如何在asp.net中回发后保留图像预览 [英] How to retain image preview even after postback in asp.net

问题描述

您好，

我已经成功实现了在实际保存图像之前显示正在上传的图像的图像预览功能，方法是阅读文章在实际上传asp.net中的图像之前显示图像预览

它就像魅力一样。但是当页面上发布回发时，预览会消失。即使在回发后还有任何解决方案来维护图像预览吗？

Hello,
I have successfully implemented the functionality of displaying image preview of the image being uploaded before actually saving the image by reading the article Show image preview before actually uploading the image in asp.net
Its works like charm. But when post back occurs on the page then the preview disappears. Is there any solution to maintain the image preview even after postback?

推荐答案

<asp:updatepanel runat="server" id="UP1" >
<content tempalte="">
<asp:fileuplaoad runat="server">
</content>
<trigger>
<asynchronouspostbacktrigger contolid="Event to submit or update buttons or as per ur need">
</asynchronouspostbacktrigger></trigger>
</asp:fileuplaoad></asp:updatepanel>

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