C#如何读取EXCEL文件，本文就为大家带来三种比较经典的C#读取Excel的方法，一起来看看吧。
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();
}
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。 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 applicationif (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); //itemRange rng2 = ws.Cells.get_Range("K2", "K" + rowsint); //Customerobject[,] arryItem= (object[,])rng1.Value2; //get range's valueobject[,] 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();
}
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();
}
