DryadLinqQueryable.FirstAsQuery(TSource) Method (IQueryable(TSource), Expression(Func(TSource, Boolean)))

DryadLinqQueryableFirstAsQueryTSource Method (IQueryableTSource, ExpressionFuncTSource, Boolean)

DryadLINQ documentation

Same as FirstTSource(IQueryableTSource, ExpressionFuncTSource, Boolean), but returns an IQueryable<TSource> containing a single element.

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 IQueryable<TSource> FirstAsQuery<TSource>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, bool>> predicate
)

<ExtensionAttribute> 
Public Shared Function FirstAsQuery(Of TSource) ( 
	source As IQueryable(Of TSource),
	predicate As Expression(Of Func(Of TSource, Boolean))
) As IQueryable(Of TSource)

public:
[ExtensionAttribute]
generic<typename TSource>
static IQueryable<TSource>^ FirstAsQuery(
	IQueryable<TSource>^ source, 
	Expression<Func<TSource, bool>^>^ predicate
)

Parameters

source: Type: System.LinqIQueryableTSource
The input sequence
predicate: Type: System.Linq.ExpressionsExpressionFuncTSource, Boolean
A predicate to test each element for a condition

Type Parameters

TSource: The type of the elements of source

Return Value

Type: IQueryableTSource
The first element in the input sequence that satisfies the predicate

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).

Exceptions

Exception	Condition
DryadLinqException	No element in the input sequence satisfies the predicate

Reference

DryadLinqQueryable Class

FirstAsQuery Overload

Microsoft.Research.DryadLinq Namespace