how to write all values in text file . please look this issue.

Question

2.00/5 (1 vote)

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hi i am writing these text using windows service in vb.net.

It works fine when i write text like i am storing value for a="aaa" and writing in System.IO.File.WriteAllText("C:\test1.txt",a) . now if you open the test1.txt file you can see aaa.

but i need to write these 5 value in test1.txt.

a="abc"
b="bbb"
c="ccc"
d="ddd"
e="eee"

System.IO.File.WriteAllText("C:\test1.txt", a)
System.IO.File.WriteAllText("C:\test1.txt", b)
System.IO.File.WriteAllText("C:\test1.txt", c)
System.IO.File.WriteAllText("C:\test1.txt", d)
System.IO.File.WriteAllText("C:\test1.txt", e)

if i give like above, it ovewrites the all value . so, finally the nodepad(test1.txt) has e value only (ie, eee). so, how to write all these 5 value in test1.txt.

i mean if we open test1.txt file, it shoud have: aaa
bbb
ccc
ddd
eee

Please help.

Posted 16-Oct-13 5:31am

christhuxavier

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3 solutions

Solution 1

File.WriteAllText creates a new file by deleting any existing file, and writes a bunch of text to it. So, each time you call it, you scrap the data you wrote last time!

There are a lot of different ways to do this, but since it seems like you want each string on a new line, try this:

VB

Dim lines As String() = New String() {"abc", "bbb", "ccc", "ddd", "eee"}
File.WriteAllLines("C:\text1.txt", lines)

Posted 16-Oct-13 5:37am

OriginalGriff

Comments

Thomas Daniels 16-Oct-13 11:52am

You beat it to me! +5!

OriginalGriff 16-Oct-13 12:02pm

Luckily for both of us, I'm not that way inclined! :laugh:

Solution 3

VB

Dim sb As StringBuilder = New StringBuilder()
        sb.AppendLine("This is the first line")
        sb.AppendLine("This is the second line")
        sb.AppendLine("This is the third line")
        ' Just one call to IO subsystem
        File.AppendAllText("d:\tes1.text", sb.ToString())

it will work i tried it
and also give out put which you required.

please give me reply what happen it work or not...........

Posted 28-Oct-13 3:47am

basurajkumbhar

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Thomas Daniels · Accepted Answer · 2013-10-16T05:40:00

Solution 2

File.WriteAllText doesn't append text to the file: it just overwrites the file. Try to use File.WriteAllLines[^] to add all lines.

VB

System.IO.File.WriteAllLines("C:\test1.txt", New String() {a, b, c, d, e})

Note: if you just want to append some text, then use File.AppendAllText[^] or File.AppendAllLines[^]

Hope this helps.

Posted 16-Oct-13 5:40am

Thomas Daniels

Updated 16-Oct-13 5:41am

v2

Comments

christhuxavier 16-Oct-13 12:16pm

I got it. Thanks a lot!.

Thomas Daniels 16-Oct-13 12:17pm

You're welcome!

Sergey Alexandrovich Kryukov 16-Oct-13 15:52pm

5ed, just for showing the useful alternative.
—SA

Thomas Daniels 18-Oct-13 12:19pm

Thank you!