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String.ToCharArray Method (Int32, Int32)

Copies the characters in a specified substring in this instance to a Unicode character array.

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

'Declaration
Public Function ToCharArray ( _
	startIndex As Integer, _
	length As Integer _
) As Char()

Parameters

startIndex
Type: System.Int32

The starting position of a substring in this instance.

length
Type: System.Int32

The length of the substring in this instance.

Return Value

Type: System.Char()
A Unicode character array whose elements are the length number of characters in this instance starting from character position startIndex.

ExceptionCondition
ArgumentOutOfRangeException

startIndex or length is less than zero.

-or-

startIndex plus length is greater than the length of this instance.

This method copies the characters in a portion of a string to a character array. To create a string from a range of characters in a character array, call the String(Char(), Int32, Int32) constructor.

The startIndex parameter is zero-based. That is, the index of the first character in the string instance is zero.

If length is zero, the returned array is empty and has a zero length. If this instance is Nothing or an empty string (""), the returned array is empty and has a zero length.

The following example converts a substring within a string to an array of characters, then enumerates and displays the elements of the array.

' Sample for String.ToCharArray(Int32, Int32) 
Imports System

Class Sample

   Public Shared Sub Main()
      Dim str As String = "012wxyz789" 
      Dim arr() As Char

      arr = str.ToCharArray(3, 4)
      Console.Write("The letters in '{0}' are: '", str)
      Console.Write(arr)
      Console.WriteLine("'")
      Console.WriteLine("Each letter in '{0}' is:", str)
      Dim c As Char 
      For Each c In arr
         Console.WriteLine(c)
      Next c
   End Sub 'Main
End Class 'Sample

'This example produces the following results: 
'The letters in '012wxyz789' are: 'wxyz' 
'Each letter in '012wxyz789' is: 
'w 
'x 
'y 
'z 
'

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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