How to replace text string in a text file

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Hello,

I am new to vb.net and am trying to do something really simple. I have this code which reads certain line of text from .ini file.

VB

Dim FilePath As String

FilePath = Application.StartupPath & "\bin\userconfig.ini"
IO.File.WriteAllText(FilePath, IO.File.ReadAllText(FilePath).Replace("UserName = ", TextBox_NewUser.Text)

How do I make it replace that line of text after the "=" with something you type in TextBox_NewUser. As you can see with current code it just replaces the whole "UserName =" which I don't want.

That specific line of text in the .ini by default has this value:
"UserName = Unnamed"

So how do I make it replace just that "Unnamed" with something I type in TextBox_NewUser?

Any assistance will be most appreciated.

What I have tried:

I haven't tried much since I'm a noob in VS.

Posted 21-Mar-16 1:42am

Darius47

Updated 2-May-23 2:01am

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phil.o · Answer 1 · 2016-03-21T01:49:00

Solution 1

It should be obvious that it replaces the "UserName = " part because this is exactly what you are asking it to do.
Why not replacing the "Unnamed" part instead? Something like:

C#

IO.File.WriteAllText(FilePath, IO.File.ReadAllText(FilePath).Replace("Unnamed", TextBox_NewUser.Text)

Posted 21-Mar-16 1:49am

phil.o

Comments

Darius47 21-Mar-16 9:23am

Thank you for your reply, but you see that "Unnamed" is variable and could be anything. So if I'd try to change my name to something else yet again, it wouldn't work.

koolprasad2003 · Answer 2 · 2016-03-21T02:04:00

Solution 2

This is something really easy, see below snippet

VB

'import System.IO
dim text as string = File.ReadAllText("test.txt")
text = text.Replace("some text", "new value")
File.WriteAllText("test.txt", text)

Posted 21-Mar-16 2:04am

koolprasad2003