（转）.net中导入excel文件显示进度条

在ASP.NET中经常会遇到Excel文件导入数据库的问题，遇到数据量比较大的时候，最好显示进度条。

进度条设计是参考网上某牛人提供的代码，利用JS实现的，谢谢这个大牛了（忘记了当时记录下他的大名了，:(）。具体思路：首先将后台服务器上 ProgressBar.htm 页面内容（其中有html和js代码）完全读取出来，并write到前台。然后在数据导入前，添加js调用，如下：

 jsBlock = "";

 Response.Write(jsBlock);
 Response.Flush();

其次，在处理每条数据导入的过程中，添加如下js调用：

 System.Threading.Thread.Sleep(20);

 float cposf = 0;
 cposf = 100 * i / maxrows;
 int cpos = (int)cposf;

 jsBlock = "";
 Response.Write(jsBlock);
 Response.Flush();

*******************************************************

以下是完整的实现过程......

前台.aspx部分代码：

       父分类
       
       
       
                                                            Visible="False">


        Excel文件
      
      
                                                            Visible="False">

... ... ...

 

以下是在FileUpload控件中，选择了相应文件后点击“导入”.aspx.cs文件中响应事件。

protected void btnImport_Click(object sender, EventArgs e)
    {
        string cparentname = this.tbParent.Text.Trim();
        string cparentid = this.tbParentId.Text.Trim();
        if (cparentname == "")
        {
            Label1.Visible = true;
            return;
        }
        else
        {
            Label1.Visible = false;
        }

        string cfilename = this.fuGlossaryXls.FileName;
        if (cfilename == "")
        {
            Label2.Visible = true;
            return;
        }
        else
        {
            Label2.Visible = false;
        }

        //////////////首先将文件上传到服务器///////////////////////////////////////////////////////////  
        string tempfilename = Guid.NewGuid().ToString();
        String filepath = System.Configuration.ConfigurationSettings.AppSettings["SaveFilePath"] + tempfilename + ".xls";
        try
        {
            fuGlossaryXls.SaveAs(filepath);
        }
        catch (Exception ex)
        {
            //Response.Write("");
            Response.Write(ex.Message);
            return;
        }
        //////////////文件上传到服务器////////////////////////////////////////////////////////////

        //////////////显示进度/////////////////////////////////////////////////////////////////////////////
        DateTime startTime = System.DateTime.Now;
        DateTime endTime = System.DateTime.Now;

        // 根据 ProgressBar.htm 显示进度条界面
        string templateFileName = Path.Combine(Server.MapPath("."), "ProgressBar.htm");
        StreamReader reader = new StreamReader(@templateFileName, System.Text.Encoding.GetEncoding("gb2312"));
        string html = reader.ReadToEnd();
        reader.Close();
        Response.Write(html);
        Response.Flush();
        System.Threading.Thread.Sleep(1000);

        string jsBlock;
        // 处理完成
        jsBlock = "";
        Response.Write(jsBlock);
        Response.Flush();

        ///--------------------------------------------------
        object missing = Missing.Value;
        DateTime beforeTime;
        DateTime afterTime;

        beforeTime = DateTime.Now;
        Excel.Application cexcelapp = new Excel.Application();
        cexcelapp.Visible = false;
        afterTime = DateTime.Now;

        Excel.Workbook workBook = cexcelapp.Workbooks.Open(filepath, missing, missing, missing, missing, missing,
                                missing, missing, missing, missing, missing, missing, missing, missing, missing);

        //得到WorkSheet对象
        Excel.Worksheet sheet = (Excel.Worksheet)workBook.Worksheets.get_Item(1);

        int maxrows = 0;
        int maxcolumns = 0;
        maxrows = sheet.UsedRange.Rows.Count;
        maxcolumns = sheet.UsedRange.Columns.Count;
        ///--------------------------------------------------

        System.Threading.Thread.Sleep(200);

        bool err = false;

        // 根据处理任务处理情况更新进度条
        for (int i = 1; i <= maxrows; i++)
        {
            ///-------------处理-------------------------------------
            Range curentCell = (Range)sheet.Cells[i, 1];
            string cvalue = curentCell.Text.ToString().Trim();
            if (cvalue != "")
            {
                //bool exist = CommFun.DataItemExistCheck("GLOSSARY", "NODE_NAME", cvalue);
                string cwherestr = " parent_id = '" + cparentid + "'";
                bool exist = CommFun.DataItemExistCheck("GLOSSARY", "NODE_NAME", cvalue, cwherestr);
                if (!exist)
                {
                    string newnodeid = Glossary.GetNewnodeId(cparentid);
                    int subresult = Glossary.AddNode(newnodeid, cvalue, cparentid);
                    if (subresult != 0)
                    {
                        jsBlock = "";