常用类-CSV---OLEDB

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

 using System.Data;
 using System.IO;
 using System.Data.OleDb;
 using Aspose.Cells;

 namespace Common
 {
     public class CSV
     {
         /// <summary>
         /// "HDR=Yes;"声名第一行的数据为域名，并非数据。
         /// 这种方式读取csv文件前8条为int类型后面为string类型 则后面数据读取不了
         /// 还存在乱码问题
         /// </summary>
         /// <param name="fullPath"></param>
         /// <returns></returns>
         public static DataTable Read(string fullPath)
         {
             FileInfo fileInfo = new FileInfo(fullPath);
             DataTable table = new DataTable();
             string connstring = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileInfo.DirectoryName + ";Extended Properties='Text;HDR=YES;FMT=Delimited;IMEX=1;'";
             string cmdstring = String.Format("select * from [{0}]", fileInfo.Name);

             using (OleDbConnection conn = new OleDbConnection(connstring))
             {
                 conn.Open();

                 OleDbDataAdapter adapter = new OleDbDataAdapter(cmdstring, conn);
                 adapter.Fill(table);

                 conn.Close();
             }

             return table;
         }

         public static List<string> Read2(string fullpath)
         {
             DataTable table = CSV.Read(fullpath);
             List<string> records = new List<string>();

             foreach (DataRow row in table.Rows)
             {
                 records.Add(row[].ToString());
             }

             return records;
         }

         public static string ExportToCSV(DataTable table)
         {
             StringBuilder sb = new StringBuilder();

             for (int i = ; i < table.Columns.Count; i++)
             {
                 if (i == table.Columns.Count - )
                 {
                     sb.Append(table.Columns[i].Caption);
                 }
                 else
                 {
                     sb.AppendFormat("{0},", table.Columns[i].Caption);
                 }
             }
             sb.Append(Environment.NewLine);

             for (int index = ; index < table.Rows.Count; index++)
             {
                 StringBuilder sb2 = new StringBuilder();
                 DataRow row = table.Rows[index];

                 for (int i = ; i < table.Columns.Count; i++)
                 {

                     string input = row[i].ToString();
                     string format = "{0}";
                     if (input.Contains(","))
                     {
                         format = "\"{0}\"";
                     }

                     if (i == table.Columns.Count - )
                     {
                         sb.Append(String.Format(format, ReplaceSpecialChars(input)));
                     }
                     else
                     {
                         sb.AppendFormat(format + ",", ReplaceSpecialChars(input));
                     }
                 }

                 if (index < table.Rows.Count - )
                     sb.Append(Environment.NewLine);
             }

             return sb.ToString();
         }

         public static void ExportToCSVFile(DataTable table, string filename)
         {
             // using (StreamWriter sw = new StreamWriter(filename, false,Encoding.UTF8))
             using (StreamWriter sw = new StreamWriter(filename, false))
             {
                 string text = ExportToCSV(table);
                 sw.WriteLine(text);
             }
         }

         public static string ReplaceSpecialChars(string input)
         {
             // space -> _x0020_   特殊字符的替换
             // % -> _x0025_
             // # -> _x0023_
             // & -> _x0026_
             // / -> _x002F_
             if (input == null)
                 return "";
             //input = input.Replace(" ", "_x0020_");
             //input.Replace("%", "_x0025_");
             //input.Replace("#", "_x0023_");
             //input.Replace("&", "_x0026_");
             //input.Replace("/", "_x002F_");

             input = input.Replace("\"", "\"\"");

             return input;
         }

         public static DataTable ReadExcel(string fullpath, string sheetname = "sheet1$")
         {
             DataTable table = new DataTable();

             string connectionstring = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR=Yes;IMEX=1;';", fullpath);
             //string cmdstring = "select * from [sheet1$]";
             string cmdstring = "select * from [" + sheetname + "]";

             using (OleDbConnection conn = new OleDbConnection(connectionstring))
             {
                 conn.Open();

                 OleDbDataAdapter adapter = new OleDbDataAdapter(cmdstring, conn);
                 adapter.Fill(table);

                 conn.Close();
             }

             return table;
         }

         public static DataTable ExcelDs(string filenameurl)
         {
             string strConn = String.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR=Yes;IMEX=1;'", filenameurl); ;
             OleDbConnection conn = new OleDbConnection(strConn);
             conn.Open();
             //返回Excel的架构，包括各个sheet表的名称,类型，创建时间和修改时间等　
             DataTable dtSheetName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" });
             //包含excel中表名的字符串数组
             string[] strTableNames = new string[dtSheetName.Rows.Count];
             for (int k = ; k < dtSheetName.Rows.Count; k++)
             {
                 strTableNames[k] = dtSheetName.Rows[k]["TABLE_NAME"].ToString();
             }

             OleDbDataAdapter odda = new OleDbDataAdapter("select * from [" + strTableNames[] + "]", conn);
             DataTable ds = new DataTable(); odda.Fill(ds);

             conn.Close();
             conn.Dispose();
             return ds;
         }

         public static DataTable ReadExcelTopVersion(string fullpath, string sheetname = "sheet1$")
         {
             DataTable table = new DataTable();

             //我测试用下
             //string connectionstring = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR=Yes;IMEX=1;';", fullpath);

             //这个是正确的
             string connectionstring = String.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR=Yes;IMEX=1;'", fullpath);
             //string cmdstring = "select * from [sheet1$]";
             string cmdstring = "select * from [" + sheetname + "]";

             using (OleDbConnection conn = new OleDbConnection(connectionstring))
             {
                 conn.Open();

                 OleDbDataAdapter adapter = new OleDbDataAdapter(cmdstring, conn);
                 adapter.Fill(table);

                 conn.Close();
             }

             return table;
         }

         public static List<string> ReadExcel2(string fullpath)
         {
             List<string> records = new List<string>();
             DataTable table = CSV.ReadExcel(fullpath);

             foreach (DataRow row in table.Rows)
             {
                 records.Add(row[].ToString());
             }

             return records;
         }

         /// <summary>
         /// 使用Aspose方法读取csv文件
         /// 当前8条数据为int类型,后面数据为string类型,会报错
         /// 乱码文件正确读取
         /// </summary>
         /// <param name="fullpath"></param>
         /// <returns></returns>
         public static DataTable ReadCSVByAspose(string fullpath)
         {
             Workbook workbook = new Workbook(fullpath);
             Cells cells = workbook.Worksheets[].Cells;
             DataTable data = cells.ExportDataTable(, , cells.MaxDataRow, cells.MaxDataColumn + , true);
             return data;
         }

         /// <summary>
         /// sun : use ace.oledb, not use jet.oledb
         /// </summary>
         /// <param name="excelFilename"></param>
         /// <returns></returns>
         public static DataTable ReadCSVByACEOLEDB(string excelFilename)
         {
             string connectionString = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\"{0}\";Extended Properties=\"Text\"", Directory.GetParent(excelFilename));
             DataSet ds = new DataSet();
             string fileName = string.Empty;
             using (System.Data.OleDb.OleDbConnection connection = new System.Data.OleDb.OleDbConnection(connectionString))
             {
                 connection.Open();
                 fileName = Path.GetFileName(excelFilename);

                 string strExcel = "select * from " + "[" + fileName + "]";
                 OleDbDataAdapter adapter = new OleDbDataAdapter(strExcel, connectionString);
                 adapter.Fill(ds, fileName);
                 connection.Close();
                 //tableNames.Clear();
             }
             return ds.Tables[fileName];
         }

     }
 }

备注: 需要安装引擎

服务器未安装office软件的时候,使用连接字符串,读取excel失败的解决办法,下载 安装即可

Microsoft Access Database Engine 2010 Redistributable

 

对应的excel连接字符串：

"Provider=Microsoft.Ace.OleDb.12.0;Data Source=" + filepath + ";Extended Properties='Excel 12.0;HDR=YES;IMEX=1'";