CondensedCollectionExtensionsFirstOrDefaultTSource Method

[This is preliminary documentation and is subject to change.]

Returns the first element of the sequence that satisfies a condition or a default value if no such element is found. Optimized for a CondensedCollection.

Namespace: Condensed.Linq
Assembly: Condensed (in Condensed.dll) Version: 0.1.0.0 (0.1.0.0)

Syntax

C++

Copy

public static TSource FirstOrDefault<TSource>(
	this CondensedCollection<TSource> source,
	Func<TSource, bool> predicate
)

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

public:
[ExtensionAttribute]
generic<typename TSource>
static TSource FirstOrDefault(
	CondensedCollection<TSource>^ source, 
	Func<TSource, bool>^ predicate
)

[<ExtensionAttribute>]
static member FirstOrDefault : 
        source : CondensedCollection<'TSource> * 
        predicate : Func<'TSource, bool> -> 'TSource

Parameters

source: Type: CondensedCondensedCollectionTSource
The collection to return an element from.
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
default(T) if source is empty or if no element passes the test specified by predicate; otherwise, the first element in source that passes the test specified by predicate.

Usage Note

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

Remarks

This implementation of FirstOrDefault() is specialized for a CondensedCollection and tries to take advantage of the CondensedCollection's knowledge of unique values in order to improve performance. If you would rather use the normal LINQ extension method then cast the CondensedCollection to an IListT to use the FirstOrDefaultTSource(IEnumerableTSource, FuncTSource, Boolean) implementation.

Reference

CondensedCollectionExtensions Class