EnumerableExtensionsTryGetCountT(IEnumerableT, Int32) Method

Tries to get the number of elements in the source enumeration without enumerating it.

Definition

Namespace: KGySoft.CoreLibraries
Assembly: KGySoft.CoreLibraries (in KGySoft.CoreLibraries.dll) Version: 9.0.0-preview.1

C#

public static bool TryGetCount<T>(
	this IEnumerable<T> source,
	out int count
)

VB

<ExtensionAttribute>
Public Shared Function TryGetCount(Of T) ( 
	source As IEnumerable(Of T),
	<OutAttribute> ByRef count As Integer
) As Boolean

C++

public:
[ExtensionAttribute]
generic<typename T>
static bool TryGetCount(
	IEnumerable<T>^ source, 
	[OutAttribute] int% count
)

F#

[<ExtensionAttribute>]
static member TryGetCount : 
        source : IEnumerable<'T> * 
        count : int byref -> bool

source IEnumerableT: The source to check.
count Int32: If this method returns , then this parameter contains the number of elements in the source enumeration. This parameter is passed uninitialized.

Boolean
, if the number of elements could be determined without enumeration; otherwise, .

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

This method supports some public interfaces as well as some common LINQ iterators (on .NET Core/.NET platforms).

Note

This method is similar to the Enumerable.TryGetNonEnumeratedCount method in .NET 6 and above but can be used in any targeted platform and considers also IReadOnlyCollectionT implementations.