String.CopyTo Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Copies a specified number of characters from a specified position in this instance to a specified position in an array of Unicode characters.

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

Public Sub CopyTo ( _
	sourceIndex As Integer, _
	destination As Char(), _
	destinationIndex As Integer, _
	count As Integer _


Type: System.Int32
The index of the first character in this instance to copy.
Type: System.Char ()
An array of Unicode characters to which characters in this instance are copied.
Type: System.Int32
An index in destination at which the copy operation begins.
Type: System.Int32
The number of characters in this instance to copy to destination.


destination is Nothing.


sourceIndex, destinationIndex, or count is negative


count is greater than the length of the substring from startIndex to the end of this instance


count is greater than the length of the subarray from destinationIndex to the end of destination

count characters are copied from the sourceIndex position of this instance to the destinationIndex position of destination.

sourceIndex and destinationIndex are zero-based.

The following code example demonstrates the CopyTo method.

Public Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      ' Embed an array of characters in a string
      Dim strSource As String = "changed"
      Dim destination As Char() = {"T"c, "h"c, "e"c, " "c, "i"c, "n"c, "i"c, _
                  "t"c, "i"c, "a"c, "l"c, " "c, "a"c, "r"c, "r"c, "a"c, "y"c}

      ' Print the char array
      outputBlock.Text &= destination & vbCrLf

      ' Embed the source string in the destination string
      strSource.CopyTo(0, destination, 4, strSource.Length)

      ' Print the resulting array
      outputBlock.Text &= destination & vbCrLf

      strSource = "A different string"

      ' Embed only a section of the source string in the destination
      strSource.CopyTo(2, destination, 3, 9)

      ' Print the resulting array
      outputBlock.Text &= destination & vbCrLf
   End Sub
End Class
' The example displays the following output:
'       The initial array
'       The changed array
'       Thedifferentarray

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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