使用C＃在Windows窗体应用程序上读取和显示CSV文件中的数据

Question

I have written the following code for reading data from .csv file:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace CSVRead
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void buttonRead_Click(object sender, EventArgs e)
        {
            DataTable dataTable = new DataTable();
            dataTable.Columns.Add("Username");
            dataTable.Columns.Add("Password");
            dataTable.Columns.Add("MachineID");
            string filePath = textBox1.Text;
            StreamReader streamReader = new StreamReader(filePath);
            string[] totalData = new string[File.ReadAllLines(filePath).Length];
            totalData = streamReader.ReadLine().Split(',');
            while (!streamReader.EndOfStream)
            {
                totalData = streamReader.ReadLine().Split(',');
                dataTable.Rows.Add(totalData[0], totalData[1], totalData[2]);
            }
            dataGridView1.DataSource = dataTable;
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
    }
}

Here is my CSV File data (readCSV.csv):

Username, Password, MachineID
abc, abc, 123
jkl, jkl, 789
rst, rst, 456

I have a dataGridView in my Windows Form Application (see image link below as I haven't accumulated enough reputation to post an image) and want to display data from CSV file in this grid view. This code isn't throwing any error/warning but it is simply not executing the way it should. On clicking the Find button the data is not getting displayed in the dataGridView . I am using Visual Studio 2013 Professional.

Silly Me: Oops!!! The above code is working absolutely fine... I was writing my code on Remote machine and I stored my file on local machine. Also, the name of button click event was mistyped.

NOTE: The answer has been marked as accepted because its logic works too. The code written above in my question is also a working absolutely fine

Answer 1

Here is working example to solve your problem.but before you start you should know few things while reading CVS files or excel files. For excel file always first row is the name of columns so you do not need to add columns to Data-table manually

 try
            {
                // your code here 
     string CSVFilePathName = @"path and file name";
                string[] Lines = File.ReadAllLines(CSVFilePathName);
                string[] Fields;
                Fields = Lines[0].Split(new char[] { ',' });
                int Cols = Fields.GetLength(0);
                DataTable dt = new DataTable();
                //1st row must be column names; force lower case to ensure matching later on.
                for (int i = 0; i < Cols; i++)
                    dt.Columns.Add(Fields[i].ToLower(), typeof(string));
                DataRow Row;
                for (int i = 1; i < Lines.GetLength(0); i++)
                {
                    Fields = Lines[i].Split(new char[] { ',' });
                    Row = dt.NewRow();
                    for (int f = 0; f < Cols; f++)
                        Row[f] = Fields[f];
                    dt.Rows.Add(Row);
                }
                dataGridClients.DataSource = dt;  
 }
            catch (Exception ex )
            {
                MessageBox.Show("Error is " + ex.ToString());
                throw;
            }

Answer 2

First check the autogenerateColumns on dataGridView. Next check if your datatable is correcting being filled.

Check this example, can help you a lot: Faster way of reading csv to grid