Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

Solved

Image control won't show ImageURL

Posted on 2012-12-27

2 solutions

Medium Priority

530 Views

Last Modified: 2012-12-27

I've got a black image control on my webform and a dropdownlistbox which gives a list of jpg files to choose from. I step threw it and verify the correct path is being sent to Image1.ImageURL but no picture shows up. I can't find any other properties to set on the Image control. Also, why do I have to make pathx static? When it was private (or public) it got set to null when assigning it to target string.

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Collections;

public partial class _Default : System.Web.UI.Page 
{
    static string pathx;
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack)
        {
            DirectoryInfo dInfo = new DirectoryInfo(Server.MapPath("pics"));
            pathx = dInfo.FullName;
            ArrayList alFiles = new ArrayList();
           
            alFiles.AddRange(dInfo.GetFiles("*.jpg"));

            foreach (FileInfo fInfo in alFiles)
            {
                DropDownList1.Items.Add(fInfo.Name);
            }
        }
    }
   
    protected void DropDownList1_TextChanged(object sender, EventArgs e)
    {
        string x = DropDownList1.SelectedValue;
        string target = pathx;
        target += "\\";
        target += x;
        Image1.ImageUrl = target;
    }
 
}

Open in new window

Comment

Question by:zliminator

[X]

Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

Help others & share knowledge
Earn cash & points
Learn & ask questions

Join The Community

4 Comments

LVL 75

Assisted Solution

by:käµfm³d 👽

käµfm³d 👽 earned 400 total points

ID: 387258902012-12-27

Also, why do I have to make pathx static?

You don't. The only reason why I can think of that it would be "set to null when assigning it to target string" is that the SelectedValue of the DropDownList was null.

Your pathx variable is set to the full local path of the directory for "pics". This is something anyone not on your physical machine (i.e. everyone not sitting at your computer) would have access to. You need to use the "ASP path". That is "pics" by itself. You use the full local path to retrieve the files from disk; you use the "ASP path" to serve up files to your users.

Try changing line 36 to:

string target = "pics";

Open in new window

LVL 55

Accepted Solution

by:Jaime Olivares

Jaime Olivares earned 800 total points

ID: 387259582012-12-27

I think this may be a cleaner solution:

protected void DropDownList1_TextChanged(object sender, EventArgs e)
{
Image1.ImageUrl = ResolveUrl("~/pics/" +DropDownList1.SelectedValue);
}

no need for 'pathx'

Author Comment

by:zliminator

ID: 387260372012-12-27

a good article about paths

Author Closing Comment

by:zliminator

ID: 387260742012-12-27

It works but I need to study that article.

Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Why Color Matters on the Web

Article by: Lexie

Color can increase conversions, create feelings of warmth or even incite people to get behind a cause. If you want your website to really impact site visitors, then it is vital to consider the impact color has on them.

5 Most Important Things You Need to Know About DevOps

Article by: Anush

Originally, this post was published on Monitis Blog, you can check it here . It goes without saying that technology has transformed society and the very nature of how we live, work, and communicate in ways that would’ve been incomprehensible 5 ye…

How to Add a Watermark to an Image Using PHP (Part 2)

Video by: Marco

This tutorial will teach you the core code needed to finalize the addition of a watermark to your image. The viewer will use a small PHP class to learn and create a watermark.

Flexible Layouts

Video by: Mark

Learn how to create flexible layouts using relative units in CSS. New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).