asp.net-mvc – 如何渲染部分视图到字符串

public ActionResult SomeAction()
{
    return new JsonpResult
    {
        Data = new { Widget = "some partial html for the widget" }
    };
}

public ActionResult SomeAction()
{
    // will render HTML that I can pass to the JSONP result to return.
    var partial = RenderPartial(viewModel); 
    return new JsonpResult
    {
        Data = new { Widget = partial }
    };
}

我选择了像ASP.NET MVC 4应用程序的扩展方法如下。我认为它比我看到的一些建议更简单：

public static class ViewExtensions
{
    public static String RenderToString(this PartialViewResult partialView)
    {
        var httpContext = httpContext.Current;

        if (httpContext == null)
        {
            throw new NotSupportedException("An http context is required to render the partial view to a String");
        }

        var controllerName = httpContext.request.requestContext.RouteData.Values["controller"].ToString();

        var controller = (ControllerBasE)ControllerBuilder.Current.GetControllerFactory().CreateController(httpContext.request.requestContext,controllerName);

        var controllerContext = new ControllerContext(httpContext.request.requestContext,controller);

        var view = ViewENGInes.ENGInes.FindPartialView(controllerContext,partialView.ViewName).View;

        var sb = new StringBuilder();

        using (var sw = new StringWriter(sb))
        {
            using (var tw = new HtmlTextWriter(sw))
            {
                view.Render(new ViewContext(controllerContext,view,partialView.ViewData,partialView.TemPDAta,tw),tw);
            }
        }

        return sb.ToString();
    }
}

它允许我执行以下操作：

var html = PartialView("SomeView").RenderToString();

此外，此方法仍然保留视图的任何Model，ViewBag和其他视图数据。