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LopezAi
Asked: 2020-09-28 01:55:20 +0800 CST 2020-09-28 01:55:20 +0800 CST

C# read a specific line from a text file

  • 772

I have to display on the screen a specific line of a .txt file, in C#. My code so far is this:

while (!file.EndOfStream)
{
    counter++;

    if (counter == 4) {
        line = file.ReadLine();
        System.Console.WriteLine(line);
    }

}

I have also tried with this code but I get the first line:

 while (!file.EndOfStream)
{
    line = file.ReadLine();
    //System.Console.WriteLine(line);
    if (++counter ==4) break;

}

Also know to see if a specific line could be read but detecting a string of characters.

Properties: 
Name=X 
Path=X 
Version=1.000

The text file looks something like this, I need to read the version, it's just for testing.

c#

2 Answers

  1. Best Answer

    I would do it like this if there are not too many lines:

    int i = 3 // siendo 3 la cuarta linea ya que cuenta desde 0
string resultado = File.ReadAllLines("ruta del fichero")[i];

    To expand on the answer, if you didn't know exactly what line the text you need to search for is on, you could do it like this:

    string resultado = File.ReadAllLines("ruta del fichero").Where(X => X.Contains("Texto")).First();
    • 3

  2. If you need to search for a specific row in a text file, it's best to use ReadAllLinesVeelicus as well recommended in his answer. That way you have string[]the whole file and it is easier to manipulate it.

    As for searching for a specific text, you can make use of LINQ in combination with Containsor StartsWith:

    string fila = File.ReadAllLines(@"rutaDeArchivo")
                    .Where(x=>x.Contains("Version"))
                    .FirstOrDefault(); //Busca la primera fila que contenga el texto

string fila = File.ReadAllLines(@"rutaDeArchivo")
                    .Where(x=>x.StartsWith("Version"))
                    .FirstOrDefault(); //Busca la primera fila que empiece por el texto
    • 2