C#操作.csv文件Demo

1.使用OleDB操作.csv文件,比较费时

 1         public static DataTable GetDataTableFromCsv(string path,bool isFirstRowHeader)
 2         {
 3             string header = isFirstRowHeader ? "Yes" : "No";
 4 
 5             string pathOnly = Path.GetDirectoryName(path);//得到文件夹路径，相当于得到要操作的“数据库”
 6             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
 7 
 8             string sql = @"select * from ["+fileName+"]";//sql语句
 9             //操作数据库的流程
10             using (OleDbConnection con=new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + pathOnly +";Extended Properties="Text;HDR=" + header + """))
11             {
12                 using (OleDbCommand cmd=new OleDbCommand(sql,con))
13                 {
14                     using (OleDbDataAdapter adapter=new OleDbDataAdapter(cmd))
15                     {
16                         DataTable dt=new DataTable();
17                         dt.Locale=CultureInfo.CurrentCulture;
18                         adapter.Fill(dt);
19                         return dt;
20                     }
21                 }
22             }         
23         }

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2. 使用文件流操作.csv文件，费时短（txt文件也可以）

 1         public static DataTable ConvertCsvToDataTable(string fileName)
 2         {
 3             DataTable dt=new DataTable();
 4             using (StreamReader sr=new StreamReader(fileName,Encoding.UTF8))
 5             {
 6                 string[] headers = sr.ReadLine().Split(',');//处理头部标题
 7                 foreach (string header in headers)
 8                 {
 9                     dt.Columns.Add(header);
10                 }
11                 while (!sr.EndOfStream)
12                 {
13                     string[] rows = sr.ReadLine().Split(',');
14                     DataRow dr = dt.NewRow();
15                     for (int i = 0; i < headers.Length; i++)
16                     {
17                         dr[i] = rows[i];
18                     }
19                     dt.Rows.Add(dr);
20                 }
21             }
22             return dt;
23         }

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3.winform中应用

 1         private void btnGet_Click(object sender, EventArgs e)
 2         {
 3             //打开文件对话框
 4             OpenFileDialog ofd=new OpenFileDialog() {Filter = "Csv文件|*.csv|Excel文件|*.xls|所有文件|*.*", InitialDirectory = @"C:UsersLWP1398Desktop",RestoreDirectory = true};
 5             if (ofd.ShowDialog()==DialogResult.OK)
 6             {
 7                 string fileName = ofd.FileName;
 8                 //dgv.DataSource = GetDataTableFromCsv(fileName, true);
 9                 dgv.DataSource = ConvertCsvToDataTable(fileName);
10             }
11             MessageBox.Show("ok");
12         }

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