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學習啦 > 學習電腦 > 工具軟件 > 辦公軟件學習 > Excel教程 > Excel2013教程 > NET讀取Excel文件的方法

NET讀取Excel文件的方法

時間: 張偉670 分享

NET讀取Excel文件的方法

  如何使得ASP.NET讀取Excel文件更加高效呢,下面小編就來告訴你三種.NET讀取Excel文件的方法。

  ASP.NET讀取Excel文件方法一:采用OleDB讀取Excel文件:

  把Excel文件當做一個數(shù)據(jù)源來進行數(shù)據(jù)的讀取操作,實例如下:

  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;

  }

  對于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

  代碼如下:

  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:也可進行寫入Excel文件,實例如下:

  代碼如下:

  public void DSToExcel(string Path,DataSet oldds) {

  //先得到匯總Excel的DataSet 主要目的是獲得Excel在DataSet中的結(jié)構(gòu)

  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主要是對builder生成InsertComment命令時使用。

  builder.QuotePrefix="["; //獲取insert語句中保留字符(起始位置)

  builder.QuoteSuffix="]"; //獲取insert語句中保留字符(結(jié)束位置)

  DataSet newds=new DataSet();

  myCommand.Fill(newds ,"Table1") ;

  for(int i=0;i

  {

  //在這里不能使用ImportRow方法將一行導(dǎo)入到news中,

  //因為ImportRow將保留原來DataRow的所有設(shè)置(DataRowState狀態(tài)不變)。

  //在使用ImportRow后newds內(nèi)有值,但不能更新到Excel中因為所有導(dǎo)入行的DataRowState!=Added

  DataRow nrow=aDataSet.Tables["Table1"].NewRow();

  for(int j=0;j

  {

  nrow[j]=oldds.Tables[0].Rows[i][j];

  }

  newds.Tables["Table1"].Rows.Add(nrow);

  }

  myCommand.Update(newds,"Table1");

  myConn.Close();

  }

  ASP.NET讀取Excel文件方法二:引用的com組件:

Microsoft.Office.Interop.Excel.dll讀取Excel文件

  首先是Excel.dll的獲取,將Office安裝目錄下的Excel.exe文件Copy到DotNet的bin目錄下,cmd到該目錄下,運行 TlbImp EXCEL.EXE Excel.dll 得到Dll文件。

  在項目中添加引用該dll文件.

  代碼如下:

  //讀取EXCEL的方法 (用范圍區(qū)域讀取數(shù)據(jù))

  private void OpenExcel(string strFileName) {

  object missing = System.Reflection.Missing.Value;

  Application excel = new Application();//lauch excel application

  if (excel == null)

  {

  Response.Write("");

  }

  else

  {

  excel.Visible = false;

  excel.UserControl = true; // 以只讀的形式打開EXCEL文件

  Workbook wb = excel.Application.Workbooks.Open(strFileName, missing, true, missing, missing, missing,missing, missing, missing, true, missing, missing, missing, missing, missing); //取得第一個工作薄

  Worksheet ws = (Worksheet)wb.Worksheets.get_Item(1); //取得總記錄行數(shù) (包括標題列)

  int rowsint = ws.UsedRange.Cells.Rows.Count; //得到行數(shù)

  //int columnsint = mySheet.UsedRange.Cells.Columns.Count;//得到列數(shù)

  //取得數(shù)據(jù)范圍區(qū)域 (不包括標題列)

  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; //將新值賦給一個數(shù)組

  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();//沒有更好的方法,只有殺掉進程

  }

  GC.Collect();

  }

  ASP.NET讀取Excel文件方法三:將Excel文件轉(zhuǎn)化成CSV

  先引用命名空間:

  代碼如下:

  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();

  另外也可以將數(shù)據(jù)庫數(shù)據(jù)導(dǎo)入到一個txt文件,實例如下:

  代碼如下:

  //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讀取數(shù)據(jù)

  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

  //把標題寫入.txt文件中

  //for (int i = 0; i

  //{

  // strmWriter.Write(dt.Columns[i].ColumnName + " ");

  //}

  foreach (DataRow dr in dt.Rows)

  {

  string str0, str1, str2, str3;

  string str = "|"; //數(shù)據(jù)用"|"分隔開

  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(); //換行

  }

  strmWriter.Flush();

  strmWriter.Close();

  if (con.State == ConnectionState.Open)

  {

  con.Close();

  }

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