Save datagrid information to text file shows an empty file-CodePudding

I have code that allows you to save datagrid information in visual studio into a text file but the datagrid is filled out and it just shows nothing in the text file

Code:

private void button3_Click(object sender, EventArgs e)
{
        SaveFileDialog sfd = new SaveFileDialog();
        sfd.FileName = "untitled.txt";
        sfd.DefaultExt = "txt";
        sfd.Filter = "txt files (*.text) |*.txt*";

        if (sfd.ShowDialog() == DialogResult.OK)
        {
            Stream fileStream = sfd.OpenFile();
            StreamWriter sw = new StreamWriter(fileStream);

            for(int i = 0; i <  dataGridView1.Rows.Count - 1; i  ) //rows
            {
                for (int j = 0; j < dataGridView1.Columns.Count; j  ) // columns
                {
                    sw.Write("\t", dataGridView1.Rows[i].Cells[j].Value.ToString()   "\t"   "|");
                }
                sw.WriteLine("");
            }
            sw.Close();
            fileStream.Close();
        }
}

CodePudding user response：

In my small tests, it appears the “\t” is getting misinterpreted. Fortunately, a simple fix is to simply make a Tab string and use it like…

string tab = "\t";

Then…

sw.Write( tab   dataGridView1.Rows[i].Cells[j].Value.ToString()   tab   "|");

In addition, it is a good idea to implement using statements to ensure the resources get closed and disposed of properly. Something like…

private void button2_Click(object sender, EventArgs e) {
  using (SaveFileDialog sfd = new SaveFileDialog()) {
    sfd.FileName = "untitled.txt";
    sfd.DefaultExt = "txt";
    sfd.Filter = "txt files (*.text) |*.txt*";
    string tab = "\t";
    if (sfd.ShowDialog() == DialogResult.OK) {
      using (Stream fileStream = sfd.OpenFile()) {
        using (StreamWriter sw = new StreamWriter(fileStream)) {
          for (int i = 0; i < dataGridView1.Rows.Count; i  ) {
            if (!dataGridView1.Rows[i].IsNewRow) {
              for (int j = 0; j < dataGridView1.Columns.Count; j  ) {
                sw.Write(tab   dataGridView1.Rows[i].Cells[j].Value.ToString());
                if (j < dataGridView1.Columns.Count - 1) {
                  sw.Write(tab   "|");
                }
              }
              sw.WriteLine("");
            }
          }
          //sw.Close();
          //fileStream.Close();
        }
      }
    }
  }
}

CodePudding user response：

Here is an option

using System;
using System.IO;
using System.Linq;
using System.Windows.Forms;

namespace YourNamespaceGoesHere
{
    public static class DataGridViewExtensions
    {
        public static void ExportRows(this DataGridView sender, string fileName, string defaultNullValue = "(empty)")
        {
            File.WriteAllLines(fileName, (sender.Rows.Cast<DataGridViewRow>()
                .Where(row => !row.IsNewRow)
                .Select(row => new {
                    row,
                    rowItem = string.Join(",", Array.ConvertAll(row.Cells.Cast<DataGridViewCell>()
                        .ToArray(), c => ((c.Value == null) ? defaultNullValue : c.Value.ToString())))
                })
                .Select(@row => @row.rowItem)));
        }
    }
}

Usage (replace the file name from your SaveFileDialog)

private void ExportButton_Click(object sender, EventArgs e)
{
    dataGridView1.ExportRows("data1.txt");
}