Enumerable Class
Provides a set of static (Shared in Visual Basic) methods for querying objects that implement IEnumerable<'T>.
Assembly: System.Core (in System.Core.dll)
| 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>(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. |
![]() ![]() | AsEnumerable<'TSource>(IEnumerable<'TSource>) | Returns the input typed as IEnumerable<'T>. |
![]() ![]() | Average(IEnumerable<Decimal>) | Computes the average of a sequence of Decimal values. |
![]() ![]() | Average(IEnumerable<Double>) | Computes the average of a sequence of Double values. |
![]() ![]() | Average(IEnumerable<Int32>) | Computes the average of a sequence of Int32 values. |
![]() ![]() | Average(IEnumerable<Int64>) | Computes the average of a sequence of Int64 values. |
![]() ![]() | Average(IEnumerable<Nullable<Decimal>>) | Computes the average of a sequence of nullable Decimal values. |
![]() ![]() | Average(IEnumerable<Nullable<Double>>) | Computes the average of a sequence of nullable Double values. |
![]() ![]() | Average(IEnumerable<Nullable<Int32>>) | Computes the average of a sequence of nullable Int32 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>(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, 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>(IEnumerable<'TSource>, Int32) | Returns the element at a specified index in a sequence. |
![]() ![]() | ElementAtOrDefault<'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>, 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, '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>) | 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, '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<Double>) | Returns the maximum value in a sequence of Double values. |
![]() ![]() | Max(IEnumerable<Int32>) | Returns the maximum value in a sequence of Int32 values. |
![]() ![]() | Max(IEnumerable<Int64>) | Returns the maximum value in a sequence of Int64 values. |
![]() ![]() | Max(IEnumerable<Nullable<Decimal>>) | Returns the maximum value in a sequence of nullable Decimal values. |
![]() ![]() | Max(IEnumerable<Nullable<Double>>) | Returns the maximum value in a sequence of nullable Double values. |
![]() ![]() | Max(IEnumerable<Nullable<Int32>>) | Returns the maximum value in a sequence of nullable Int32 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<Double>) | Returns the minimum value in a sequence of Double values. |
![]() ![]() | Min(IEnumerable<Int32>) | Returns the minimum value in a sequence of Int32 values. |
![]() ![]() | Min(IEnumerable<Int64>) | Returns the minimum value in a sequence of Int64 values. |
![]() ![]() | Min(IEnumerable<Nullable<Decimal>>) | Returns the minimum value in a sequence of nullable Decimal values. |
![]() ![]() | Min(IEnumerable<Nullable<Double>>) | Returns the minimum value in a sequence of nullable Double values. |
![]() ![]() | Min(IEnumerable<Nullable<Int32>>) | Returns the minimum value in a sequence of nullable Int32 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>(IEnumerable) | 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(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, '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>(IEnumerable<'TSource>, Int32) | 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<Double>) | Computes the sum of a sequence of Double values. |
![]() ![]() | Sum(IEnumerable<Int32>) | Computes the sum of a sequence of Int32 values. |
![]() ![]() | Sum(IEnumerable<Int64>) | Computes the sum of a sequence of Int64 values. |
![]() ![]() | Sum(IEnumerable<Nullable<Decimal>>) | Computes the sum of a sequence of nullable Decimal values. |
![]() ![]() | Sum(IEnumerable<Nullable<Double>>) | Computes the sum of a sequence of nullable Double values. |
![]() ![]() | Sum(IEnumerable<Nullable<Int32>>) | Computes the sum of a sequence of nullable Int32 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>(IEnumerable<'TSource>, Int32) | 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>(IEnumerable<'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>(IEnumerable<'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>(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. |
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.
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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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