Fixed issue where query string parameters were not being URL encoded correctly, causing problems if a dictionary value contains a = or & symbol

src/Umbraco.Core/DictionaryExtensions.cs

@@ -5,6 +5,7 @@ using System.Collections.Specialized;
 using System.Linq;
 using System.Text;
 using System.Web.Mvc;
+using System.Web;
 
 namespace Umbraco.Core
 {
@@ -158,7 +159,7 @@ namespace Umbraco.Core
 			var builder = new StringBuilder();
 			foreach (var i in d)
 			{
-				builder.Append(String.Format("{0}={1}&", i.Key, i.Value));
+				builder.Append(String.Format("{0}={1}&", HttpUtility.UrlEncode(i.Key), i.Value == null ? string.Empty : HttpUtility.UrlEncode(i.Value.ToString())));
 			}
 			return builder.ToString().TrimEnd('&');
 		}