List.CopyTo Method (Int32, T, Int32, Int32)
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Sub CopyTo ( _ index As Integer, _ array As T(), _ arrayIndex As Integer, _ count As Integer _ ) 'Usage Dim instance As List(Of T) Dim index As Integer Dim array As T() Dim arrayIndex As Integer Dim count As Integer instance.CopyTo(index, array, arrayIndex, count)
The zero-based index in the source List at which copying begins.
The one-dimensional Array that is the destination of the elements copied from List. The Array must have zero-based indexing.
The zero-based index in array at which copying begins.
The number of elements to copy.
array is a null reference (Nothing in Visual Basic).
index is less than 0.
arrayIndex is less than 0.
count is less than 0.
index is equal to or greater than the Count of the source List.
arrayIndex is equal to or greater than the length of array.
The number of elements from index to the end of the source List is greater than the available space from arrayIndex to the end of the destination array.
This method uses System.Array.Copy to copy the elements.
The elements are copied to the Array in the same order in which the enumerator iterates through the List.
This method is an O(n) operation, where n is count.
The following code example demonstrates all three overloads of the CopyTo method. A List of strings is created and populated with 5 strings. An empty string array of 15 elements is created, and the CopyTo(T) method overload is used to copy all the elements of the list to the array beginning at the first element of the array. The CopyTo(T,Int32) method overload is used to copy all the elements of the list to the array beginning at array index 6 (leaving index 5 empty). Finally, the CopyTo(Int32,T,Int32,Int32) method overload is used to copy 3 elements from the list, beginning with index 2, to the array beginning at array index 12 (leaving index 11 empty). The contents of the array are then displayed.
Imports System Imports System.Collections.Generic Public Class Example Public Shared Sub Main() Dim dinosaurs As New List(Of String) dinosaurs.Add("Tyrannosaurus") dinosaurs.Add("Amargasaurus") dinosaurs.Add("Mamenchisaurus") dinosaurs.Add("Brachiosaurus") dinosaurs.Add("Compsognathus") Console.WriteLine() For Each dinosaur As String In dinosaurs Console.WriteLine(dinosaur) Next ' Declare an array with 15 elements (0 through 14). Dim array(14) As String dinosaurs.CopyTo(array) dinosaurs.CopyTo(array, 6) dinosaurs.CopyTo(2, array, 12, 3) Console.WriteLine(vbLf & "Contents of the array:") For Each dinosaur As String In array Console.WriteLine(dinosaur) Next End Sub End Class ' This code example produces the following output: ' 'Tyrannosaurus 'Amargasaurus 'Mamenchisaurus 'Brachiosaurus 'Compsognathus ' 'Contents of the array: 'Tyrannosaurus 'Amargasaurus 'Mamenchisaurus 'Brachiosaurus 'Compsognathus ' 'Tyrannosaurus 'Amargasaurus 'Mamenchisaurus 'Brachiosaurus 'Compsognathus ' 'Mamenchisaurus 'Brachiosaurus 'Compsognathus
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.