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: 2.9.0+32b058abcdf2c7e8d9dd3a676d207b31897eee2e
Syntax public static IMongoQueryable<IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(
this IMongoQueryable<TSource> source,
Expression<Func<TSource, TKey>> keySelector
)
<ExtensionAttribute>
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))
[<ExtensionAttribute>]
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