Tridion Extended Component Link Control Example

ComponentLinks.cs

using System;
using System.ComponentModel;
using Tridion.ContentDelivery.Web.Utilities;

namespace Tridion.Extensions.ContentDelivery.Web.UI
{
    /// <summary>
    /// Custom ComponentLink class, to replace the Tridion.ContentDelivery.Web.UI.ComponentLink 
    /// class with an added property to set query string parameters
    /// </summary>
    public class ComponentLink : Tridion.ContentDelivery.Web.UI.ComponentLink
    {
        // New Properties
        [Category("Appearance"), Bindable(true), DefaultValue("")]
        public string Parameters { get; set; }

        protected override void Render(System.Web.UI.HtmlTextWriter writer)
        {
            using (Tridion.ContentDelivery.Web.Linking.ComponentLink compLink = 
                new Tridion.ContentDelivery.Web.Linking.ComponentLink(new TcmUri(ComponentUri).PublicationId))
            {
                Tridion.ContentDelivery.Web.Linking.Link link = 
                    compLink.GetLink(PageUri, ComponentUri, TemplateUri, LinkAttributes, "", TextOnFail, AddAnchor);

                link.Parameters = Parameters;
                if (!link.IsResolved)
                {
                    if (TextOnFail)
                    {
                        writer.Write(LinkText);
                        this.RenderChildren(writer);
                    }
                }
                else
                {
                    string linkString = link.ToString();
                    int index = linkString.IndexOf("</a>");
                    if (index > 0)
                    {
                        linkString = linkString.Substring(0, index);
                    }
                    writer.Write(linkString);
                    writer.Write(LinkText);
                    this.RenderChildren(writer);
                    writer.Write("</a>");
                }
            }
        }
    }
}