ASP.NET读取Excel文件的三大方法浅析
最近研究了如何使得ASP.NET读取Excel文件更加高效呢,现总结如下:
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(); }
ASP.NET读取Excel文件的方法就向你介绍到这里,希望对你了解ASP.NET读取Excel文件有所帮助。