Blog - When Personalisation Breaks Rendering Parameters - Code

ResetParametersOnSubstitutedRenderings.config

<?xml version="1.0"?>
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/" xmlns:set="http://www.sitecore.net/xmlconfig/set/">
  <sitecore>
    <pipelines>
      <mvc.customizeRendering>
        <processor type="Sitecore.Mvc.Analytics.Pipelines.Response.CustomizeRendering.Personalize, Sitecore.Mvc.Analytics"
                   set:type="MyNamespace.ResetParametersOnSubstitutedRenderings, MyAssembly" />
      </mvc.customizeRendering>
    </pipelines>
  </sitecore>
</configuration>

ResetParametersOnSubstitutedRenderings.cs

public class ResetParametersOnSubstitutedRenderings : Personalize
{
    protected override void ApplyChanges(Rendering rendering, RenderingReference reference)
    {
        // If the rendering being applied is different from the original renderings
        if (!rendering.RenderingItem.ID.Equals(reference.RenderingItem.ID))
        {
            // Fetch the default rendering parameters for the new rendering
            rendering.Parameters = new RenderingParameters(reference.RenderingItem.Parameters);
        }

        // Continue to apply the built-in changes
        base.ApplyChanges(rendering, reference);
    }
}