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我们使用DEV工具

首先在该页面xxx.aspx页面里面注册DEV,写在页面最开始

<%@ Register assembly="DevExpress.Web.v16.2, Version=16.2.5.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web" tagprefix="dx" %>

然后粘贴如下代码，弹出框+显示图片功能前端代码：

<dx:ASPxPopupControl ID="popupChangeRuleImg" runat="server" AllowDragging="True" AllowResize="True" ClientInstanceName="popupChangeRule" CloseAction="CloseButton" CssClass="auto-style3" HeaderText="选择加分项" Height="384px" Modal="True" PopupAnimationType="Fade" PopupHorizontalAlign="WindowCenter" PopupVerticalAlign="WindowCenter" ShowCloseButton="False" ShowFooter="True" ShowPageScrollbarWhenModal="True" Theme="Aqua" Width="537px">
                <HeaderImage Url="~/images/edit.png">

                </HeaderImage>
                <FooterStyle>
                <Paddings Padding="5px" />
                </FooterStyle>
                <FooterTemplate>
                    <dx:ASPxMenu ID="mnuToolBar" runat="server" EnableTheming="True" ShowAsToolbar="True" Theme="Aqua">
                        <ClientSideEvents ItemClick="function(s, e) {
	e.processOnServer = false;
    var itemName = e.item.name;
	switch(itemName){
		case 'Cancel':
			popupChangeRule.Hide();
			break;
                            }
}" />
                        <Items>
                            <dx:MenuItem Name="Cancel" Text="取消">
                                <Image Url="~/images/close.gif">
                                </Image>
                            </dx:MenuItem>
                        </Items>
                    </dx:ASPxMenu>
                </FooterTemplate>
                <contentcollection>
                    <dx:PopupControlContentControl ID="PopupControlContentControl3" runat="server" SupportsDisabledAttribute="True">
                       
                        <asp:Image ID="Image1" runat="server" Height="461px" Width="520px" />
                       
                    </dx:PopupControlContentControl>
                </contentcollection>
            </dx:ASPxPopupControl>

最后在点击事件里面添加如下代码，也就是xxx.aspx.cs文件里面：

 Image1.ImageUrl = "../files/0.jpg";
 popupChangeRuleImg.ShowOnPageLoad=true;