CsvHelper---C#關於CSV檔案的匯入和匯出以及轉化
阿新 • • 發佈:2019-01-28
using System.Data; using System.IO; namespace DotNet.Utilities { /// <summary> /// CSV檔案轉換類 /// </summary> public static class CsvHelper { /// <summary> /// 匯出報表為Csv /// </summary> /// <param name="dt">DataTable</param> /// <param name="strFilePath">物理路徑</param> /// <param name="tableheader">表頭</param> /// <param name="columname">欄位標題,逗號分隔</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[j].ToString(); } strmWriterObj.WriteLine(strBufferLine); } strmWriterObj.Close(); return true; } catch { return false; } } /// <summary> /// 將Csv讀入DataTable /// </summary> /// <param name="filePath">csv檔案路徑</param> /// <param name="n">表示第n行是欄位title,第n+1行是記錄開始</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 = split; } dt.Rows.Add(dr); } } return dt; } } }