BcfReadOnlyArrayListExtensionsSingleOrDefaultTSource Method (BcfReadOnlyArrayListTSource, FuncTSource, Boolean)

Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.

Namespace: System.Linq
Assembly: CalculationWorks.BusinessModel (in CalculationWorks.BusinessModel.dll) Version: 4.2.0

Syntax

Copy

public static TSource SingleOrDefault<TSource>(
	this BcfReadOnlyArrayList<TSource> source,
	Func<TSource, bool> predicate
)

<ExtensionAttribute>
Public Shared Function SingleOrDefault(Of TSource) ( 
	source As BcfReadOnlyArrayList(Of TSource),
	predicate As Func(Of TSource, Boolean)
) As TSource

Parameters

source: Type: CalculationWorks.BusinessModelBcfReadOnlyArrayListTSource
The source.
predicate: Type: SystemFuncTSource, Boolean
A function to test each element for a condition.

Type Parameters

TSource: The type of the elements of source.

Return Value

Type: TSource
The only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.

Usage Note

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

BcfReadOnlyArrayListExtensions Class

SingleOrDefault Overload

System.Linq Namespace