Add a custom property to the site node

Here is an easy way to add and retrieve a custom property to you site in the .config file.

Here is an example with my custom property SiteUID

1. Add this property to your site tag:
   

   <site patch:after="*[contains(@name, 'login')]"
       hostName="uk.xxx"
       targetHostName="uk.xxx"
       name="UK"
       siteUID="MyUniqueID"
       virtualFolder="/"
       physicalFolder="/"
       rootPath="/sitecore/content/United Kingdom/Website"
       startItem="/Homepage"
       contentStartItem="/sitecore/content/United Kingdom/Website/Homepage"
       database="web"
       domain="extranet"
       allowDebug="true"
       cacheHtml="true"
       htmlCacheSize="10MB"
       registryCacheSize="0"
       viewStateCacheSize="0"
       xslCacheSize="5MB"
       filteredItemsCacheSize="2MB"
       enablePreview="true"
       enableWebEdit="true"
       enableDebugger="true"
       disableClientData="false"
       language="en"/>

2. Create an extension method:
   

   /// <summary>
   /// Retrun the site unique ID
   /// </summary>
   /// <returns></returns>
   public static string SiteUID(this SiteContext site)
   {
       Assert.IsNotNull(site, "Site cannot be null");
               
       try 
       {         
           string uid = site.Properties["siteUID"];
           if (!String.IsNullOrEmpty(uid))
               return uid;
           else
               return site.Name;
       }
       catch (Exception)
       {
           return site.Name;
       }
   }

3. Use this property in your code: (don't forget to add you using to the class with your extention method)
   

   Sitecore.Context.Site.SiteUID()