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How to use C# Textreader Class

Textreader and TextWriter are the another way to read and write file respectively, even though these are not stream classes. Textreader represents a reader that can read a sequential series of characters. The StreamReader and StreamWriter classes are derived from TextReader and TextWriter classes respectively, which read characters from streams and strings.

The following C# source code shows how to read a file using TextReader.




using System;
using System.Windows.Forms;
using System.IO;
using System.Text;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                string line = null;
                System.IO.TextReader readFile = new StreamReader("C:\\csharp.net-informations.txt");
                while (true)
                {
                    line = readFile.ReadLine();
                    if (line != null)
                    {
                        MessageBox.Show (line);
                    }
                }
                readFile.Close();
                readFile = null;
            }
            catch (IOException ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}






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