C#读取Excel文件的几种方法

oledb

使用第三方dll吧，比如npoi
//将Excel表格中某7a64e59b9ee7ad94366一sheet中内容放于dataGrid中显示示例:
/*
string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = f:\\表.xls;Extended Properties=Excel 8.0";
OleDbConnection myConn = new OleDbConnection(strCon);
string strCom = " SELECT * FROM [表$] ";
myConn.Open();
OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, myConn);
DataSet myDataSet;
myDataSet = new DataSet();
myCommand.Fill(myDataSet, "[表$]");
myConn.Close();

this.dataGridView1.DataSource = myDataSet.Tables[0];
*/

1.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!=AddedDataRow 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();}

2.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e5a48de588b67a686964616f365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。 再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();}

3.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(); }