Appendtext not working

Question

So I'm trying to make a program that calculates and saves your BMI into a file. I tried using appendtext like this.

StreamWriter logboekBMI = new StreamWriter(path + "Logbmi.txt");
logboekBSA.Close();

logboekBMI = File.AppendText(path + "Logbmi.txt");
logboekBMI.WriteLine("BMI: " + bmi.getBMI());
logboekBMI.Close();

And I read the file to a text box like this:

StreamReader logbmi = new StreamReader(path + "Logbmi.txt");
txtLogboek.Text = logbmi.ReadToEnd();

It deletes the line that was already in the file and inserts the new one. It never appends.

This code doesn't work at all, where have you copied it from? All you need is the one line `File.AppendAllText("C:\path\to\file\Logbmi.txt", "The text to add");` — Equalsk, Feb 12 '16 at 17:00
Forgot to say then you just need `File.ReadAllText("C:\path\to\file\Logbmi.txt");` to get it back again — Equalsk, Feb 12 '16 at 17:06
Possible duplicate of [Append lines to a file using a StreamWriter](http://stackoverflow.com/questions/7306214/append-lines-to-a-file-using-a-streamwriter) — user1666620, Feb 12 '16 at 17:11

score 1 · Accepted Answer · answered Feb 12 '16 at 17:04

If I understand the question correctly, you want to write text to a file without overwriting any text that is already there.

In that case, you need to define your StreamWriter like so:

StreamWriter logboekBMI = new StreamWriter(path + "Logbmi.txt", true);

The true parameter means that you want to append text to the file. Without it, you are overwriting the file every time you create a new StreamWriter.

score 0 · Answer 2 · answered Feb 12 '16 at 17:11

Your code seems over complicated for what you want to do. You only need two lines of code, one to save the text and one to read it.

Save text: File.AppendAllText

Opens a file, appends the specified string to the file, and then closes the file. If the file does not exist, this method creates a file, writes the specified string to the file, then closes the file.

File.AppendAllText("C:\path\to\file\Logbmi.txt", "The BMI to add");

Read text: File.ReadAllText

Opens a text file, reads all lines of the file into a string, and then closes the file.

txtLogboek.Text = File.ReadAllText("C:\path\to\file\Logbmi.txt");

Appendtext not working

2 Answers2