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Enumerable.GroupBy Method

.NET Framework 4

Groups the elements of a sequence.

This member is overloaded. For complete information about this member, including syntax, usage, and examples, click a name in the overload list.

  Name Description
Public method Static member GroupBy<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>) Groups the elements of a sequence according to a specified key selector function.
Public method Static member 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.
Public method Static member 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.
Public method Static member 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.
Public method Static member 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.
Public method Static member 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.
Public method Static member 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.
Public method Static member 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.
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This is just intellisense !
This is just intellisense !
If I were looking for method signatures, I would stay in VS. The fact that I am coming out to msdn, implies that I am looking for something over and beyond intellisense.

Please consider putting some examples.

Edit by SJ at MSFT: This page is just a list of the overloads. Some of the list entries have examples:
http://msdn.microsoft.com/en-us/library/bb534304.aspx
http://msdn.microsoft.com/en-us/library/bb549393.aspx
http://msdn.microsoft.com/en-us/library/bb534493.aspx
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Good examples
http://www.codeproject.com/articles/35667/How-to-Use-LINQ-GroupBy.aspx
http://www.hookedonlinq.com/GroupByOperator.ashx
http://www.devcurry.com/2009/02/groupby-multiple-values-in-linq.html
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