StreamReader question

tibby812

Member
Joined
May 12, 2005
Messages
11
Programming Experience
Beginner
Good Evening,

I have just signed up in hopes of finding a good explanation to my question. I would like to thank everyone in advance for any help they could give.

Problem:

I am trying to create a "Previous Record" button for a windows form.

Current Setup:

i have a File menu with 2 menu items ( OPEN , EXIT )
i have 2 labels for display purposes ( nameLabel , phoneLabel )
and i have 2 buttons ( NEXT , PREV )

i am using the StreamReader to open up and read from a txt file.

Here is the code that i have on the form.

VB.NET:
Option Strict On

Imports System.IO

Public Class Form1
	Inherits System.Windows.Forms.Form

Private phoneStreamReader As StreamReader

	Private Sub fileOpenMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles fileOpenMenuItem.Click
		'Open the file
		Dim response As DialogResult
		OpenFileDialog1.InitialDirectory = Application.StartupPath
		response = OpenFileDialog1.ShowDialog()
		If response <> DialogResult.Cancel Then
		    phoneStreamReader = New StreamReader(OpenFileDialog1.FileName)
			nextButton_Click(sender, e)
		End If

	End Sub

	Private Sub nextButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles nextButton.Click
		Dim test As Long
		If phoneStreamReader.Peek <> -1 Then
			nameLabel.Text = phoneStreamReader.ReadLine()
			phoneLabel.Text = phoneStreamReader.ReadLine()
		End If
	End Sub

	Private Sub prevButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles prevButton.Click
		
	End Sub
End Class

As the code shows, i am asking the user to specify the TXT file, then the file is open and read. The first 2 lines are then assigned to the Labels.Text

My problem is i would like to setup a previous button to go "backwards" in the txt file.

Is this possible?

Thank You

Tibby
 
since the streamreader only reads in one direction (beggining to end)
you could have the streamreader read the entire txt file into a list collection that way to go "back" just get the info from the collection

collections have an index that you can use to move foreward (index + 1) or backwards (index - 1)
 

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