Enumerable Class

July 28, 2014

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

System.Object
  System.Linq.Enumerable

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)

public static class Enumerable

The Enumerable type exposes the following members.

  NameDescription
Public methodStatic memberAggregate<TSource>(IEnumerable<TSource>, Func<TSource, TSource, TSource>)Applies an accumulator function over a sequence.
Public methodStatic memberAggregate<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.
Public methodStatic memberAggregate<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.
Public methodStatic memberAll<TSource>Determines whether all elements of a sequence satisfy a condition.
Public methodStatic memberAny<TSource>(IEnumerable<TSource>)Determines whether a sequence contains any elements.
Public methodStatic memberAny<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)Determines whether any element of a sequence satisfies a condition.
Public methodStatic memberAsEnumerable<TSource>Returns the input typed as IEnumerable<T>.
Public methodStatic memberAverage(IEnumerable<Decimal>)Computes the average of a sequence of Decimal values.
Public methodStatic memberAverage(IEnumerable<Nullable<Decimal>>)Computes the average of a sequence of nullable Decimal values.
Public methodStatic memberAverage(IEnumerable<Double>)Computes the average of a sequence of Double values.
Public methodStatic memberAverage(IEnumerable<Nullable<Double>>)Computes the average of a sequence of nullable Double values.
Public methodStatic memberAverage(IEnumerable<Int32>)Computes the average of a sequence of Int32 values.
Public methodStatic memberAverage(IEnumerable<Nullable<Int32>>)Computes the average of a sequence of nullable Int32 values.
Public methodStatic memberAverage(IEnumerable<Int64>)Computes the average of a sequence of Int64 values.
Public methodStatic memberAverage(IEnumerable<Nullable<Int64>>)Computes the average of a sequence of nullable Int64 values.
Public methodStatic memberAverage(IEnumerable<Nullable<Single>>)Computes the average of a sequence of nullable Single values.
Public methodStatic memberAverage(IEnumerable<Single>)Computes the average of a sequence of Single values.
Public methodStatic memberAverage<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.
Public methodStatic memberAverage<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.
Public methodStatic memberAverage<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.
Public methodStatic memberAverage<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.
Public methodStatic memberAverage<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.
Public methodStatic memberAverage<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.
Public methodStatic memberAverage<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.
Public methodStatic memberAverage<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.
Public methodStatic memberAverage<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.
Public methodStatic memberAverage<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.
Public methodStatic memberCast<TResult>Converts the elements of an IEnumerable to the specified type.
Public methodStatic memberConcat<TSource>Concatenates two sequences.
Public methodStatic memberContains<TSource>(IEnumerable<TSource>, TSource)Determines whether a sequence contains a specified element by using the default equality comparer.
Public methodStatic memberContains<TSource>(IEnumerable<TSource>, TSource, IEqualityComparer<TSource>)Determines whether a sequence contains a specified element by using a specified IEqualityComparer<T>.
Public methodStatic memberCount<TSource>(IEnumerable<TSource>)Returns the number of elements in a sequence.
Public methodStatic memberCount<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)Returns a number that represents how many elements in the specified sequence satisfy a condition.
Public methodStatic memberDefaultIfEmpty<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.
Public methodStatic memberDefaultIfEmpty<TSource>(IEnumerable<TSource>, TSource)Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.
Public methodStatic memberDistinct<TSource>(IEnumerable<TSource>)Returns distinct elements from a sequence by using the default equality comparer to compare values.
Public methodStatic memberDistinct<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>)Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values.
Public methodStatic memberElementAt<TSource>Returns the element at a specified index in a sequence.
Public methodStatic memberElementAtOrDefault<TSource>Returns the element at a specified index in a sequence or a default value if the index is out of range.
Public methodStatic memberEmpty<TResult>Returns an empty IEnumerable<T> that has the specified type argument.
Public methodStatic memberExcept<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)Produces the set difference of two sequences by using the default equality comparer to compare values.
Public methodStatic memberExcept<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)Produces the set difference of two sequences by using the specified IEqualityComparer<T> to compare values.
Public methodStatic memberFirst<TSource>(IEnumerable<TSource>)Returns the first element of a sequence.
Public methodStatic memberFirst<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)Returns the first element in a sequence that satisfies a specified condition.
Public methodStatic memberFirstOrDefault<TSource>(IEnumerable<TSource>)Returns the first element of a sequence, or a default value if the sequence contains no elements.
Public methodStatic memberFirstOrDefault<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.
Public methodStatic memberGroupBy<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>)Groups the elements of a sequence according to a specified key selector function.
Public methodStatic memberGroupBy<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.
Public methodStatic memberGroupBy<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.
Public methodStatic memberGroupBy<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.
Public methodStatic memberGroupBy<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.
Public methodStatic memberGroupBy<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.
Public methodStatic memberGroupBy<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.
Public methodStatic memberGroupBy<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.
Public methodStatic memberGroupJoin<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.
Public methodStatic memberGroupJoin<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.
Public methodStatic memberIntersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)Produces the set intersection of two sequences by using the default equality comparer to compare values.
Public methodStatic memberIntersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)Produces the set intersection of two sequences by using the specified IEqualityComparer<T> to compare values.
Public methodStatic memberJoin<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.
Public methodStatic memberJoin<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.
Public methodStatic memberLast<TSource>(IEnumerable<TSource>)Returns the last element of a sequence.
Public methodStatic memberLast<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)Returns the last element of a sequence that satisfies a specified condition.
Public methodStatic memberLastOrDefault<TSource>(IEnumerable<TSource>)Returns the last element of a sequence, or a default value if the sequence contains no elements.
Public methodStatic memberLastOrDefault<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.
Public methodStatic memberLongCount<TSource>(IEnumerable<TSource>)Returns an Int64 that represents the total number of elements in a sequence.
Public methodStatic memberLongCount<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)Returns an Int64 that represents how many elements in a sequence satisfy a condition.
Public methodStatic memberMax(IEnumerable<Decimal>)Returns the maximum value in a sequence of Decimal values.
Public methodStatic memberMax(IEnumerable<Nullable<Decimal>>)Returns the maximum value in a sequence of nullable Decimal values.
Public methodStatic memberMax(IEnumerable<Double>)Returns the maximum value in a sequence of Double values.
Public methodStatic memberMax(IEnumerable<Nullable<Double>>)Returns the maximum value in a sequence of nullable Double values.
Public methodStatic memberMax(IEnumerable<Int32>)Returns the maximum value in a sequence of Int32 values.
Public methodStatic memberMax(IEnumerable<Nullable<Int32>>)Returns the maximum value in a sequence of nullable Int32 values.
Public methodStatic memberMax(IEnumerable<Int64>)Returns the maximum value in a sequence of Int64 values.
Public methodStatic memberMax(IEnumerable<Nullable<Int64>>)Returns the maximum value in a sequence of nullable Int64 values.
Public methodStatic memberMax(IEnumerable<Nullable<Single>>)Returns the maximum value in a sequence of nullable Single values.
Public methodStatic memberMax(IEnumerable<Single>)Returns the maximum value in a sequence of Single values.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>)Returns the maximum value in a generic sequence.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Decimal>)Invokes a transform function on each element of a sequence and returns the maximum Decimal value.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Double>)Invokes a transform function on each element of a sequence and returns the maximum Double value.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Int32>)Invokes a transform function on each element of a sequence and returns the maximum Int32 value.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Int64>)Invokes a transform function on each element of a sequence and returns the maximum Int64 value.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Decimal>>)Invokes a transform function on each element of a sequence and returns the maximum nullable Decimal value.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Double>>)Invokes a transform function on each element of a sequence and returns the maximum nullable Double value.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int32>>)Invokes a transform function on each element of a sequence and returns the maximum nullable Int32 value.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int64>>)Invokes a transform function on each element of a sequence and returns the maximum nullable Int64 value.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Single>>)Invokes a transform function on each element of a sequence and returns the maximum nullable Single value.
Public methodStatic memberMax<TSource>(IEnumerable<TSource>, Func<TSource, Single>)Invokes a transform function on each element of a sequence and returns the maximum Single value.
Public methodStatic memberMax<TSource, TResult>(IEnumerable<TSource>, Func<TSource, TResult>)Invokes a transform function on each element of a generic sequence and returns the maximum resulting value.
Public methodStatic memberMin(IEnumerable<Decimal>)Returns the minimum value in a sequence of Decimal values.
Public methodStatic memberMin(IEnumerable<Nullable<Decimal>>)Returns the minimum value in a sequence of nullable Decimal values.
Public methodStatic memberMin(IEnumerable<Double>)Returns the minimum value in a sequence of Double values.
Public methodStatic memberMin(IEnumerable<Nullable<Double>>)Returns the minimum value in a sequence of nullable Double values.
Public methodStatic memberMin(IEnumerable<Int32>)Returns the minimum value in a sequence of Int32 values.
Public methodStatic memberMin(IEnumerable<Nullable<Int32>>)Returns the minimum value in a sequence of nullable Int32 values.
Public methodStatic memberMin(IEnumerable<Int64>)Returns the minimum value in a sequence of Int64 values.
Public methodStatic memberMin(IEnumerable<Nullable<Int64>>)Returns the minimum value in a sequence of nullable Int64 values.
Public methodStatic memberMin(IEnumerable<Nullable<Single>>)Returns the minimum value in a sequence of nullable Single values.
Public methodStatic memberMin(IEnumerable<Single>)Returns the minimum value in a sequence of Single values.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>)Returns the minimum value in a generic sequence.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Decimal>)Invokes a transform function on each element of a sequence and returns the minimum Decimal value.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Double>)Invokes a transform function on each element of a sequence and returns the minimum Double value.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Int32>)Invokes a transform function on each element of a sequence and returns the minimum Int32 value.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Int64>)Invokes a transform function on each element of a sequence and returns the minimum Int64 value.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Decimal>>)Invokes a transform function on each element of a sequence and returns the minimum nullable Decimal value.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Double>>)Invokes a transform function on each element of a sequence and returns the minimum nullable Double value.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int32>>)Invokes a transform function on each element of a sequence and returns the minimum nullable Int32 value.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int64>>)Invokes a transform function on each element of a sequence and returns the minimum nullable Int64 value.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Single>>)Invokes a transform function on each element of a sequence and returns the minimum nullable Single value.
Public methodStatic memberMin<TSource>(IEnumerable<TSource>, Func<TSource, Single>)Invokes a transform function on each element of a sequence and returns the minimum Single value.
Public methodStatic memberMin<TSource, TResult>(IEnumerable<TSource>, Func<TSource, TResult>)Invokes a transform function on each element of a generic sequence and returns the minimum resulting value.
Public methodStatic memberOfType<TResult>Filters the elements of an IEnumerable based on a specified type.
Public methodStatic memberOrderBy<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>)Sorts the elements of a sequence in ascending order according to a key.
Public methodStatic memberOrderBy<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>, IComparer<TKey>)Sorts the elements of a sequence in ascending order by using a specified comparer.
Public methodStatic memberOrderByDescending<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>)Sorts the elements of a sequence in descending order according to a key.
Public methodStatic memberOrderByDescending<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>, IComparer<TKey>)Sorts the elements of a sequence in descending order by using a specified comparer.
Public methodStatic memberRangeGenerates a sequence of integral numbers within a specified range.
Public methodStatic memberRepeat<TResult>Generates a sequence that contains one repeated value.
Public methodStatic memberReverse<TSource>Inverts the order of the elements in a sequence.
Public methodStatic memberSelect<TSource, TResult>(IEnumerable<TSource>, Func<TSource, TResult>)Projects each element of a sequence into a new form.
Public methodStatic memberSelect<TSource, TResult>(IEnumerable<TSource>, Func<TSource, Int32, TResult>)Projects each element of a sequence into a new form by incorporating the element's index.
Public methodStatic memberSelectMany<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.
Public methodStatic memberSelectMany<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.
Public methodStatic memberSelectMany<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.
Public methodStatic memberSelectMany<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.
Public methodStatic memberSequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type.
Public methodStatic memberSequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>.
Public methodStatic memberSingle<TSource>(IEnumerable<TSource>)Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence.
Public methodStatic memberSingle<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.
Public methodStatic memberSingleOrDefault<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.
Public methodStatic memberSingleOrDefault<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.
Public methodStatic memberSkip<TSource>Bypasses a specified number of elements in a sequence and then returns the remaining elements.
Public methodStatic memberSkipWhile<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.
Public methodStatic memberSkipWhile<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.
Public methodStatic memberSum(IEnumerable<Decimal>)Computes the sum of a sequence of Decimal values.
Public methodStatic memberSum(IEnumerable<Nullable<Decimal>>)Computes the sum of a sequence of nullable Decimal values.
Public methodStatic memberSum(IEnumerable<Double>)Computes the sum of a sequence of Double values.
Public methodStatic memberSum(IEnumerable<Nullable<Double>>)Computes the sum of a sequence of nullable Double values.
Public methodStatic memberSum(IEnumerable<Int32>)Computes the sum of a sequence of Int32 values.
Public methodStatic memberSum(IEnumerable<Nullable<Int32>>)Computes the sum of a sequence of nullable Int32 values.
Public methodStatic memberSum(IEnumerable<Int64>)Computes the sum of a sequence of Int64 values.
Public methodStatic memberSum(IEnumerable<Nullable<Int64>>)Computes the sum of a sequence of nullable Int64 values.
Public methodStatic memberSum(IEnumerable<Nullable<Single>>)Computes the sum of a sequence of nullable Single values.
Public methodStatic memberSum(IEnumerable<Single>)Computes the sum of a sequence of Single values.
Public methodStatic memberSum<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.
Public methodStatic memberSum<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.
Public methodStatic memberSum<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.
Public methodStatic memberSum<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.
Public methodStatic memberSum<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.
Public methodStatic memberSum<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.
Public methodStatic memberSum<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.
Public methodStatic memberSum<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.
Public methodStatic memberSum<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.
Public methodStatic memberSum<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.
Public methodStatic memberTake<TSource>Returns a specified number of contiguous elements from the start of a sequence.
Public methodStatic memberTakeWhile<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)Returns elements from a sequence as long as a specified condition is true.
Public methodStatic memberTakeWhile<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.
Public methodStatic memberThenBy<TSource, TKey>(IOrderedEnumerable<TSource>, Func<TSource, TKey>)Performs a subsequent ordering of the elements in a sequence in ascending order according to a key.
Public methodStatic memberThenBy<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.
Public methodStatic memberThenByDescending<TSource, TKey>(IOrderedEnumerable<TSource>, Func<TSource, TKey>)Performs a subsequent ordering of the elements in a sequence in descending order, according to a key.
Public methodStatic memberThenByDescending<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.
Public methodStatic memberToArray<TSource>Creates an array from a IEnumerable<T>.
Public methodStatic memberToDictionary<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>)Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to a specified key selector function.
Public methodStatic memberToDictionary<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.
Public methodStatic memberToDictionary<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.
Public methodStatic memberToDictionary<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.
Public methodStatic memberToList<TSource>Creates a List<T> from an IEnumerable<T>.
Public methodStatic memberToLookup<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>)Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function.
Public methodStatic memberToLookup<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.
Public methodStatic memberToLookup<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.
Public methodStatic memberToLookup<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.
Public methodStatic memberUnion<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)Produces the set union of two sequences by using the default equality comparer.
Public methodStatic memberUnion<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)Produces the set union of two sequences by using a specified IEqualityComparer<T>.
Public methodStatic memberWhere<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>)Filters a sequence of values based on a predicate.
Public methodStatic memberWhere<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.
Public methodStatic memberZip<TFirst, TSecond, TResult>Merges two sequences by using the specified predicate function.
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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.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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