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Enumerable::GroupBy Method

.NET Framework (current version)
 

Groups the elements of a sequence.

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

NameDescription
System_CAPS_pubmethodSystem_CAPS_staticGroupBy<TSource, TKey>(IEnumerable<TSource>^, Func<TSource, TKey>^)

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

System_CAPS_pubmethodSystem_CAPS_staticGroupBy<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.

System_CAPS_pubmethodSystem_CAPS_staticGroupBy<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.

System_CAPS_pubmethodSystem_CAPS_staticGroupBy<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.

System_CAPS_pubmethodSystem_CAPS_staticGroupBy<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.

System_CAPS_pubmethodSystem_CAPS_staticGroupBy<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.

System_CAPS_pubmethodSystem_CAPS_staticGroupBy<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.

System_CAPS_pubmethodSystem_CAPS_staticGroupBy<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.

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