C # Four Methods for reading CSV files

Source: Internet
Author: User

Code 1:

Use System. Web. UI. HtmlControls. HtmlInputFile to select the handle file.

The code in the button click event is used to read the file content after the file is selected.

  1      System.Web.HttpPostedFile input = Request.Files[0];
2
3      if (input != null && input.ContentLength != 0)
4      {
5        string path = input.FileName.ToString();
6        System.IO.StreamReader reader = new System.IO.StreamReader(path);
7
8        reader.Peek();
9        while (reader.Peek() > 0)
10        {
11          string str = reader.ReadLine();
12          string[] split = str.Split(,);
13          if (split[0] != "" && split[1] != "")
14          {
15            System.Data.DataSet ds = new DataSet();
16            System.Data.DataRow dr = ds.Tables[0].NewRow();
17            dr[0] = split[0];
18            dr[1] = split[1];
19            ds.Tables[0].Rows.Add(dr);
20          }
21        }
22      }

CODE 2:

Just now, read the table directly.

 SELECT  * 
 INTO  theImportTable 
 FROM 
 OPENROWSET(MSDASQL, 
 Driver={Microsoft  Text  Driver  (*.txt;  *.csv)};DEFAULTDIR=D:;Extensions=CSV;, 
 SELECT  *  FROM  CSVFile.csv)

CODE 3:

OPENROWSET(MSDASQL, 
 Driver={Microsoft  Text  Driver  (*.txt;  *.csv)};DEFAULTDIR=D:;Extensions=CSV;, 
 SELECT  *  FROM  CSVFile.csv) 

Complicated.

Files are operated as a database, using the ole driver

CODE 4:

1      int intColCount = 0;
2      DataTable mydt = new DataTable("myTableName");
3
4      DataColumn mydc;
5      DataRow mydr;
6
7      string strpath = "";
8      string strline;
9      string[] aryline;
10
11      System.IO.StreamReader mysr = new System.IO.StreamReader(strpath);
12
13      while ((strline = mysr.ReadLine()) != null)
14      {
15        aryline = strline.Split(new char[] { | });
16
17        intColCount = aryline.Length;
18        for (int i = 0; i < aryline.Length; i++)
19        {
20          mydc = new DataColumn(aryline[i]);
21          mydt.Columns.Add(mydc);
22        }
23
24        mydr = mydt.NewRow();
25        for (int i = 0; i < intColCount; i++)
26        {
27          mydr[i] = aryline[i];
28        }
29        mydt.Rows.Add(mydr);
30      } 

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