Enumerable.LongCount<TSource> Method (IEnumerable<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)
Parameters
- source
-
Type:
System.Collections.Generic.IEnumerable<TSource>
An IEnumerable<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<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<TSource>.
The following code example demonstrates how to use LongCount<TSource>(IEnumerable<TSource>) to count the elements in an array.
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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