String.ToCharArray Method (Int32, Int32)

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 null 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) 
using System;

class Sample {
    public static void Main() {
    string str = "012wxyz789";
    char[] arr;

    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);
    foreach (char c in arr)
        Console.WriteLine(c);
    }
}
/*
This example produces the following results:
The letters in '012wxyz789' are: 'wxyz'
Each letter in '012wxyz789' is:
w
x
y
z
*/

.NET Framework

.NET Framework Client Profile

Portable Class Library

.NET for Windows Store apps

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

Reference