服务器等待文件在Asp.net C＃中的保存完成

Question

I save image file into folder in Form_Load and used that image in client side. sometimes does not show image . but after refresh page image show. I want server wait till image saved complete.

  System.Drawing.Image barcodeImage = b.Encode(BarcodeLib.TYPE.CODE128, lstTicket[0].Barcode.ToString(), 250, 100);
   barcodeImage.Save(Server.MapPath("~/temp/") + lstTicket[0].Barcode.ToString() + ".jpg");

and Client Side

  <div id="Barcode" style="text-align: center; margin-top: 10px;">
      <img src="/temp/<%=item.Barcode + ".jpg"%>" style="width: 200px; height: 40px;" />
  </div>

Answer 1

I have the same problem and your solution is :

You can use

$(window).on("load"),function(){}

instead of

$(document).ready(function () {}

the alert box doesn't appear until after your barcode image are loaded and your problem will be solve

Answer 2

I'm amazed that the server can't write this image in time, but perhaps you should change the way it's done, rather than filling up the server hard disk with images of barcodes, write a handler that you put into the HTML as the img src eg <img src="barcode generator.ashx?id=12345" ... and when the client browser calls to that handler to get the barcode, generate it as a png (not jpg, jpg should never be used for barcodes) and send it

See something like this: Display Image using ashx Handler

Here the guy is getting his avatar image out of db based on primary key supplies in URL - your situation is less complex - you can just generate the barcode data directly (put the barcode value you want to generate into the URL in the HTML , as a parameter

If you need more code samples etc google for something like "generate image dynamically ashx"