C#操作.csv文件Demo

1.使用OleDB操作.csv文件,比较费时

        public static DataTable GetDataTableFromCsv(string path,bool isFirstRowHeader)
        {
            string header = isFirstRowHeader ? "Yes" : "No";

            string pathOnly = Path.GetDirectoryName(path);//得到文件夹路径，相当于得到要操作的“数据库”
            string fileName = Path.GetFileName(path);//得到文件名，相当于得到要操作的数据库中的数据表

            string sql = @"select * from ["+fileName+"]";//sql语句
            //操作数据库的流程
            using (OleDbConnection con=new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + pathOnly +";Extended Properties="Text;HDR=" + header + """))
            {
                using (OleDbCommand cmd=new OleDbCommand(sql,con))
                {
                    using (OleDbDataAdapter adapter=new OleDbDataAdapter(cmd))
                    {
                        DataTable dt=new DataTable();
                        dt.Locale=CultureInfo.CurrentCulture;
                        adapter.Fill(dt);
                        return dt;
                    }
                }
            }         
        }

2. 使用文件流操作.csv文件，费时短（txt文件也可以）

        public static DataTable ConvertCsvToDataTable(string fileName)
        {
            DataTable dt=new DataTable();
            using (StreamReader sr=new StreamReader(fileName,Encoding.UTF8))
            {
                string[] headers = sr.ReadLine().Split(',');//处理头部标题
                foreach (string header in headers)
                {
                    dt.Columns.Add(header);
                }
                while (!sr.EndOfStream)
                {
                    string[] rows = sr.ReadLine().Split(',');
                    DataRow dr = dt.NewRow();
                    for (int i = 0; i < headers.Length; i++)
                    {
                        dr[i] = rows[i];
                    }
                    dt.Rows.Add(dr);
                }
            }
            return dt;
        }

3.winform中应用

        private void btnGet_Click(object sender, EventArgs e)
        {
            //打开文件对话框
            OpenFileDialog ofd=new OpenFileDialog() {Filter = "Csv文件|*.csv|Excel文件|*.xls|所有文件|*.*", InitialDirectory = @"C:UsersLWP1398Desktop",RestoreDirectory = true};
            if (ofd.ShowDialog()==DialogResult.OK)
            {
                string fileName = ofd.FileName;
                //dgv.DataSource = GetDataTableFromCsv(fileName, true);
                dgv.DataSource = ConvertCsvToDataTable(fileName);
            }
            MessageBox.Show("ok");
        }