从类库呈现ViewUserControl

但是我更喜欢在类库中有一个ViewUserControl或者仅仅一个ViewPage,这样可以进行渲染。我希望能够使用ViewUserControl和渲染方法 从一个ASP.NETMVC应用程序,例如Windows服务。

如何从类库渲染视图?

我尝试了这个,但是对RenderPartial的调用抛出了一个NullReferenceException。

[TestMethod]
public void RenderViewToString()
{
string viewName = "EmailTest";
string viewData = "martin";

//Create memory writer 
var sb = new StringBuilder();
var memWriter = new StringWriter(sb);

//Create fake http context to render the view 
var fakeResponse = new HttpResponse(memWriter);
var fakeContext = new HttpContext(new HttpRequest("fake.html", "http://localhost/fake.html", ""), fakeResponse);
var fakeRouteData = new RouteData();
fakeRouteData.Values.Add("Controller", "Fake");
var fakeControllerContext = new ControllerContext(new HttpContextWrapper(fakeContext), fakeRouteData, new FakeController());

HttpContext.Current = fakeContext;

//Use HtmlHelper to render partial view to fake context 
var html = new HtmlHelper(new ViewContext(fakeControllerContext, new FakeView(), new ViewDataDictionary(), new TempDataDictionary(), memWriter), new ViewPage());

html.RenderPartial(viewName, viewData);

//Flush memory and return output 
memWriter.Flush();

var htmlString = sb.ToString();