csv is a comma separated value format file that stores table data (numbers and text) in plain text. A csv file consists of any number of records separated by a line break character. Each record consists of fields. The separators between fields are other characters or strings, the most common being commas or tabs. In C ා, it is sometimes necessary to read and write the csv file. Therefore, a tool class CsvHelper is encapsulated. In a word, C ා exports data to csv files at a relatively fast speed. Sometimes when exporting Excel files at a very slow speed, you can choose to export the. csv file first, and then open it locally with Excel software.
CsvHelper class mainly uses C ා to operate the Csv file, which mainly contains two methods.
Dt2csv (omitted parameter): import data into CSV file
Csv2dt (omitted parameter): read CSV into DataTable
The specific tool class implementation is as follows:
/// <summary> /// CSV File conversion class /// </summary> public static class CsvHelper { /// <summary> /// Export report as Csv /// </summary> /// <param name="dt">DataTable</param> /// <param name="strFilePath">Physical path</param> /// <param name="tableheader">Header</param> /// <param name="columname">Field title,Comma separation</param> public static bool dt2csv(DataTable dt, string strFilePath, string tableheader, string columname) { try { string strBufferLine = ""; StreamWriter strmWriterObj = new StreamWriter(strFilePath, false, System.Text.Encoding.UTF8); strmWriterObj.WriteLine(tableheader); strmWriterObj.WriteLine(columname); for (int i = 0; i < dt.Rows.Count; i++) { strBufferLine = ""; for (int j = 0; j < dt.Columns.Count; j++) { if (j > 0) strBufferLine += ","; strBufferLine += dt.Rows[i][j].ToString(); } strmWriterObj.WriteLine(strBufferLine); } strmWriterObj.Close(); return true; } catch { return false; } } /// <summary> /// take Csv Read in DataTable /// </summary> /// <param name="filePath">csv File path</param> /// <param name="n">Express the first n Row is field title,The first n+1 Line is record start</param> public static DataTable csv2dt(string filePath, int n, DataTable dt) { StreamReader reader = new StreamReader(filePath, System.Text.Encoding.UTF8, false); int i = 0, m = 0; reader.Peek(); while (reader.Peek() > 0) { m = m + 1; string str = reader.ReadLine(); if (m >= n + 1) { string[] split = str.Split(','); System.Data.DataRow dr = dt.NewRow(); for (i = 0; i < split.Length; i++) { dr[i] = split[i]; } dt.Rows.Add(dr); } } return dt; } }
Note: This article is reproduced from C ා tool class: Csv file conversion class ා IT technology fun house.