Streamwriter - Replacing Specific Values In A Large Text File

Jun 4, 2011

I have some large csv files (1.5gb each) where I need to replace specific values. The method I'm currently using is terribly slow and I'm fairly certain that there should be a way to speed this up but I'm just not experienced enough to know what I should be doing. This is my first post and I tried searching through to find something relevant but didn't come across anything.

My other thought would be to break the file into chunks so that I can read the entire thing into memory, do all of the replacements there and then output to a consolidated file. I tried this but the way I did it actually ended up seeming slower than my current method.

Sub Main()
Dim fName As String = "2009.csv"
Dim wrtFile As String = "2009.1.csv"

[Code]....

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[Code]...

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[code]....

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In the following, Response.Write poduces the expected result of displaying user name and password - but nthing is written to the text file (colocated in the root directory).[code]...

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In the following, Response.Write poduces the expected result of displaying user name and password - but nthing is written to the text file (colocated in the root directory).

Imports System
Imports System.IO
Partial Class getCustomer

[code]....

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[Code]...

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[Code]...

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What I basically have is a small game which I want to count wins/loss/ties. I have no problem with the game aspect but need to know how I can replace a string in a csv file. IE: If Jim wins the game, his 5 needs to be turned to a 6. After googling quite a while I came across the replace() function, but it doesn't actually rewrite it back to the text file

Contents of users.txt:
Jim,1.jpg,5,1,0
Will,2.jpg,6,7,0
Tom,3.jpg,5,5,0
Snippet of

[code]....

The issue I have, is if I try to use any sort of IO function after this (WriteAllLines, streamwriter, etc) - I get a process is being used and can't touch the file (because its being read).Must I somehow create a new file with a copy of everything including the replaced string?

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How can I replace like this:
CH_IPVOD_filename.mpg > replace the CH_IPVOD_ with nothing for the result of:
filename.mpg
?

I would like to replace every instance of ch_ipvod_ with nothing.
Public Class Form4
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim fso, inputFile, outputFile
Dim str As String
[Code] .....

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I'm trying to use StreamWriter to write to a text file; it creates the file fine, but when I open it up, it's still empty. I marked the code below where the writing action takes place.

vb Public Sub BHorse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BHorse.Click
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[Code]...

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[Code]....

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[Code]...

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[Code]...

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Imports System
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[code].....

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[code]....

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[code].....

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[Code]...

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