if (ErrorCode == 404)
{
  return View["404.html"];
}

解决方法@H_404_8@

来自nemesv的答案是正确的,但我只想使用ViewRenderer而不是GenericFileResponse添加一个例子.

public class MyStatusHandler : IStatusCodeHandler
{
    private IViewRenderer viewRenderer;

    public MyStatusHandler(IViewRenderer viewRenderer)
    {
        this.viewRenderer = viewRenderer;
    }

    public bool HandlesStatusCode(HttpStatusCode statusCode,NancyContext context)
    {
        return statusCode == HttpStatusCode.NotFound;
    }

    public void Handle(HttpStatusCode statusCode,NancyContext context)
    {
        var response = viewRenderer.RenderView(context,"/status/404");
        response.StatusCode = statusCode;
        context.Response = response;
    }
}