a big and simple even stupid question for image URL

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Hi, friends,

I have met a strange problem: perhaps I have missed sth (I am new to web development)

I found I have met a very simple "problem": just one page to display a image and a label with a given public string.
the problem is that the label out is correct, i.e. "~/Books/Ajax/AJAX In Action.jpg",just as expected. but the image is not displayed. But problem is that if I directly give the
URL image with "~/Books/Ajax/AJAX In Action.jpg", then the image can be displayed. what is wrong here?

see below just one step:

ASP.NET

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

<!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>
        <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl='<%# Server.UrlEncode(Eval("image_url_default").ToString())%> '/>
    </div>
    <asp:Label ID="Label1" runat="server" Text="Label"> <% =image_url_default%>
    </form>
</body>
</html>

C#

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

public partial class _Default : System.Web.UI.Page 
{
    public string image_url_default="~/Books/Ajax/AJAX In Action.jpg";
}

Posted 23-Jun-12 6:15am

Seraph_summer

Updated 2-Sep-12 6:13am

Wendelius

v4

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Comments

DamithSL 23-Jun-12 13:29pm

How you set image url? can update the question with code sample?

Seraph_summer 24-Jun-12 7:10am

thanks, I have made a simple example, see the reply to pascal Ganaye.

thanks for your kind help!

Pascal Ganaye 23-Jun-12 17:19pm

your logic seems right.
You should make a simple page and if it still do it post it here.

Seraph_summer 24-Jun-12 9:37am

I have simplified it again, I found I have met a very simple "problem":

see below just one step:

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

<!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>
<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl='<%# Server.UrlEncode(Eval("image_url_default").ToString())%> '/>
</div>
<asp:Label ID="Label1" runat="server" Text="Label"> <% =image_url_default%>
</form>
</body>
</html>

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

public partial class _Default : System.Web.UI.Page
{
public string image_url_default="~/Books/Ajax/AJAX In Action.jpg";
}

the problem is:

above two places to call the same variable "image_url_default", one is for image URL and the other is direclty output into a label, the lable output is correct, i.e. "~/Books/Ajax/AJAX In Action.jpg", but the image URL is not correct. I think there there is a simple or even stupid mistake done by myself, but I do not know what:)

2 solutions

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DamithSL · Accepted Answer · 2012-06-24T05:59:00

Solution 2

try

C#

<img alt="" src="<%=Page.ResolveClientUrl(image_url_default)%>" />

or

C#

<img alt="" src="<%=VirtualPathUtility.ToAbsolute(image_url_default)%>" />

if you need to set ASP.NET control URL, do it in Page load from code behind.

Posted 24-Jun-12 5:59am

DamithSL

Updated 24-Jun-12 6:03am

v3

Comments

Seraph_summer 24-Jun-12 15:48pm

you are right, your proposal works for html img. this is also one solution.
thanks!

Seraph_summer · Accepted Answer · 2012-06-24T04:16:00

OK, friends, by searching website again and again, I have found finally the solution,by doing different way, this problem can be solved. but still, I do not understand why original problem occurs or why original way does not work.
I appriciated it very much If any expert can give us some hints.

C#

protected void Page_Load(object sender, EventArgs e)
    {
        this.ImageButton1.ImageUrl = image_url_default;
    }