如果找不到pdf，如何显示错误消息。还可以找到日期差异。 [英] How to display error msg if pdf are not found. Also find date diffrence.

问题描述

选择drodownlist（网站名称），



如果网站数据可用则显示pdf，

如果没有则显示错误找不到pdf。



我尝试过：

selection of drodownlist (site name ),

if site data are availabe then display pdf ,
if not then show error "pdf is not found".

What I have tried:

protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
   {

           DataTable dt2 = new DataTable();
           dt2 = dc.datacall("select * from vehicleequipmentreading  where ReadingSite ='" + drpsite.SelectedItem.Text.Trim() + "'order by ReadingId asc");
           // dt2 = dc.datacall("select * from vehicleequipmentreading  where ReadingDate BETWEEN  '" + txtdate.Text.Trim() + "'  AND   '" + txtenddate.Text.Trim() + "'  order by ReadingId asc");
          dt2 = dc.datacall("select * from vehicleequipmentreading  where ReadingDate ='" + txtdate.Text.Trim() + "' order by ReadingId desc");


               GridView GridView1 = new GridView();
               GridView1.AllowPaging = false;
               GridView1.DataSource = dt2;
               GridView1.DataBind();

               Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
               StringWriter sw = new StringWriter();
               HtmlTextWriter hw = new HtmlTextWriter(sw);

               GridView1.RenderControl(hw);


               StringReader sr = new StringReader(sw.ToString());

             //  HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
               iTextSharp.text.html.simpleparser.HTMLWorker worker = new iTextSharp.text.html.simpleparser.HTMLWorker(pdfDoc);


               PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
               pdfDoc.SetPageSize(iTextSharp.text.PageSize.A4.Rotate());

               Response.ContentType = "application/pdf";
               Response.AddHeader("content-disposition", "attachment;" +

                                              "filename=dailyreadingreport.pdf");

               Response.Cache.SetCacheability(HttpCacheability.NoCache);
               pdfDoc.Open();

               worker.Parse(sr);
               pdfDoc.Close();

               Response.Write(pdfDoc);
               Response.End();

   }

推荐答案

是.. !!我做到了：



调用gridview。生成pdf ..

yes ..!! i did it :

call gridview. and generate pdf ..

if (dt8.Rows.Count > 0)
       {
           GridView GridView2 = new GridView();
           GridView2.AllowPaging = false;
           GridView2.DataSource = dt8;
           GridView2.DataBind();


           Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
           StringWriter sw = new StringWriter();
           HtmlTextWriter hw = new HtmlTextWriter(sw);

           GridView2.RenderControl(hw);

           StringReader sr = new StringReader(sw.ToString());

           HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

           PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
           pdfDoc.SetPageSize(iTextSharp.text.PageSize.A4.Rotate());

           Response.ContentType = "application/pdf";
           Response.AddHeader("content-disposition", "attachment;" +

                                          "filename=JobcardDate_vehicleType.pdf");

           Response.Cache.SetCacheability(HttpCacheability.NoCache);
           pdfDoc.Open();

           htmlparser.Parse(sr);
           pdfDoc.Close();
           Response.Write(pdfDoc);

           Response.End();
       }
}

else
      {
          Response.Write("<script> alert('Reports Not Found')</script>");
      }

和日期差异使用BETWEEN。



喜欢，数据BETWEEN和

and for date difference use BETWEEN .

like , data BETWEEN "" AND""

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