ASP.Net: EshineASPNet教程-EXCEL导入与导出

完整教程链接：ASP.Net: EshineASPNet-基于ASP.Net敏捷开发开源框架

Excel的导入与导出是后台最常用的功能之一了，这里分享一下实现方式。

导入

要实现excel导入，这里使用OLEDB，先引用System.Data.OleDb。

    public DataTable InputExcel(string TableName)
    {
        try
        {
            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + path  + ";" + "Extended Properties='Excel 8.0;HDR=YES;IMEX=1;'";
            OleDbConnection conn = new OleDbConnection(strConn);
            conn.Open();
            string strExcel = "select * from [" + TableName + "$]";
            OleDbDataAdapter myCommand = new OleDbDataAdapter(strExcel, strConn);
            DataTable dt = new DataTable();
            myCommand.Fill(dt);
            conn.Close();
            return dt;
        }
        catch (Exception ex)
        {
            return null;
        }
    }

上面的函数以Sheet名作为输入，支持中文，可以选择Excel里面的哪张表来导入，读取的数据保存在DataTable。然后就可以对DataTable里面的数据逐行处理并插入数据库。

导出

如果数据是存在GridView控件里面的，那么有个简便方法可以导出，先添加System.Web.UI和System.Web.UI.HtmlControls引用。

    public void gridviewtoexcel(GridView gv, string filename)
    {
        StringBuilder sb = new StringBuilder();
        StringWriter sw = new StringWriter(sb);
        HtmlTextWriter htw = new HtmlTextWriter(sw);

        Page page = new Page();
        HtmlForm form = new HtmlForm();

        for (int i = 0; i < gv.Rows.Count; i++)
        {
            if (gv.Rows[i].FindControl("GridView2") != null)
            {
                gv.Rows[i].Cells.RemoveAt(0);
                gv.Rows[i].Cells.RemoveAt(gv.Rows[i].Cells.Count - 1);
            }
        }

        gv.EnableViewState = false;

        // Deshabilitar la validación de eventos, sólo asp.net 2
        page.EnableEventValidation = false;

        // Realiza las inicializaciones de la instancia de la clase Page que requieran los diseñadores RAD.
        page.DesignerInitialize();

        page.Controls.Add(form);
        form.Controls.Add(gv);

        page.RenderControl(htw);

        System.Web.HttpContext.Current.Response.Clear();
        System.Web.HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=" + filename + ".xls");
        System.Web.HttpContext.Current.Response.Charset = "UTF-8";
        System.Web.HttpContext.Current.Response.ContentEncoding = Encoding.Default;
        System.Web.HttpContext.Current.Response.ContentType = "application/excel";

        string style = @"