Sitecore custom link provider example

CustomLinkProvider.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Sitecore.Data.Items;
using Sitecore.Links;

namespace Sitemap.Custom
{
    public class CustomLinkProvider : LinkProvider
    {
        public override string GetItemUrl(Item item, UrlOptions options)
        {
            var url = base.GetItemUrl(item, options);
            
            //Example customisation which lowercases all URLs
            if (!string.IsNullOrEmpty(url))
                return url.ToLower();

            return url;
        }
    }
}

zzz.SitecoreInclude.CustomLinkProvider.config

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <linkManager>
      <providers>
        <add name="sitecore">
          <patch:attribute name="type">Sitemap.Custom.CustomLinkProvider,Sitemap.Custom</patch:attribute>
        </add>
      </providers>
    </linkManager>
  </sitecore>
</configuration>