DryadLinqQueryable.Aggregate(TSource, TAccumulate, TResult) Method (IQueryable(TSource), Expression(Func(TAccumulate)), Expression(Func(TAccumulate, TSource, TAccumulate)), Expression(Func(TAccumulate, TResult)))

DryadLinqQueryableAggregateTSource, TAccumulate, TResult Method (IQueryableTSource, ExpressionFuncTAccumulate, ExpressionFuncTAccumulate, TSource, TAccumulate, ExpressionFuncTAccumulate, TResult)

DryadLINQ documentation

Applies an aggregator function over a sequence.

Namespace: Microsoft.Research.DryadLinq
Assembly: Microsoft.Research.DryadLinq (in Microsoft.Research.DryadLinq.dll) Version: 0.2.1.0 (0.2.1.0)

Syntax

C++

Copy

public static TResult Aggregate<TSource, TAccumulate, TResult>(
	this IQueryable<TSource> source,
	Expression<Func<TAccumulate>> seedFunc,
	Expression<Func<TAccumulate, TSource, TAccumulate>> func,
	Expression<Func<TAccumulate, TResult>> selector
)

<ExtensionAttribute> 
Public Shared Function Aggregate(Of TSource, TAccumulate, TResult) ( 
	source As IQueryable(Of TSource),
	seedFunc As Expression(Of Func(Of TAccumulate)),
	func As Expression(Of Func(Of TAccumulate, TSource, TAccumulate)),
	selector As Expression(Of Func(Of TAccumulate, TResult))
) As TResult

public:
[ExtensionAttribute]
generic<typename TSource, typename TAccumulate, typename TResult>
static TResult Aggregate(
	IQueryable<TSource>^ source, 
	Expression<Func<TAccumulate>^>^ seedFunc, 
	Expression<Func<TAccumulate, TSource, TAccumulate>^>^ func, 
	Expression<Func<TAccumulate, TResult>^>^ selector
)

Parameters

source: Type: System.LinqIQueryableTSource
The input sequence
seedFunc: Type: System.Linq.ExpressionsExpressionFuncTAccumulate
The function that creates the initial accumulator value
func: Type: System.Linq.ExpressionsExpressionFuncTAccumulate, TSource, TAccumulate
An accumualator function to apply to each element
selector: Type: System.Linq.ExpressionsExpressionFuncTAccumulate, TResult
A function to transform the final accumulator value into the result value

Type Parameters

TSource: The type of the elements of source
TAccumulate: The type of the accumulator value
TResult: The type of final result

Return Value

Type: TResult
The result of applying selector to the accumulator value

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryableTSource. 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).

Reference

DryadLinqQueryable Class

Aggregate Overload

Microsoft.Research.DryadLinq Namespace