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Queue.Dequeue Method

Removes and returns the object at the beginning of the Queue.

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)

abstract Dequeue : unit -> Object  
override Dequeue : unit -> Object

Return Value

Type: System.Object
The object that is removed from the beginning of the Queue.

ExceptionCondition
InvalidOperationException

The Queue is empty.

This method is similar to the Peek method, but Peek does not modify the Queue.

a null reference (Nothing in Visual Basic) can be added to the Queue as a value. To distinguish between a null value and the end of the Queue, check the Count property or catch the InvalidOperationException, which is thrown when the Queue is empty.

This method is an O(1) operation.

The following example shows how to add elements to the Queue, remove elements from the Queue, or view the element at the beginning of the Queue.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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