asp.net读取excel文件的三种方法示例

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;  
}

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();

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 ) ;  
system.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();  
}

//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();
}

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();

//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();
}