C#：对csv文件的读写操作

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Data.OleDb;
using System.Data;
using System.Windows.Forms;
//一个csv的读写操作类
namespace WindowsFormsApplication1
{
    public class CsvRw
    {

        public static DataTable OpenCSV(string filePath)
        {
            DataTable dt = new DataTable();
            FileStream fs = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
            StreamReader sr = new StreamReader(fs, Encoding.Default);

            string strLine = "";
            //记录每行记录中的各字段内容
            string[] aryLine = null;
            string[] tableHead = null;
            //标示列数
            int columnCount = 0;
            //标示是否是读取的第一行
            bool IsFirst = true;

            int hangshu=0;

            //  逐行读取CSV中的数据
            while ((strLine = sr.ReadLine()) != null)
            {
                if (IsFirst == true)
                {
                    tableHead = strLine.Split(‘,‘);
                    IsFirst = false;
                    columnCount = tableHead.Length;
                    for (int i = 0; i < columnCount; i++)
                    {
                        tableHead[i] = tableHead[i].Replace("\"", "");
                        DataColumn dc = new DataColumn(tableHead[i]);
                        dt.Columns.Add(dc);
                    }
                }
                else
                {
                    aryLine = strLine.Split(‘,‘);
                    DataRow dr = dt.NewRow();
                    for (int j = 0; j < columnCount; j++)
                    {
                        dr[j] = aryLine[j].Replace("\"", "");
                    }
                    dt.Rows.Add(dr);
                }
                hangshu += 1;

                //Console.WriteLine(dt.Rows.Count);
            }

            MessageBox.Show(dt.Rows.Count.ToString()+"行数");
            //
            //if (aryLine != null && aryLine.Length > 0)
            //{
            //    dt.DefaultView.Sort = tableHead[2] + " " + "DESC";
            //}
            sr.Close();
            fs.Close();
            return dt;
        }

        /// <summary>
        /// 写入
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="fullFileName"></param>
        /// <returns></returns>
        public static Boolean SaveCSV(DataTable dt, string fullFileName)
        {
            Boolean r = false;
            FileStream fs = new FileStream(fullFileName, System.IO.FileMode.Create, System.IO.FileAccess.Write);
            StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);
            string data = "";

            //写出列名称
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                data += dt.Columns[i].ColumnName.ToString();
                if (i < dt.Columns.Count - 1)
                {
                    data += ",";
                }
            }
            sw.WriteLine(data);

            //写出各行数据
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                data = "";
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    data += dt.Rows[i][j].ToString();
                    if (j < dt.Columns.Count - 1)
                    {
                        data += ",";
                    }
                }
                sw.WriteLine(data);
            }
            sw.Close();
            fs.Close();

            r = true;
            return r;
        }

    }
}