封装一个CSVHelper

     public class CSVHelper
     {
         /// <summary>
         /// CSV转换成DataTable（OleDb数据库访问方式）
         /// </summary>
         /// <param name="csvPath">csv文件路径</param>
         /// <returns></returns>
         public static DataTable CSVToDataTableByOledb(string csvPath)
         {
             DataTable csvdt = new DataTable("csv");
             if (!File.Exists(csvPath))
             {
                 throw new FileNotFoundException("csv文件路径不存在!");
             }

             FileInfo fileInfo = new FileInfo(csvPath);
             using (OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileInfo.DirectoryName + ";Extended Properties='Text;'"))
             {
                 OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM [" + fileInfo.Name + "]", conn);
                 adapter.Fill(csvdt);
             }
             return csvdt;
         }

         /// <summary>
         /// CSV转换成DataTable（文件流方式）
         /// </summary>
         /// <param name="csvPath">csv文件路径</param>
         /// <returns></returns>
         public static DataTable CSVToDataTableByStreamReader(string csvPath)
         {
             DataTable csvdt = new DataTable("csv");

             int intColCount = ;
             bool blnFlag = true;
             DataColumn column;
             DataRow row;
             string strline = null;
             string[] aryline;

             using (StreamReader reader = new StreamReader(csvPath, FileUtil.GetEncoding(csvPath)))
             {
                 while (!string.IsNullOrEmpty((strline = reader.ReadLine())))
                 {
                     aryline = strline.Split(new char[] { ',' });

                     if (blnFlag)
                     {
                         blnFlag = false;
                         intColCount = aryline.Length;
                         for (int i = ; i < aryline.Length; i++)
                         {
                             column = new DataColumn(aryline[i]);
                             csvdt.Columns.Add(column);
                         }
                         continue;
                     }

                     row = csvdt.NewRow();
                     for (int i = ; i < intColCount; i++)
                     {
                         row[i] = aryline[i];
                     }
                     csvdt.Rows.Add(row);
                 }
             }

             return csvdt;
         }

         /// <summary>
         /// DataTable 生成 CSV
         /// </summary>
         /// <param name="dt">DataTable</param>
         /// <param name="csvPath">csv文件路径</param>
         public static void DataTableToCSV(DataTable dt, string csvPath)
         {
             if (null == dt)
                 return;

             StringBuilder csvText = new StringBuilder();
             StringBuilder csvrowText = new StringBuilder();
             foreach (DataColumn dc in dt.Columns)
             {
                 csvrowText.Append(",");
                 csvrowText.Append(dc.ColumnName);
             }
             csvText.AppendLine(csvrowText.ToString().Substring());

             foreach (DataRow dr in dt.Rows)
             {
                 csvrowText = new StringBuilder();
                 foreach (DataColumn dc in dt.Columns)
                 {
                     csvrowText.Append(",");
                     csvrowText.Append(dr[dc.ColumnName].ToString().Replace(',', ' '));
                 }
                 csvText.AppendLine(csvrowText.ToString().Substring());
             }

             File.WriteAllText(csvPath, csvText.ToString(), Encoding.Default);
         }
     }