CustomContentResolver.cs

public class CustomContentsResolver : RenderingContentsResolver
{
  private readonly HttpContextBase _httpContext;
  
  public CustomContentsResolver(HttpContextBase httpContext)
  {
    _httpContext = httpContext;
  }
  
  protected override JObject ProcessItem(Item item, Rendering rendering, IRenderingConfiguration renderingConfig)
  {
    var querystring = _httpContext.Request.QueryString;
    return base.ProcessItem(item, rendering, renderingConfig);
  }
}