Export (0) Print
Expand All

Queue.CopyTo Method

Copies the Queue elements to an existing one-dimensional Array, starting at the specified array index.

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

'Declaration
Public Overridable Sub CopyTo ( _
	array As Array, _
	index As Integer _
)
'Usage
Dim instance As Queue 
Dim array As Array 
Dim index As Integer

instance.CopyTo(array, index)

Parameters

array
Type: System.Array

The one-dimensional Array that is the destination of the elements copied from Queue. The Array must have zero-based indexing.

index
Type: System.Int32

The zero-based index in array at which copying begins.

Implements

ICollection.CopyTo(Array, Int32)

ExceptionCondition
ArgumentNullException

array is Nothing.

ArgumentOutOfRangeException

index is less than zero.

ArgumentException

array is multidimensional.

-or-

The number of elements in the source Queue is greater than the available space from index to the end of the destination array.

ArrayTypeMismatchException

The type of the source Queue cannot be cast automatically to the type of the destination array.

The elements are copied to the Array in the same order in which the enumerator iterates through the Queue.

This method is an O(n) operation, where n is Count.

The following example shows how to copy a Queue into a one-dimensional array.

Imports System
Imports System.Collections
Imports Microsoft.VisualBasic

Public Class SamplesQueue    

    Public Shared Sub Main()

        ' Creates and initializes the source Queue. 
        Dim mySourceQ As New Queue()
        mySourceQ.Enqueue("three")
        mySourceQ.Enqueue("napping")
        mySourceQ.Enqueue("cats")
        mySourceQ.Enqueue("in")
        mySourceQ.Enqueue("the")
        mySourceQ.Enqueue("barn")

        ' Creates and initializes the one-dimensional target Array. 
        Dim myTargetArray As Array = Array.CreateInstance(GetType(String), 15)
        myTargetArray.SetValue("The", 0)
        myTargetArray.SetValue("quick", 1)
        myTargetArray.SetValue("brown", 2)
        myTargetArray.SetValue("fox", 3)
        myTargetArray.SetValue("jumped", 4)
        myTargetArray.SetValue("over", 5)
        myTargetArray.SetValue("the", 6)
        myTargetArray.SetValue("lazy", 7)
        myTargetArray.SetValue("dog", 8)

        ' Displays the values of the target Array.
        Console.WriteLine("The target Array contains the " & _
           "following (before and after copying):")
        PrintValues(myTargetArray, " "c)

        ' Copies the entire source Queue to the target Array, starting 
        ' at index 6.
        mySourceQ.CopyTo(myTargetArray, 6)

        ' Displays the values of the target Array.
        PrintValues(myTargetArray, " "c)

        ' Copies the entire source Queue to a new standard array. 
        Dim myStandardArray As Object() = mySourceQ.ToArray()

        ' Displays the values of the new standard array.
        Console.WriteLine("The new standard array contains the following:")
        PrintValues(myStandardArray, " "c)

    End Sub 

    Public Shared Sub PrintValues(myArr As Array, mySeparator As Char)
        Dim myObj As [Object]
        For Each myObj In  myArr
            Console.Write("{0}{1}", mySeparator, myObj)
        Next myObj
        Console.WriteLine()
    End Sub 'PrintValues

End Class 'SamplesQueue


' This code produces the following output. 
'  
' The target Array contains the following (before and after copying): 
'  The quick brown fox jumped over the lazy dog 
'  The quick brown fox jumped over three napping cats in the barn 
' The new standard array contains the following: 
'  three napping cats in the barn

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Community Additions

ADD
Show:
© 2015 Microsoft