C# Text File Reading

Hi Raskesh.

Here is a solution that may provide you ideas and inspiration:

Application Start:

Getting the Data Text File

File Read and Data Display

Code that makes it all happen:

using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
namespace Sandbox2
{
public partial class MyMainForm : Form
{
public MyMainForm()
{
InitializeComponent();
}
private void MyMainForm_Load(object sender, EventArgs e)
{
SetupListView();
}
private void SetupListView()
{
lvwFileContent.Columns.Clear();
lvwFileContent.Columns.Add("Col1", 75, HorizontalAlignment.Left);
lvwFileContent.Columns.Add("Col2", 75, HorizontalAlignment.Left);
lvwFileContent.Columns.Add("Col3", 75, HorizontalAlignment.Left);
lvwFileContent.Columns.Add("Col4", 75, HorizontalAlignment.Left);
lvwFileContent.Columns.Add("Col5", 75, HorizontalAlignment.Left);
lvwFileContent.Columns.Add("Col6", 75, HorizontalAlignment.Left);
lvwFileContent.Columns.Add("Col7", 75, HorizontalAlignment.Left);
}
private void btnGo_Click(object sender, EventArgs e)
{
// StreamReader best suited for text files
StreamReader fileReader = null;
// Open File Dialog provides the means get the file path
OpenFileDialog ofd = new OpenFileDialog();
ofd.InitialDirectory = @"C:\";
ofd.Filter = "Text Files (*.txt)|*.txt|All files (*.*)|*.*";
ofd.Multiselect = false;
// show file dialog
if (ofd.ShowDialog() == DialogResult.OK)
{
try
{
// make sure you a file path value
if (ofd.FileName != null)
{
string filePath = ofd.FileName;
// get your StreamReader ready to work
// by opening the file
fileReader = File.OpenText(filePath);
// using the StreamReader
// atuo disposing of resources after use
using (fileReader)
{
// loop until you get to the end of the stream
// then stop
while (fileReader.EndOfStream==false)
{
// get the first line in the text file
string line = fileReader.ReadLine();
// divide the line into parts
// each part will be a value in a column
string[] elements = line.Split(' ');
// get a loop counter so we know when to create
// listviewitem vs listviewitem.subitem
int loop = 0;
// create listviewitem
ListViewItem i = new ListViewItem();
// go through all the parts one at a time
foreach(string element in elements)
{
// discard anything that is white space
string value = element.Trim();
if (value.Length > 0)
{
// populate the listivewitem
if (loop == 0)
{
i.Text = value;
}
else
{
// create and populate a listviewitem subitem
ListViewItem.ListViewSubItem s = new ListViewItem.ListViewSubItem();
s.Text = value;
i.SubItems.Add(s);
}
}
// advance the loop count so that
// additional foreach loops create
// listviewitem subitems
loop++;
}
// add the final listviewitem
// to the listview control
lvwFileContent.Items.Add(i);
}
}
}
}
catch (Exception ex)
{
MessageBox.Show($"Error: Awwww.. Nutz! Something's wrong! \n Check it out: {ex.Message }");
}
}
}
}
}

Hope this helped you

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Bhairab Dutt8y ago
Accepted answer
Hi ,

Please see the below link .

https://stackoverflow.com/questions/8037070/whats-the-fastest-way-to-read-a-text-file-line-by-line

Hope its help to you .
Thanks
James Axsom8y ago
Hi Raskesh.
Here is a solution that may provide you ideas and inspiration:

Application Start:

Getting the Data Text File

File Read and Data Display

Code that makes it all happen:
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace Sandbox2
{
    public partial class MyMainForm : Form
    {


        public MyMainForm()
        {
            InitializeComponent();

        }

        private void MyMainForm_Load(object sender, EventArgs e)
        {
            SetupListView();
        }

        private void SetupListView()
        {
            lvwFileContent.Columns.Clear();
            lvwFileContent.Columns.Add("Col1", 75, HorizontalAlignment.Left);
            lvwFileContent.Columns.Add("Col2", 75, HorizontalAlignment.Left);
            lvwFileContent.Columns.Add("Col3", 75, HorizontalAlignment.Left);
            lvwFileContent.Columns.Add("Col4", 75, HorizontalAlignment.Left);
            lvwFileContent.Columns.Add("Col5", 75, HorizontalAlignment.Left);
            lvwFileContent.Columns.Add("Col6", 75, HorizontalAlignment.Left);
            lvwFileContent.Columns.Add("Col7", 75, HorizontalAlignment.Left);

        }

        private void btnGo_Click(object sender, EventArgs e)
        {
            // StreamReader best suited for text files
            StreamReader fileReader = null;
            // Open File Dialog provides the means get the file path
            OpenFileDialog ofd = new OpenFileDialog();

            ofd.InitialDirectory = @"C:\";
            ofd.Filter = "Text Files (*.txt)|*.txt|All files (*.*)|*.*";
            ofd.Multiselect = false;

            // show file dialog
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    // make sure you a file path value
                    if (ofd.FileName != null)
                    {
                        string filePath = ofd.FileName;

                        // get your StreamReader ready to work
                        // by opening the file
                        fileReader = File.OpenText(filePath);

                        // using the StreamReader
                        // atuo disposing of resources after use
                        using (fileReader)
                        {
                            // loop until you get to the end of the stream
                            // then stop
                            while (fileReader.EndOfStream==false)
                            {
                                // get the first line in the text file
                                string line = fileReader.ReadLine();
                                // divide the line into parts
                                // each part will be a value in a column
                                string[] elements = line.Split(' ');
                                // get a loop counter so we know when to create
                                // listviewitem vs listviewitem.subitem
                                int loop = 0;

                                // create listviewitem
                                ListViewItem i = new ListViewItem();

                                // go through all the parts one at a time
                                foreach(string element in elements)
                                {
                                    // discard anything that is white space
                                    string value = element.Trim();
                                    if (value.Length > 0)
                                    {
                                        // populate the listivewitem
                                        if (loop == 0)
                                        {
                                            i.Text = value;
                                        }
                                        else
                                        {
                                            // create and populate a listviewitem subitem
                                            ListViewItem.ListViewSubItem s = new ListViewItem.ListViewSubItem();
                                            s.Text = value;
                                            i.SubItems.Add(s);
                                        }
                                    }

                                    // advance the loop count so that
                                    // additional foreach loops create
                                    // listviewitem subitems
                                    loop++;
                                }

                                // add the final listviewitem
                                // to the listview control
                                lvwFileContent.Items.Add(i);
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"Error: Awwww.. Nutz! Something's wrong! \n Check it out: {ex.Message }");
                }
            }
        }
    }
}
Hope this helped you