RenderAction.cshtml

@{
    var data = new RouteValueDictionary(ViewData);
    object action;
    ViewData.ModelMetadata.AdditionalValues.TryGetValue("action", out action);
    object controller;
    ViewData.ModelMetadata.AdditionalValues.TryGetValue("controller", out controller);
    object area;
    ViewData.ModelMetadata.AdditionalValues.TryGetValue("area", out area);
    if (!string.IsNullOrEmpty((string) area))
    {
        data["area"] = area;
    }
    if (!string.IsNullOrEmpty((string) controller))
    {
        Html.RenderAction((string) action, (string) controller, data);
    }
    else
    {
        Html.RenderAction((string)action, data);
    }
}

RenderActionAttribute.cs

public class RenderActionAttribute : Attribute, IMetadataAware
{
    public RenderActionAttribute([AspMvcAction] string action)
    {
        Action = action;
    }

    public RenderActionAttribute([AspMvcAction] string action, [AspMvcController] string controller)
    {
        Action = action;
        Controller = controller;
    }

    public RenderActionAttribute([AspMvcAction] string action, [AspMvcController] string controller, [AspMvcController] string area)
    {
        Action = action;
        Controller = controller;
        Area = area;
    }

    public string Action { get; set; }
    public string Controller { get; set; }
    public string Area { get; set; }

    public void OnMetadataCreated(ModelMetadata metadata)
    {
        if (!string.IsNullOrWhiteSpace(Action))
            metadata.AdditionalValues["action"] = Action;
        if (!string.IsNullOrWhiteSpace(Controller))
            metadata.AdditionalValues["controller"] = Controller;
        if (!string.IsNullOrWhiteSpace(Area))
            metadata.AdditionalValues["area"] = Area;
        metadata.TemplateHint = "RenderAction";
    }
}