C# 读取EXCEL文件的三种经典方法
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:
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public DataSet ExcelToDS(string Path)
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{
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string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source="+ Path +";"+"Extended Properties=Excel 8.0;";
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OleDbConnection conn = new OleDbConnection(strConn);
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conn.Open();
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string strExcel = "";
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OleDbDataAdapter myCommand = null;
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DataSet ds = null;
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strExcel="select * from [sheet1$]";
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myCommand = new OleDbDataAdapter(strExcel, strConn);
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ds = new DataSet();
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myCommand.Fill(ds,"table1");
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return ds;
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}
对于EXCEL中的表即sheet([sheet1$])如果不是固定的可以使用下面的方法得到
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string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source="+ Path +";"+"Extended Properties=Excel 8.0;";
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OleDbConnection conn = new OleDbConnection(strConn);
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DataTable schemaTable = objConn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables,null);
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string tableName=schemaTable.Rows[0][2].ToString().Trim();
另外:也可进行写入EXCEL文件,实例如下:
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public void DSToExcel(string Path,DataSet oldds)
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{
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//先得到汇总EXCEL的DataSet 主要目的是获得EXCEL在DataSet中的结构
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string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source ="+path1+";Extended Properties=Excel 8.0" ;
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OleDbConnection myConn = new OleDbConnection(strCon) ;
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string strCom="select * from [Sheet1$]";
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myConn.Open ( ) ;
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OleDbDataAdapter myCommand = new OleDbDataAdapter ( strCom, myConn ) ;
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ystem.Data.OleDb.OleDbCommandBuilder builder=new OleDbCommandBuilder(myCommand);
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//QuotePrefix和QuoteSuffix主要是对builder生成InsertComment命令时使用。
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builder.QuotePrefix="["; //获取insert语句中保留字符(起始位置)
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builder.QuoteSuffix="]"; //获取insert语句中保留字符(结束位置)
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DataSet newds=new DataSet();
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myCommand.Fill(newds ,"Table1") ;
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for(int i=0;i
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{
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//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)。
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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
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DataRow nrow=aDataSet.Tables["Table1"].NewRow();
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for(int j=0;j
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{
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nrow[j]=oldds.Tables[0].Rows[i][j];
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}
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newds.Tables["Table1"].Rows.Add(nrow);
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}
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myCommand.Update(newds,"Table1");
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myConn.Close();
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}
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.
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//读取EXCEL的方法 (用范围区域读取数据)
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private void OpenExcel(string strFileName)
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{
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object missing = System.Reflection.Missing.Value;
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Application excel = new Application();//lauch excel application
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if (excel == null)
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{
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Response.Write("");
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}
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else
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{
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excel.Visible = false; excel.UserControl = true;
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// 以只读的形式打开EXCEL文件
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Workbook wb = excel.Application.Workbooks.Open(strFileName, missing, true, missing, missing, missing,
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missing, missing, missing, true, missing, missing, missing, missing, missing);
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//取得第一个工作薄
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Worksheet ws = (Worksheet)wb.Worksheets.get_Item(1);
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//取得总记录行数 (包括标题列)
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int rowsint = ws.UsedRange.Cells.Rows.Count; //得到行数
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//int columnsint = mySheet.UsedRange.Cells.Columns.Count;//得到列数
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//取得数据范围区域 (不包括标题列)
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Range rng1 = ws.Cells.get_Range("B2", "B" + rowsint); //item
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Range rng2 = ws.Cells.get_Range("K2", "K" + rowsint); //Customer
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object[,] arryItem= (object[,])rng1.Value2; //get range's value
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object[,] arryCus = (object[,])rng2.Value2;
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//将新值赋给一个数组
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string[,] arry = new string[rowsint-1, 2];
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for (int i = 1; i <= rowsint-1; i++)
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{
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//Item_Code列
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arry[i - 1, 0] =arryItem[i, 1].ToString();
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//Customer_Name列
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arry[i - 1, 1] = arryCus[i, 1].ToString();
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}
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Response.Write(arry[0, 0] + " / " + arry[0, 1] + "#" + arry[rowsint - 2, 0] + " / " + arry[rowsint - 2, 1]);
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}
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excel.Quit(); excel = null;
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Process[] procs = Process.GetProcessesByName("excel");
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foreach (Process pro in procs)
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{
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pro.Kill();//没有更好的方法,只有杀掉进程
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}
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GC.Collect();
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}
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)。
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先引用命名空间:using System.Text;和using System.IO;
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FileStream fs = new FileStream("d:\\Customer.csv", FileMode.Open, FileAccess.Read, FileShare.None);
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StreamReader sr = new StreamReader(fs, System.Text.Encoding.GetEncoding(936));
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string str = "";
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string s = Console.ReadLine();
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while (str != null)
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{ str = sr.ReadLine();
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string[] xu = new String[2];
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xu = str.Split(',');
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string ser = xu[0];
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string dse = xu[1]; if (ser == s)
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{ Console.WriteLine(dse);break;
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}
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} 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:
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//txt文件名
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string fn = DateTime.Now.ToString("yyyyMMddHHmmss") + "-" + "PO014" + ".txt";
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OleDbConnection con = new OleDbConnection(conStr);
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con.Open();
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string sql = "select ITEM,REQD_DATE,QTY,PUR_FLG,PO_NUM from TSD_PO014";
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/OleDbCommand mycom = new OleDbCommand("select * from TSD_PO014", mycon);
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//OleDbDataReader myreader = mycom.ExecuteReader(); //也可以用Reader读取数据
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DataSet ds = new DataSet();
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OleDbDataAdapter oda = new OleDbDataAdapter(sql, con);
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oda.Fill(ds, "PO014");
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DataTable dt = ds.Tables[0];
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FileStream fs = new FileStream(Server.MapPath("download/" + fn), FileMode.Create, FileAccess.ReadWrite);
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StreamWriter strmWriter = new StreamWriter(fs); //存入到文本文件中
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//把标题写入.txt文件中
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//for (int i = 0; i
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//{
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// strmWriter.Write(dt.Columns[i].ColumnName + " ");
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//}
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foreach (DataRow dr in dt.Rows)
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{
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string str0, str1, str2, str3;
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string str = "|"; //数据用"|"分隔开
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str0 = dr[0].ToString();
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str1 = dr[1].ToString();
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str2 = dr[2].ToString();
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str3 = dr[3].ToString();
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str4 = dr[4].ToString().Trim();
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strmWriter.Write(str0);
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strmWriter.Write(str);
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strmWriter.Write(str1);
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strmWriter.Write(str);
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strmWriter.Write(str2);
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strmWriter.Write(str);
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strmWriter.Write(str3);
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strmWriter.WriteLine(); //换行
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}
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strmWriter.Flush();
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strmWriter.Close();
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if (con.State == ConnectionState.Open)
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{
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con.Close();
}
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