Getting certain lines of text c#

Question

Hi I was wondering if someone could help me. I would like to able to be to have my program give the user the ability to only read a certain block of code from a text document. However I would like it to be placed behind a button so it can be turned on and off. I have experimented wih different ways of doing this but nothing has made the slightest bit of difference.

This is how my code stands at the moment.

namespace filestream
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private string Read(string file)
        {
            StreamReader reader = new StreamReader(file);
            string data = reader.ReadToEnd();
            reader.Close();

            return data;
        }

        private void btn1_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            DialogResult result = openFileDialog1.ShowDialog();
            if (result == DialogResult.OK)
            {
                string data = Read(openFileDialog1.FileName);
                textBox1.Text = data;

            }
            else
            {
                //do nothing
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
        }
    }
}

Im quite new at this so any help would be greatly appreciated.

Answer 1

If you can use .Net 3.5 and LINQ here is an option...

public static class Tools
{
    public static IEnumerable<string> ReadAsLines(this string filename)
    {
        using (var reader = new StreamReader(filename))
            while (!reader.EndOfStream)
                yield return reader.ReadLine();
    }
}
class Program
{
    static void Main(string[] args)
    {
        var lines = "myfile.txt".ReadAsLines()
                                // you could even add a filter query/formatting
                                .Skip(100).Take(10) //do paging here
                                .ToArray();
    }
}

... extended insanity to show filtering, parsing, and formatting ...

public static class Tools
{
    public static void Foreach<T>(this IEnumerable<T> input, Action<T> action)
    {
        foreach (var item in input)
            action(item);
    }
}
class Program
{
    static void Main(string[] args)
    {
        // the line below is standing in for your text file.  
        // this could be replaced by anything that returns IEnumerable<string>
        var data = new [] { "A 1 3", "B 2 5", "A 1 6", "G 2 7" };

        var format = "Alt: {1} BpM: {2} Type: {0}";

        var lines = from line in data
                    where line.StartsWith("A")
                    let parts = line.Split(' ')
                    let formatted = string.Format(format, parts)
                    select formatted;

        var page = lines.Skip(1).Take(2);

        page.Foreach(Console.WriteLine);
        // at this point the following will be written to the console
        //
        // Alt: 1 BpM: 6 Type: A
        //
    }
}

Answer 2

As far as I can see from what you have there, it should be working. The only thing I can think of why it is not is that your button is connected to the button1_Click routine instead of the btn1_Click routine. If when you click the button and it does not do anything, that is the only reason I can see. The code looks like it is written to ask for the user to select a file and then read the whole file in and place it in the text box.