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 = ; 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:\Users\LWP1398\Desktop",RestoreDirectory = true};
             if (ofd.ShowDialog()==DialogResult.OK)
             {
                 string fileName = ofd.FileName;
                 //dgv.DataSource = GetDataTableFromCsv(fileName, true);
                 dgv.DataSource = ConvertCsvToDataTable(fileName);
             }
             MessageBox.Show("ok");
         }