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How to: Read Characters from a String

The following code example allows you to read a certain number of characters from an existing string, starting at a specified place in the string. Use StringReader to do this, as demonstrated below.

This code defines a string and converts it to an array of characters, which can then be read by using the appropriate StringReader.Read method.

This example reads only the specified number of characters from the string, as follows.


Imports System
Imports System.IO

Public Class CharsFromStr
    Public Shared Sub Main()
        ' Create a string to read characters from.
        Dim str As String = "Some number of characters"
        ' Make a char array the size of the source string
        Dim b(str.Length) As Char
        ' Create an instance of StringReader and attach it to the string.
        Dim sr As New StringReader(str)
        ' Read 13 characters into the array that holds the string,
        ' starting at the third array member.
        sr.Read(b, 0, 13)
        ' Display the output.
        Console.WriteLine(b)
        ' Read the rest of the string from the current position in the
        ' source string into the array, starting at the 6th array member.
        sr.Read(b, 5, str.Length - 13)
        ' Display the output.
        Console.WriteLine(b)
        ' Close the StringReader.
        sr.Close()
    End Sub
End Class
' The example has the following output:
'
' Some number o
' Some f characters


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