Copying text from one text file to another

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Copying text from one text file to another

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#1 by (4 votes)

4

I wanted to copy the text from one text file to another with a different name and add one - at the beginning of the line of the text file.

For example:

I have a text file with the following text "0000192" and when copying it to another text file I wanted to get it "-0000192".

But I do not know how I can do this.

I'm creating the first text file like this:

string devolta = Convert.ToString((bsoItemTrans.Transaction.TotalAmount * 100).ToString("-000000000"));
System.IO.File.WriteAllText(@"C:\movedir\SUBTOTALE.txt", devolta);

c#

asked by anonymous 19.10.2017 / 17:17

1 answer

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score 4 · Accepted Answer

All you have to do is:

Read all rows from the first file and put it in a collection of strings

Create a new collection where each row is prefixed with -

Save this new collection to a file

Code:

var linhas = File.ReadAllLines("primeiroArquivo.txt"); // Passo 1
linhas = linhas.Select(l => $"-{l}").ToArray();        // Passo 2
File.WriteAllLines("novoArquivo.txt", linhas);         // Passo 3

Obviously it can be turned into one-liner :

File.WriteAllLines("a2.txt", File.ReadAllLines("a1.txt").Select(l => $"-{l}").ToArray());