOuter,​IEnumerable<​TInner>,​TResult>, ​IEquality​Comparer<​TKey>)

Correlates the elements of two sequences based on key equality and groups the results. A specified IEqualityComparer<T> is used to compare keys.

Group​Join<​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.

Intersect<​TSource>(​IEnumerable<​TSource>, ​IEnumerable<​TSource>, ​IEquality​Comparer<​TSource>)

Produces the set intersection of two sequences by using the specified IEqualityComparer<T> to compare values.

Intersect<​TSource>(​IEnumerable<​TSource>, ​IEnumerable<​TSource>)

Produces the set intersection of two sequences by using the default equality comparer 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>, ​IEquality​Comparer<​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.

Last​Or​Default<​TSource>(​IEnumerable<​TSource>)

Returns the last element of a sequence, or a default value if the sequence contains no elements.

Last​Or​Default<​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.

Long​Count<​TSource>(​IEnumerable<​TSource>, ​Func<​TSource,​Boolean>)

Returns an Int64 that represents how many elements in a sequence satisfy a condition.

Long​Count<​TSource>(​IEnumerable<​TSource>)

Returns an Int64 that represents the total number of elements in a sequence.

Max(​IEnumerable<​Nullable<​Single>>)

Returns the maximum value in a sequence of nullable Single values.

Max(​IEnumerable<​Int32>)

Returns the maximum value in a sequence of Int32 values.

Max(​IEnumerable<​Nullable<​Int64>>)

Returns the maximum value in a sequence of nullable Int64 values.

Max(​IEnumerable<​Single>)

Returns the maximum value in a sequence of Single values.

Max(​IEnumerable<​Nullable<​Int32>>)

Returns the maximum value in a sequence of nullable Int32 values.

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<​Int64>)

Returns the maximum value in a sequence of Int64 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<​TSource,​TResult>(​IEnumerable<​TSource>, ​Func<​TSource,​TResult>)

Invokes a transform function on each element of a generic sequence and returns the maximum resulting 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>(​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,​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<​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<​Double>>)

Invokes a transform function on each element of a sequence and returns the maximum nullable Double 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,​Int32>)

Invokes a transform function on each element of a sequence and returns the maximum Int32 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,​Decimal>)

Invokes a transform function on each element of a sequence and returns the maximum Decimal value.

Max<​TSource>(​IEnumerable<​TSource>)

Returns the maximum value in a generic sequence.

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.

Min(​IEnumerable<​Nullable<​Int64>>)

Returns the minimum value in a sequence of nullable Int64 values.

Min(​IEnumerable<​Nullable<​Int32>>)

Returns the minimum value in a sequence of nullable Int32 values.

Min(​IEnumerable<​Single>)

Returns the minimum value in a sequence of Single values.

Min(​IEnumerable<​Nullable<​Single>>)

Returns the minimum value in a sequence of nullable Single values.

Min(​IEnumerable<​Nullable<​Double>>)

Returns the minimum value in a sequence of nullable Double values.

Min(​IEnumerable<​Double>)

Returns the minimum value in a sequence of Double values.

Min(​IEnumerable<​Int64>)

Returns the minimum value in a sequence of Int64 values.

Min(​IEnumerable<​Int32>)

Returns the minimum value in a sequence of Int32 values.

Min(​IEnumerable<​Nullable<​Decimal>>)

Returns the minimum value in a sequence of nullable Decimal values.

Min(​IEnumerable<​Decimal>)

Returns the minimum value in a sequence of Decimal values.

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.

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>(​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,​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<​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<​Double>>)

Invokes a transform function on each element of a sequence and returns the minimum nullable Double 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,​Int32>)

Invokes a transform function on each element of a sequence and returns the minimum Int32 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,​Decimal>)

Invokes a transform function on each element of a sequence and returns the minimum Decimal value.

Min<​TSource>(​IEnumerable<​TSource>)

Returns the minimum value in a generic sequence.

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.

Of​Type<​TResult>(​IEnumerable)

Filters the elements of an IEnumerable based on a specified type.

Order​By<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>)

Sorts the elements of a sequence in ascending order according to a key.

Order​By<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​IComparer<​TKey>)

Sorts the elements of a sequence in ascending order by using a specified comparer.

Order​By​Descending<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​IComparer<​TKey>)

Sorts the elements of a sequence in descending order by using a specified comparer.

Order​By​Descending<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>)

Sorts the elements of a sequence in descending order according to a key.

Prepend<​TSource>(​IEnumerable<​TSource>, ​TSource)
Range(​Int32, ​Int32)

Generates a sequence of integral numbers within a specified range.

Repeat<​TResult>(​TResult, ​Int32)

Generates a sequence that contains one repeated value.

Reverse<​TSource>(​IEnumerable<​TSource>)

Inverts the order of the elements in a sequence.

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.

Select<​TSource,​TResult>(​IEnumerable<​TSource>, ​Func<​TSource,​TResult>)

Projects each element of a sequence into a new form.

Select​Many<​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.

Select​Many<​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.

Select​Many<​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.

Select​Many<​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.

Sequence​Equal<​TSource>(​IEnumerable<​TSource>, ​IEnumerable<​TSource>)

Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type.

Sequence​Equal<​TSource>(​IEnumerable<​TSource>, ​IEnumerable<​TSource>, ​IEquality​Comparer<​TSource>)

Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>.

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.

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​Or​Default<​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.

Single​Or​Default<​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>(​IEnumerable<​TSource>, ​Int32)

Bypasses a specified number of elements in a sequence and then returns the remaining elements.

Skip​Last<​TSource>(​IEnumerable<​TSource>, ​Int32)
Skip​While<​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.

Skip​While<​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<​Nullable<​Int32>>)

Computes the sum of a sequence of nullable Int32 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(​IEnumerable<​Nullable<​Int64>>)

Computes the sum of a sequence of nullable Int64 values.

Sum(​IEnumerable<​Nullable<​Double>>)

Computes the sum of a sequence of nullable Double values.

Sum(​IEnumerable<​Double>)

Computes the sum of a sequence of Double values.

Sum(​IEnumerable<​Int64>)

Computes the sum of a sequence of Int64 values.

Sum(​IEnumerable<​Int32>)

Computes the sum of a sequence of Int32 values.

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<​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.

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,​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<​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<​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<​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,​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,​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,​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,​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.

Take<​TSource>(​IEnumerable<​TSource>, ​Int32)

Returns a specified number of contiguous elements from the start of a sequence.

Take​Last<​TSource>(​IEnumerable<​TSource>, ​Int32)
Take​While<​TSource>(​IEnumerable<​TSource>, ​Func<​TSource,​Boolean>)

Returns elements from a sequence as long as a specified condition is true.

Take​While<​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.

Then​By<​TSource,​TKey>(​IOrdered​Enumerable<​TSource>, ​Func<​TSource,​TKey>, ​IComparer<​TKey>)

Performs a subsequent ordering of the elements in a sequence in ascending order by using a specified comparer.

Then​By<​TSource,​TKey>(​IOrdered​Enumerable<​TSource>, ​Func<​TSource,​TKey>)

Performs a subsequent ordering of the elements in a sequence in ascending order according to a key.

Then​By​Descending<​TSource,​TKey>(​IOrdered​Enumerable<​TSource>, ​Func<​TSource,​TKey>)

Performs a subsequent ordering of the elements in a sequence in descending order, according to a key.

Then​By​Descending<​TSource,​TKey>(​IOrdered​Enumerable<​TSource>, ​Func<​TSource,​TKey>, ​IComparer<​TKey>)

Performs a subsequent ordering of the elements in a sequence in descending order by using a specified comparer.

To​Array<​TSource>(​IEnumerable<​TSource>)

Creates an array from a IEnumerable<T>.

To​Dictionary<​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.

To​Dictionary<​TSource,​TKey,​TElement>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​Func<​TSource,​TElement>, ​IEquality​Comparer<​TKey>)

Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function, a comparer, and an element selector function.

To​Dictionary<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>)

Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function.

To​Dictionary<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​IEquality​Comparer<​TKey>)

Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function and key comparer.

To​Hash​Set<​TSource>(​IEnumerable<​TSource>, ​IEquality​Comparer<​TSource>)
To​Hash​Set<​TSource>(​IEnumerable<​TSource>)
To​List<​TSource>(​IEnumerable<​TSource>)

Creates a List<T> from an IEnumerable<T>.

To​Lookup<​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.

To​Lookup<​TSource,​TKey,​TElement>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​Func<​TSource,​TElement>, ​IEquality​Comparer<​TKey>)

Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to a specified key selector function, a comparer and an element selector function.

To​Lookup<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>)

Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to a specified key selector function.

To​Lookup<​TSource,​TKey>(​IEnumerable<​TSource>, ​Func<​TSource,​TKey>, ​IEquality​Comparer<​TKey>)

Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to a specified key selector function and key comparer.

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>, ​IEquality​Comparer<​TSource>)

Produces the set union of two sequences by using a specified IEqualityComparer<T>.

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.

Where<​TSource>(​IEnumerable<​TSource>, ​Func<​TSource,​Boolean>)

Filters a sequence of values based on a predicate.

Zip<​TFirst,​TSecond,​TResult>(​IEnumerable<​TFirst>, ​IEnumerable<​TSecond>, ​Func<​TFirst,​TSecond,​TResult>)

Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results.