.NET读取Excel文件的三种方法的区别

ASP.NET读取Excel文件方法一: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();
}

ASP.NET读取Excel文件方法二: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。

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(); 
}

ASP.NET读取Excel文件方法三: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();
}

posted @ 2016-12-07 10:37  程序员新兵  阅读(9020)  评论(0编辑  收藏  举报