Enumerable.LongCount(Of TSource) Method (IEnumerable(Of TSource))
.NET Framework (current version)
Returns an Int64 that represents the total number of elements in a sequence.
Assembly: System.Core (in System.Core.dll)
<ExtensionAttribute> Public Shared Function LongCount(Of TSource) ( source As IEnumerable(Of TSource) ) As Long
Parameters
- source
-
Type:
System.Collections.Generic.IEnumerable(Of TSource)
An IEnumerable(Of T) that contains the elements to be counted.
Type Parameters
- TSource
The type of the elements of source.
| Exception | Condition |
|---|---|
| ArgumentNullException | source is null. |
| OverflowException | The number of elements exceeds MaxValue. |
Use this method rather than Count(Of TSource) when you expect the result to be greater than MaxValue.
In Visual Basic query expression syntax, an Aggregate Into LongCount() clause translates to an invocation of LongCount(Of TSource).
The following code example demonstrates how to use LongCount(Of TSource)(IEnumerable(Of TSource)) to count the elements in an array.
' Create an array of strings. Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"} ' Get the number of items in the array. Dim count As Long = fruits.LongCount() ' Display the result. MsgBox("There are " & count & " fruits in the collection.") ' This code produces the following output: ' ' There are 6 fruits in the collection.
Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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