updatepanel中的图像导致整页刷新

Question

我在更新面板内有一个图像控件,在页面加载我正在设置它的URL.

page_load中的代码

string url = "example.com";
Image1.ImageUrl = url;

在aspx中的updatepanel内部

<asp:Image ID="Image1" runat="server" CssClass="image" />

我还在更新面板内有几个提交按钮,我正在按钮点击更新一些texbox和标签.

但是这会导致整个页面刷新.(滚动条上升.)

如果将图像移到更新面板之外,则不会发生这种情况.问题是如果我删除updatepanel之外的图像,布局根本不起作用.谁能帮我这个？谢谢.

UPDATE

我意识到这只发生在Chrome中.有没有人有想法？

更新2 在该页面上,我通过从updatepanel中删除img解决了该问题.让布局工作真是太棒了,但它确实奏效了.

但是我有另一个页面,当用户点击加载更多时,我在updatepanel中添加新的imgs.同样的交易,显然我这次不能将图像移出更新面板.这是代码.

  <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>

        <!--Recent Uploads-->
        <div class="uploads">
            <h2>Uploads</h2>
            <asp:UpdatePanel ID="RecentUpload" runat="server" UpdateMode="Conditional">
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="loaduploads"/>
                </Triggers>
                <ContentTemplate>
                    <asp:Button CssClass="uploadButton" ID="loaduploads" runat="server" Text="Load More" OnClick="loaduploads_Click" />
                </ContentTemplate>
            </asp:UpdatePanel>
        </div>

代码隐藏(上传索引是会话变量)

upload_index += 5;
        for (int i = 0; i < upload_index; i++)
        {
            try
            {
                SSImage img = images[i];
                HyperLink imglink = new HyperLink();
                imglink.NavigateUrl = "/Image.aspx?id=" + img.id;
                imglink.ImageUrl = "/ShowImage.ashx?imgid=" + img.id;
                imglink.ToolTip = img.title;
                imglink.CssClass = "imgupload";
                Control contentpanel = RecentUpload.ContentTemplateContainer;
                contentpanel.Controls.AddAt(contentpanel.Controls.Count - 2, imglink);
            }
            catch (ArgumentOutOfRangeException)
            {
                loaduploads.Visible = false;
                break;
            }
        }

更新3

静态图像不会发生问题,而是在我尝试加载时发生showimage.ashx.这是代码.

<%@ WebHandler Language="C#" Class="ShowImage" %>

using System;
using System.Web;
using System.IO;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public class ShowImage : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        SqlDataReader rdr = null;
        SqlConnection conn = new SqlConnection();
        SqlCommand cmd = new SqlCommand();

        try
        {
            string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
            conn = new SqlConnection(connStr);

            cmd = new SqlCommand("SELECT Image_data FROM [Image_table] WHERE Image_id = " + context.Request.QueryString["imgID"], conn);
            conn.Open();
            Object result = cmd.ExecuteScalar();
            //if nothing found throw exception
            if (result == null)
            {
                throw new Exception();
            }
            rdr = cmd.ExecuteReader();
            while (rdr.Read())
            {
                context.Response.ContentType = "image/jpg";
                context.Response.BinaryWrite((byte[])rdr["Image_data"]);
            }

            if (rdr != null)
                rdr.Close();
        }
        catch
        {

        }
        finally
        {
            conn.Close();
            conn.Dispose();
        }

    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}

Answer 1

您应该使用更新面板的异步回发触发器，这里是示例：

<asp:AsyncPostBackTrigger ControlID="" EventName=""/>

其中“controlID”是可以导致回发的元素的 ID，“eventname”是由定义的控件触发以导致回发的特定事件