.NET讀取Excel文件的三種方法的區別

ASP.NET讀取Excel文件方法一:採用OleDB讀取Excel文件:sql

把Excel文件當作一個數據源來進行數據的讀取操做,實例以下:數據庫

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;
}數組

對於Excel中的表即sheet([sheet1$])若是不是固定的能夠使用下面的方法獲得app

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();  ide

另外:也可進行寫入Excel文件,實例以下:ui

public void DSToExcel(string Path,DataSet oldds)   {   
   //先獲得彙總Excel的DataSet 主要目的是得到Excel在DataSet中的結構   
 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(結束位置) 
 DataSet newds=new DataSet();
 myCommand.Fill(newds ,"Table1") ;
 for(int i=0;i<oldds.Tables[0].Rows.Count;i++)   
 {    
    //在這裏不能使用ImportRow方法將一行導入到news中,
  //由於ImportRow將保留原來DataRow的全部設置(DataRowState狀態不變)。
  //在使用ImportRow後newds內有值,但不能更新到Excel中由於全部導入行的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();
}spa

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excel

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 獲得Dll文件。進程

在項目中添加引用該dll文件.//讀取EXCEL的方法   (用範圍區域讀取數據)
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);          //取得第一個工做薄  
   Worksheet ws = (Worksheet)wb.Worksheets.get_Item(1);           //取得總記錄行數   (包括標題列)   
   int rowsint = ws.UsedRange.Cells.Rows.Count; //獲得行數         
 //int columnsint = mySheet.UsedRange.Cells.Columns.Count;//獲得列數          
 //取得數據範圍區域  (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(); 
}ip

ASP.NET讀取Excel文件方法三:將Excel文件轉化成CSV(逗號分隔)的文件,用文件流讀取(等價就是讀取一個txt文本文件)。

先引用命名空間:

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();

另外也能夠將數據庫數據導入到一個txt文件,實例以下:

//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();  //也能夠用Reader讀取數據 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 <dt.Columns.Count;i++)  //{  //    strmWriter.Write(dt.Columns[i].ColumnName + "  "); //}  foreach (DataRow dr in dt.Rows)  {       string str0, str1, str2, str3;        string str = "|";  //數據用"|"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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