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fp34
10年前发布

C# 读取EXCEL文件的三种经典方法

1.方法一:采用OleDB读取EXCEL文件:
把EXCEL文件当做一个数据源来进行数据的读取操作,实例如下:

public DataSet ExcelToDS(string Path)   {   string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source="+ Path +";"+"Extended Properties=Excel 8.0;";   OleDbConnection conn = new OleDbConnection(strConn);   conn.Open();     string strExcel = "";      OleDbDataAdapter myCommand = null;   DataSet ds = null;   strExcel="select * from [sheet1$]";   myCommand = new OleDbDataAdapter(strExcel, strConn);   ds = new DataSet();   myCommand.Fill(ds,"table1");      return ds;   } 

对于EXCEL中的表即sheet([sheet1$])如果不是固定的可以使用下面的方法得到 
string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source="+ Path +";"+"Extended Properties=Excel 8.0;";   OleDbConnection conn = new OleDbConnection(strConn);   DataTable schemaTable = objConn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables,null);   string tableName=schemaTable.Rows[0][2].ToString().Trim();     


另外:也可进行写入EXCEL文件,实例如下:
public void DSToExcel(string Path,DataSet oldds)   {   //先得到汇总EXCEL的DataSet 主要目的是获得EXCEL在DataSet中的结构   string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source ="+path1+";Extended Properties=Excel 8.0" ;   OleDbConnection myConn = new OleDbConnection(strCon) ;   string strCom="select * from [Sheet1$]";   myConn.Open ( ) ;   OleDbDataAdapter myCommand = new OleDbDataAdapter ( strCom, myConn ) ;   ystem.Data.OleDb.OleDbCommandBuilder builder=new OleDbCommandBuilder(myCommand);   //QuotePrefix和QuoteSuffix主要是对builder生成InsertComment命令时使用。   builder.QuotePrefix="[";     //获取insert语句中保留字符(起始位置)   builder.QuoteSuffix="]"; //获取insert语句中保留字符(结束位置)   DataSet newds=new DataSet();   myCommand.Fill(newds ,"Table1") ;   for(int i=0;i<oldds.Tables[0].Rows.Count;i++)   {   //在这里不能使用ImportRow方法将一行导入到news中,因为ImportRow将保留原来DataRow的所有设置(DataRowState状态不变)。     在使用ImportRow后newds内有值,但不能更新到Excel中因为所有导入行的DataRowState!=Added   DataRow nrow=aDataSet.Tables["Table1"].NewRow();   for(int j=0;j<newds.Tables[0].Columns.Count;j++)   {      nrow[j]=oldds.Tables[0].Rows[i][j];   }   newds.Tables["Table1"].Rows.Add(nrow);   }   myCommand.Update(newds,"Table1");   myConn.Close();   }   



2.方法二:引用的com组件:Microsoft.Office.Interop.Excel.dll   读取EXCEL文件
首先是Excel.dll的获取,将Office安装目录下的Excel.exe文件Copy到DotNet的bin目录下,cmd到该目录下,运行 TlbImp EXCEL.EXE Excel.dll 得到Dll文件。 再在项目中添加引用该dll文件.

    //读取EXCEL的方法   (用范围区域读取数据)      private void OpenExcel(string strFileName)      {          object missing = System.Reflection.Missing.Value;          Application excel = new Application();//lauch excel application          if (excel == null)          {              Response.Write("<script>alert('Can't access excel')</script>");          }          else          {              excel.Visible = false; excel.UserControl = true;              // 以只读的形式打开EXCEL文件              Workbook wb = excel.Application.Workbooks.Open(strFileName, missing, true, missing, missing, missing,               missing, missing, missing, true, missing, missing, missing, missing, missing);              //取得第一个工作薄              Worksheet ws = (Worksheet)wb.Worksheets.get_Item(1);                  //取得总记录行数   (包括标题列)              int rowsint = ws.UsedRange.Cells.Rows.Count; //得到行数              //int columnsint = mySheet.UsedRange.Cells.Columns.Count;//得到列数                  //取得数据范围区域 (不包括标题列)               Range rng1 = ws.Cells.get_Range("B2", "B" + rowsint);   //item                  Range rng2 = ws.Cells.get_Range("K2", "K" + rowsint); //Customer              object[,] arryItem= (object[,])rng1.Value2;   //get range's value              object[,] arryCus = (object[,])rng2.Value2;                 //将新值赋给一个数组              string[,] arry = new string[rowsint-1, 2];              for (int i = 1; i <= rowsint-1; i++)              {                  //Item_Code列                  arry[i - 1, 0] =arryItem[i, 1].ToString();                  //Customer_Name列                  arry[i - 1, 1] = arryCus[i, 1].ToString();              }              Response.Write(arry[0, 0] + " / " + arry[0, 1] + "#" + arry[rowsint - 2, 0] + " / " + arry[rowsint - 2, 1]);          }           excel.Quit(); excel = null;          Process[] procs = Process.GetProcessesByName("excel");              foreach (Process pro in procs)          {              pro.Kill();//没有更好的方法,只有杀掉进程          }          GC.Collect();      }




3.方法三:将EXCEL文件转化成CSV(逗号分隔)的文件,用文件流读取(等价就是读取一个txt文本文件)。
           先引用命名空间:using System.Text;和using System.IO;             FileStream fs = new FileStream("d:\\Customer.csv", FileMode.Open, FileAccess.Read, FileShare.None);             StreamReader sr = new StreamReader(fs, System.Text.Encoding.GetEncoding(936));                 string str = "";             string s = Console.ReadLine();             while (str != null)             {    str = sr.ReadLine();                  string[] xu = new String[2];                  xu = str.Split(',');                  string ser = xu[0];                   string dse = xu[1];                if (ser == s)                  { Console.WriteLine(dse);break;                  }             }   sr.Close();  



另外也可以将数据库数据导入到一个txt文件,实例如下:
 
             //txt文件名          string fn = DateTime.Now.ToString("yyyyMMddHHmmss") + "-" + "PO014" + ".txt";              OleDbConnection con = new OleDbConnection(conStr);           con.Open();          string sql = "select ITEM,REQD_DATE,QTY,PUR_FLG,PO_NUM from TSD_PO014";                 //OleDbCommand mycom = new OleDbCommand("select * from TSD_PO014", mycon);          //OleDbDataReader myreader = mycom.ExecuteReader(); //也可以用Reader读取数据          DataSet ds = new DataSet();          OleDbDataAdapter oda = new OleDbDataAdapter(sql, con);          oda.Fill(ds, "PO014");          DataTable dt = ds.Tables[0];              FileStream fs = new FileStream(Server.MapPath("download/" + fn), FileMode.Create, FileAccess.ReadWrite);          StreamWriter strmWriter = new StreamWriter(fs);    //存入到文本文件中               //把标题写入.txt文件中           //for (int i = 0; i <dt.Columns.Count;i++)          //{          //    strmWriter.Write(dt.Columns[i].ColumnName + " ");          //}                    foreach (DataRow dr in dt.Rows)          {              string str0, str1, str2, str3;              string str = "|"; //数据用"|"分隔开              str0 = dr[0].ToString();              str1 = dr[1].ToString();              str2 = dr[2].ToString();              str3 = dr[3].ToString();              str4 = dr[4].ToString().Trim();              strmWriter.Write(str0);              strmWriter.Write(str);              strmWriter.Write(str1);              strmWriter.Write(str);              strmWriter.Write(str2);              strmWriter.Write(str);              strmWriter.Write(str3);              strmWriter.WriteLine(); //换行          }          strmWriter.Flush();          strmWriter.Close();          if (con.State == ConnectionState.Open)          {              con.Close();          }