Embedded UserControls: Revisited

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

namespace ControlLibrary
{
    [ToolboxData("<{0}:EmbeddedUserControlLoader runat=server></{0}:EmbeddedUserControlLoader>")]
    public class EmbeddedUserControlLoader : WebControl
    {
        # region VirtualPathProvider setup code
        static EmbeddedUserControlLoader()
        {
            if (!IsDesignMode)
            {
                System.Web.Hosting.HostingEnvironment.RegisterVirtualPathProvider(
new AssemblyResourceProvider(ResourcePrefix));
            }
        }

        static bool IsDesignMode
        {
            get
            {
                return HttpContext.Current == null;
            }
        }

        static string mResourcePrefix = "EmbeddedWebResource";

        public static string ResourcePrefix
        {
            get
            {
                return mResourcePrefix;
            }

            set
            {
                mResourcePrefix = value;
            }
        }
        #endregion


        #region Toolbox properties
        private string mAssemblyName = "";

        [Bindable(true)]
        [Category("Behavior")]
        [Localizable(true)]
        public string AssemblyName
        {
            get { return mAssemblyName; }
            set { mAssemblyName = value; }
        }


        private string mControlNamespace = "";

        [Bindable(true)]
        [Category("Behavior")]
        [Localizable(true)]
        public string ControlNamespace
        {
            get { return mControlNamespace; }
            set { mControlNamespace = value; }
        }


        private string mControlClassName = "";

        [Bindable(true)]
        [Category("Behavior")]
        [Localizable(true)]
        public string ControlClassName
        {
            get { return mControlClassName; }
            set { mControlClassName = value; }
        }
        #endregion


        #region Private members

        string Path
        {
            get
            {
                return String.Format("/{0}/{1}.dll/{2}.{3}.ascx", ResourcePrefix, AssemblyName, ControlNamespace, ControlClassName);
            }
        }

        Control c;

        protected override void OnInit(EventArgs e)
        {
            c = Page.LoadControl(Path);
            Controls.Add(c);
            base.OnInit(e);
        }
        

        protected override void RenderContents(HtmlTextWriter output)
        {
            if (IsDesignMode)
            {
                output.Write(Path);
                return;
            }
            base.RenderContents(output);
        }
        #endregion

        #region Helper members to access UserControl properties

        public void SetControlProperty(string propName, object value)
        {
            c.GetType().GetProperty(propName).SetValue(c, value, null);
        }

        public object GetControlProperty(string propName)
        {
            return c.GetType().GetProperty(propName).GetValue(c, null);
        }
        #endregion
    }
}