dynamic LinkButton OnClick event not working on ASP.Net

问题

I want to create dynamic LinkButton for image, <img> tag is not working dynamically so I am using LinkButton with image.
I don't want to provide ID to LinkButton because I want to generate more LinkButton dynamically. I am using following code in Default.aspx

    <%@ Page Language="C#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
        <script runat="server">   
            protected void Page_Load(object sender, EventArgs e)
            {
                Response.Write(@"<asp:LinkButton runat=""server"" OnClick=""btn_click""><img src=""close-icon (1).png"" /></asp:LinkButton>");
            }

            public void btn_click(object sender, EventArgs e)
            {
                Response.Write("HELLO");
            }   
        </script>
    </head>
<body>
    <form id="form1" runat="server">
    <div>

    </div>
    </form>
</body>
</html>

I also tried to write tag code in Default.aspx.cs file but not work.
It's showing me following error.

Error 1 'ASP.default_aspx' does not contain a definition for 'img_Click' and no extension method 'img_Click' accepting a first argument of type 'ASP.default_aspx' could be found (are you missing a using directive or an assembly reference?)

Please help me to solve this problem.

回答1:

I found my answer,answer is below

Default.aspx.cs Page

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class dynamicimage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string str = @"<asp:ImageButton ID=""dynoimage"" ImageUrl=""~/images/about01.jpg"" runat=""server"" oncommand=""clickme"" commandname=""btn"" />";
        Control c = ParseControl(str);
        form1.Controls.Add(c);
        ((ImageButton)Page.FindControl("dynoimage")).Command += new CommandEventHandler(clickme);
    }

    protected void clickme(object sender,CommandEventArgs e)
    {
        Response.Write("Image clicked");
        Label1.Text = "Image clicked";
    }
}

and here is the Default.aspx Page

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="dynamicimage.aspx.cs" Inherits="dynamicimage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    </div>
    <p>
        <asp:Label ID="Label1" runat="server" Text="before click"></asp:Label>
    </p>
    </form>
</body>
</html>

回答2:

You have got the approach wrong, your first Response.Write("...") not the Response.Write("

Read this aritcle to use controls in ASP.NET dynamically.

http://msdn.microsoft.com/en-us/library/kyt0fzt1%28v=vs.100%29.aspx

来源：https://stackoverflow.com/questions/13106715/dynamic-linkbutton-onclick-event-not-working-on-asp-net

标签

ASP.NET

asplinkbutton