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ASP.NET中的Excel操作(OLEDB方式)

一:OLEDB方式操作Excel的个人理解

        就是把要操作的Excel当作一个数据库,所有对Excel的操作,就变成了对“数据库”的操作。那么这时就需要有一个数据库的连接字符串。

    代码如下:

connStr = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + strFileName + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES\"“;

    其中的strFileName是指的Excel文件名称。

二:读取Excel文件,并将内容读到DataTable中。

            代码如下:

/// <summary>        /// 读取Excel        /// </summary>        /// <param name="strFileName">Excel文件名</param>        /// <param name="fileType"></param>        /// <param name="sheetName">Excel中的sheet的名字</param>        public static DataTable ExcelReader(string strFileName, string fileType, string sheetName)        {            string connStr = "";            DataTable _table;                connStr = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + strFileName + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES\"";            try            {                using (OleDbConnection conn = new OleDbConnection(connStr))                {                    conn.Open();                    OleDbDataAdapter myCommand = new OleDbDataAdapter(string.Format("SELECT * FROM [{0}$]", sheetName), conn);                    DataSet myDataSet = new DataSet();                    int i = myCommand.Fill(myDataSet);                    _table = myDataSet == null ? null : myDataSet.Tables.Count == 0 ? null : myDataSet.Tables[0];                }                return _table;            }            catch (Exception ex)            {                return null;            }        }

  返回的结果就是一个DataTable.
三:将DataTable保存为Excel文件

    代码如下:

 

        /// <summary>        /// 从DataTable中读取数据到excel中        /// </summary>        /// <param name="dt">传入的DataTable</param>        public static void DTToExcel(DataTable dt)        {            string fileName = ((string.IsNullOrEmpty(dt.TableName)) ? "Excel" : dt.TableName) + ".xls";            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);            HttpContext.Current.Response.Charset = "UTF-8";            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.Default;            HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";            GridView GridView1 = new GridView();            GridView1.DataSource = dt;            GridView1.DataBind();            StringWriter tw = new StringWriter();            HtmlTextWriter hw = new HtmlTextWriter(tw);            GridView1.RenderControl(hw);            HttpContext.Current.Response.Write(tw.ToString());            HttpContext.Current.Response.End();        }

 在使用DataTable导出Excel文件时,需要先创建DataTable,下面是DataTable的创建小实例:

 

            DataTable dt = new DataTable();            string[] strArr = new string[]            {                            "1",                            "2222",                            "333333333",                            "444"            };            for (int i = 0; i < strArr.Count(); i++)            {                dt.Columns.Add(strArr[i]);            }            for (int i = 0; i < strArr.Count(); i++)            {                DataRow dr2 = dt.NewRow();                dr2[0] = "总记";                dr2[1] = "11";                dr2[2] = "22";                dr2[3] = "33";                dt.Rows.Add(dr2);           }            

 

ASP.NET中的Excel操作(OLEDB方式)