By: Issac in VB.net Tutorials on 2009-01-31
StreamReader and StreamWriter are actually derived from Textreader and TextWriter, they are another way to read and write to a file but they are not stream classes.
Imports System.IO Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Try Dim line As String Dim readFile As System.IO.TextReader = New _ StreamReader("C:\TextReader.txt") While True line = readFile.ReadLine() If line Is Nothing Then Exit While Else MsgBox(line) End If End While readFile.Close() readFile = Nothing Catch ex As IOException MsgBox(ex.ToString) End Try End Sub End Class
When you execute this program the TextReader read the file line by line.
The following code reads the entire content in a file into string using TextReader.
imports System.IO Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Try Dim line As String Dim readFile As System.IO.TextReader = New _ StreamReader("C:\Test1.txt") line = readFile.ReadToEnd() MsgBox(line) readFile.Close() readFile = Nothing Catch ex As IOException MsgBox(ex.ToString) End Try End Sub End Class
When you execute this code, TextReader reads the entire file in one stretch.
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