Question

The process I currently use to insert a string into a text file is to read the file and modify it as I write the file out again which seems to be how everyone is doing it.

Since .net has such a diverse library I was wondering if there was a specific command for inserting a string at a specific line in a txt file.

I would imagine it would look something like this:

dim file as file
file.open("filePath")

file.insert(string, location) 'this isn't actually an option, I tried

Answer 1

No, there’s nothing specifically to do that in .NET.

You can do it very simply if you’re happy to read all the lines of text in:

var lines = File.ReadAllLines("file.txt").ToList();
lines.Insert(location, text);
File.WriteAllLines("file.txt", lines);

It would be more efficient in terms of memory to write code to copy a line at a time, inserting the new line at the right point while you copy, but that would be more work. If you know your file will be small, I’d go for the above.