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MongoQueryableGroupByTSource, TKey Method (IMongoQueryableTSource, ExpressionFuncTSource, TKey)
Groups the elements of a sequence according to a specified key selector function.

Namespace: MongoDB.Driver.Linq
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.2.0
public static IMongoQueryable<IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(
	this IMongoQueryable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector


Type: MongoDB.Driver.LinqIMongoQueryableTSource
An IMongoQueryableT whose elements to group.
Type: System.Linq.ExpressionsExpressionFuncTSource, TKey
A function to extract the key for each element.

Type Parameters

The type of the elements of source.
The type of the key returned by the function represented in keySelector.

Return Value

Type: IMongoQueryableIGroupingTKey, TSource
An IMongoQueryableT that has a type argument of IGroupingTKey, TElement and where each IGroupingTKey, TElement object contains a sequence of objects and a key.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IMongoQueryableTSource. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
See Also