MongoQueryable.GroupBy(TSource, TKey) Method (IMongoQueryable(TSource), Expression(Func(TSource, TKey))) (original) (raw)
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: 2.10.0+569905ff5e778c38ea19d9d0392496a83e1704ed
Syntax
public static IMongoQueryable<IGrouping<TKey, TSource>> GroupBy<TSource, TKey>( this IMongoQueryable source, Expression<Func<TSource, TKey>> keySelector )
Public Shared Function GroupBy(Of TSource, TKey) ( source As IMongoQueryable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey)) ) As IMongoQueryable(Of IGrouping(Of TKey, TSource))[] static member GroupBy : source : IMongoQueryable<'TSource> * keySelector : Expression<Func<'TSource, 'TKey>> -> IMongoQueryable<IGrouping<'TKey, 'TSource>>
Parameters
source
Type: MongoDB.Driver.LinqIMongoQueryableTSource
An IMongoQueryableT whose elements to group.
keySelector
Type: System.Linq.ExpressionsExpressionFuncTSource, TKey
A function to extract the key for each element.
Type Parameters
TSource
The type of the elements of source.
TKey
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