How do I include a line at the beginning of a text file? [closed]

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How do I include a line at the beginning of a text file? [closed]

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#1 by (2 votes)

1

My system generates a text file, and based on the sum of one information in each line, it calculates a check digit.

However, this result should be in the first line of the file, how can I include this line at the beginning?

c# asp.net-mvc

asked by anonymous 28.08.2017 / 16:00

1 answer

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score 2 · Accepted Answer

Simple. You only need

Read the entire file and save it to a list of string , where each line represents a string in the list

Insert the new line in position 0 of the list

Write all strings of the list in the file

const string nomeArquivo = "arquivo.txt";

List<string> linhas = File.ReadAllLines(nomeArquivo).ToList(); // Passo 1
linhas.Insert(0, "Primeira linha"); // Passo 2
File.WriteAllLines(nomeArquivo, linhas); // Passo 3