troubleshooting Question

discover control events?

Avatar of Tom Knowlton
Tom KnowltonFlag for United States of America asked on
ASP.NET
5 Comments1 Solution247 ViewsLast Modified:
At runtime, is it possible to discover programmatically which events are exposed by a user control (.ascx) and subscribe to them in some generic fashion?

What I am wanting to accomplish is to read in settings from a "layout" file which tells me which .ascx controls to load into memory (and display on the form).  I can get that to work, but then I don't know how to subscribe to the events of these controls, since I am dealing with them as a collection of generic "controls" vs a collection of different control types.

So the process would be something like this:

-read in the file
-run "LoadControl" for each control name listed in the file
-subscribe to any public events the control emits
-provide some sort of central processing for the events (yet to be determined).


Is this making any sense?

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

namespace Campus_Webstore
{
    public partial class SiteManager : System.Web.UI.Page
    {
        protected void Page_PreInit(object sender, System.EventArgs e)
        {
            this.MasterPageFile = "~/contentfiles/" + Page.StyleSheetTheme + "/TCSSite.Master";
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                GlobalMethods.InitControlList();
            }

            string layout = "";

            if (Request.QueryString["layout"] != null)
            {
                layout = Request.QueryString["layout"] as string;
            }
            else
            {
                layout = "default";
            }

            DisplayLayout(layout);
        }

        private void DisplayLayout(string layout)
        {
            GlobalMethods.divlayoutgencontrols.Clear();

            StreamReader sr = new StreamReader(Server.MapPath("~/CustomLayouts/") + Page.StyleSheetTheme + "/" + layout + ".xml");
            string filecontents = sr.ReadToEnd();
            string countstr = GlobalMethods.ExtractValueFromXML(filecontents, "<count>");
            int count = Convert.ToInt32(countstr);
            string tempGUID = "";
            string settings = "";
            string[] settingsarray = new string[count];

            for (int i = 1; i <= count; i++)
            {
                settings = GlobalMethods.ExtractValueFromXML(filecontents, "<" + i.ToString() + ">");
                settingsarray = settings.Split(',');

                Control c = LoadControl("~/UserControls/" + settingsarray[0] + ".ascx");
                c.Visible = true;
                tempGUID = Guid.NewGuid().ToString();
                c.ID = settingsarray[0] + tempGUID + i.ToString();

                GlobalMethods.divlayoutgencontrols.Add(c);
            }

            foreach (Control c in GlobalMethods.divlayoutgencontrols)
            {
                sitemanagercontrolsdiv.Controls.Add(c);
            }


            Master.CalcCartTotal();
            Master.ShowCat();
            Master.DisplayUser();

        }       
    }
}



the layout file:

<count>3</count>
<1>Countries</1>
<2>AddOrEditUser</2>
<3>ShoppingCart</3>
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