C#•2mo ago

text file management

hey, so i'm trying to use the streamwriter function to write in a text file, but it always replace the text it's in it, how do i add lines without deleting the preceding texts?

54 Replies

jcotton42•2mo ago

how are you opening the file?

LostAngel•2mo ago

i'm opening it with the streamwriter function, like that

StreamWriter sw = new StreamWriter($"./datas/Players/{e.Author.Id}/Historique.txt");
                sw.WriteLine($"the main text");
                sw.Flush();
                sw.Close();

StreamWriter sw = new StreamWriter($"./datas/Players/{e.Author.Id}/Historique.txt");
                sw.WriteLine($"the main text");
                sw.Flush();
                sw.Close();

and i'm doing the same thing when i want to add a new text line

jcotton42•2mo ago

use AppendText to open the file

jcotton42•2mo ago

https://learn.microsoft.com/en-us/dotnet/api/system.io.file.appendtext?view=net-8.0

File.AppendText(String) Method (System.IO)

Creates a StreamWriter that appends UTF-8 encoded text to an existing file, or to a new file if the specified file does not exist.

jcotton42•2mo ago

using var writer = File.AppendText("path");
sw.WriteLine("the main text"); // no need for $ when you're not interpolating
// because we used 'using' above, the file is closed at the end of the scope

using var writer = File.AppendText("path");
sw.WriteLine("the main text"); // no need for $ when you're not interpolating
// because we used 'using' above, the file is closed at the end of the scope

jcotton42•2mo ago

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/statements/using

using statement - ensure the correct use of disposable objects - C#...

Use the C# using statement or declaration to ensure the correct use of disposable objects

LostAngel•2mo ago

and it can add a new line without deleting the existing text in the file?

jcotton42•2mo ago

it's called AppendText for a reason 🙂 from the summary on the docs

Creates a StreamWriter that appends UTF-8 encoded text to an existing file, or to a new file if the specified file does not exist.

LostAngel•2mo ago

okay, i'll try that then uh, now it deletes the second line-

jcotton42•2mo ago

Show your code

LostAngel•2mo ago

LostAngel•2mo ago

this is how i did it @jcotton42

jcotton42•2mo ago

is that the only place you're writing? also, how big is the enclosing block? since the file won't be closed and written until the end of that block

LostAngel•2mo ago

for now there is only two places i use that writing method the enclosing block is just a bit down, 2 rows

LostAngel•2mo ago

@I can't be used on production

Memw•2mo ago

ah let me read

Memw•2mo ago

@LostAngel is this what you wanted?

LostAngel•2mo ago

yeah, and i want it to add more and more textes without having the second text to be overwriten

Memw•2mo ago

in the video I sent that doesn't happen you can keep appending text to the file

using FileStream file = File.Open("test.txt", FileMode.Append);
file.Write("This is a test!\n"u8);

using FileStream file = File.Open("test.txt", FileMode.Append);
file.Write("This is a test!\n"u8);

LostAngel•2mo ago

you don't need the line in writer.WriteLine ?

Memw•2mo ago

the u8 is the same as doing Encoding.UTF8.GetBytes("This is a test!\n") That method is not part of a FileStream that's part of a StreamWriter

LostAngel•2mo ago

yeah, it's part of StreamWriter

Memw•2mo ago

Simply use the File.Open method with the FileMode.Append option and you should have no problem

LostAngel•2mo ago

let me test that then ^^'

Memw•2mo ago

Did it work?

LostAngel•2mo ago

i'm having a code error when typing the code

LostAngel•2mo ago

(sorry it's in french)

Memw•2mo ago

add u8 at the end of the string $".."u8

LostAngel•2mo ago

Memw•2mo ago

without , .

LostAngel•2mo ago

Memw•2mo ago

ah right it's interpolated, interpolated strings can't do that do Encoding.UTF8.GetBytes("..")

LostAngel•2mo ago

like that?

Memw•2mo ago

yeah

LostAngel•2mo ago

i'll test that it still removes the preceding 2nd text

Memw•2mo ago

ok, so basically, if that happens for you (weird asf) I'd say that you could just append two \n\n at the end, so it deletes an empty line and adds a next one

LostAngel•2mo ago

file content before : History of angethemessager : - 754 : name ★ (ressource) file content after : History of angethemessager : - 755 : name ★ (ressource)

Memw•2mo ago

that might be a logic error in another part of the program tho something that deletes the file somewhere else, because AppendText should work and aswell Write from FileStream you maybe opening the file in writemode somewhere else

LostAngel•2mo ago

Memw•2mo ago

ahh

LostAngel•2mo ago

this is the only second time i use the file management there

Memw•2mo ago

you are creating the file and reopening it do this wait

LostAngel•2mo ago

(it's in another .cs file)

Memw•2mo ago

AHH first of all

Memw•2mo ago

name missmatch

Memw•2mo ago

Historigue and Historique

LostAngel•2mo ago

oh 🤦

Memw•2mo ago

so it recreates the file because Historigue never exists and also you could improve efficiency by doing this

LostAngel•2mo ago

well yeah it's that one error that removed all the text each time 🤦

Memw•2mo ago

string historiqueChemin = $"./datas/Players/{e.Author.Id}/Historique.txt";

if (!File.Exists(historiqueChemin))
{
  using FileStream file = File.Create(historiqueChemin);
  file.Write(Encoding.UTF8.GetBytes($"Historique des pulls du joueur {p.PlayerName} :"));
}

string historiqueChemin = $"./datas/Players/{e.Author.Id}/Historique.txt";

if (!File.Exists(historiqueChemin))
{
  using FileStream file = File.Create(historiqueChemin);
  file.Write(Encoding.UTF8.GetBytes($"Historique des pulls du joueur {p.PlayerName} :"));
}

with this you don't call the string interpolation handler two times while checking the file and creating it, and you use the already opened FileStream so you don't close one and open another for no reason @LostAngel

LostAngel•2mo ago

alrighty thanks ^^

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