Pulling in a dynamic image in a control based on a url using C# and ASP.net

Answer 1

This is kind of a horrible question. I mean, .NET has an image control where you can set the source to anything you want. I'm not sure what you're wanting to be discussed.

Answer 2

Check out the new DynamicImage control released in CodePlex by the ASP.NET team.

Answer 3

I'm assuming you want to generate an image dynamicly based upon an url.

What I typically do is a create a very lightweight HTTPHandler to serve the images:

using System;
using System.Web;

namespace Example
{  
    public class GetImage : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            if (context.Request.QueryString("id") != null)
            {
                // Code that uses System.Drawing to construct the image
                // ...
                context.Response.ContentType = "image/pjpeg";
                context.Response.BinaryWrite(Image);
                context.Response.End();
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

You can reference this directly in your img tag:

<img src="GetImage.ashx?id=111"/>

Or, you could even create a server control that does it for you:

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Example.WebControl
{

    [ToolboxData("<{0}:DynamicImageCreator runat=server></{0}:DynamicImageCreator>")]
    public class DynamicImageCreator : Control
    {

        public int Id
        {
            get
            {
                if (ViewState["Id" + this.ID] == null)
                    return 0;
                else
                    return ViewState["Id"];
            }
            set
            {
                ViewState["Id" + this.ID] = value;
            }
        }

        protected override void RenderContents(HtmlTextWriter output)
        {
            output.Write("<img src='getImage.ashx?id=" + this.Id + "'/>");
            base.RenderContents(output);
        }
    }
}

This could be used like

<cc:DDynamicImageCreator id="db1" Id="123" runat="server/>

Answer 4

Yeah I noticed my issue. thanks for the help. one of those Doh!