Enumerable::First<TSource> Method (IEnumerable<TSource>^)
.NET Framework (current version)
Returns the first element of a sequence.
Assembly: System.Core (in System.Core.dll)
public: generic<typename TSource> [ExtensionAttribute] static TSource First( IEnumerable<TSource>^ source )
Parameters
- source
-
Type:
System.Collections.Generic::IEnumerable<TSource>^
The IEnumerable<T> to return the first element of.
Return Value
Type: TSourceThe first element in the specified sequence.
Type Parameters
- TSource
The type of the elements of source.
| Exception | Condition |
|---|---|
| ArgumentNullException | source is null. |
| InvalidOperationException | The source sequence is empty. |
The First<TSource>(IEnumerable<TSource>^) method throws an exception if source contains no elements. To instead return a default value when the source sequence is empty, use the FirstOrDefault<TSource> method.
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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