ASP.NET MVC使用视图进行渲染,而不创建控制器操作

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protected string RenderPartialViewToString(string viewName, object model) {
    if (string.IsNullOrEmpty(viewName))
        viewName = ControllerContext.RouteData.GetRequiredString("action");
    ViewData.Model = model;
    using (StringWriter sw = new StringWriter()) {
        ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
        ViewContext viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData, TempData, sw);
        viewResult.View.Render(viewContext, sw);

        return sw.GetStringBuilder().ToString();
    }
}

    /// <summary>
    /// Generates a string based on the given PartialViewResult.
    /// </summary>
    /// <param name="partialViewResult"></param>
    /// <returns></returns>
    protected internal string RenderPartialViewToString(ViewResultBase partialViewResult)
    {
        Require.ThatArgument(partialViewResult != null);
        var context = ControllerContext;
        Require.That(context != null);
        using (var sw = new StringWriter())
        {
            if (string.IsNullOrEmpty(partialViewResult.ViewName))
            {
                partialViewResult.ViewName = context.RouteData.GetRequiredString("action");
            }
            ViewEngineResult result;
            if (partialViewResult.View == null)
            {
                result = partialViewResult.ViewEngineCollection.FindPartialView(context, partialViewResult.ViewName);
                Require.That(result.View != null,
                             () => new InvalidOperationException(
                                       "Unable to find view. Searched in: " +
                                       string.Join(",", result.SearchedLocations)));
                partialViewResult.View = result.View;
            }

            var view = partialViewResult.View;
            var viewContext = new ViewContext(context, view, partialViewResult.ViewData,
                                              partialViewResult.TempData, sw);
            view.Render(viewContext, sw);
            return sw.ToString();
        }
    }

public ActionResult MyAction(...) 
{
    var myModel = GetMyModel(...);
    string viewString = RenderPartialViewToString(PartialView("MyView", myModel));
    // do something with the string
    return someAction;
}