String.CopyTo Method

July 28, 2014

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)

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

Parameters

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

ExceptionCondition
ArgumentNullException

destination is Nothing.

ArgumentOutOfRangeException

sourceIndex, destinationIndex, or count is negative

-or-

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

-or-

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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