public class PartialViewRenderer : IPartialViewRenderer
{
    public string Render(Controller controller,string viewName,object model)
    {
        if (string.IsNullOrEmpty(viewName))
            viewName = controller.ControllerContext.RouteData.GetrequiredString("action");

        controller.ViewData.Model = model;

        using (StringWriter sw = new StringWriter())
        {
            ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(controller.ControllerContext,viewName);
            ViewContext viewContext = new ViewContext(controller.ControllerContext,viewResult.View,controller.ViewData,controller.TempData,sw);
            viewResult.View.Render(viewContext,sw);

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

当我第一次将我的应用程序转换为MVC 4时,遇到问题,它正在得到运行时异常.所以我尝试修复需要修复的内容,这使我改变了Hanselmans MockHelpers上的以下方法：(我基本上改变了HttpContext.Items,因为它被吹出了一个“null”的异常)

public static HttpContextBase FakeHttpContext()
    {
        var context = new Mock<HttpContextBase>();
        var request = new Mock<HttpRequestBase>();
        var response = new Mock<HttpResponseBase>();
        var session = new Mock<HttpSessionStateBase>();
        var server = new Mock<HttpServerUtilityBase>();
        var cookies = new HttpCookieCollection();
        var items = new ListDictionary();

        request.Setup(r => r.Cookies).Returns(cookies);
        response.Setup(r => r.Cookies).Returns(cookies);

        context.Setup(ctx => ctx.Items).Returns(items);

        context.SetupGet(ctx => ctx.Request).Returns(request.Object);
        context.SetupGet(ctx => ctx.Response).Returns(response.Object);
        context.SetupGet(ctx => ctx.Session).Returns(session.Object);
        context.SetupGet(ctx => ctx.Server).Returns(server.Object);

        return context.Object;
    }

 public static void SetFakeControllerContext(this Controller controller,RouteData route)
    {
        var httpContext = FakeHttpContext();

        ControllerContext context = new ControllerContext(new RequestContext(httpContext,route),controller);

        controller.ControllerContext = context;
    }

这里有一个非常简单的nUnit测试,我必须尝试并确定我需要做什么改变,这个模拟的http上下文(我甚至没有说出来)

[Test]
    public void test()
    {
        _contactsController = _container.Resolve<ContactsController>();

        var route = new RouteData();

        route.Values.Add("controller","ContactsController");
        route.Values.Add("action","GetEditContactDetailsDialog");

        _contactsController.SetFakeControllerContext(route);

        var result = _contactsController.GetEditContactDetailsDialog("1");
    }

现在当我运行这个测试它在PartialViewRenderer.Render调用onEngineResult viewResult = ViewEngines.Engines.FindPartialView(controller.ControllerContext,viewName);这是以下堆栈跟踪.

at System.Web.WebPages.DisplayModeProvider.<.ctor>b__2(HttpContextBase context)
at System.Web.WebPages.DefaultDisplayMode.CanHandleContext(HttpContextBase httpContext)
at System.Web.WebPages.DisplayModeProvider.<>c__DisplayClass6.b__5(IDisplayMode mode)
at System.Linq.Enumerable.WhereListIterator1.MoveNext()
at System.Collections.Generic.List1..ctor(IEnumerable1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source)
at System.Web.WebPages.DisplayModeProvider.GetAvailableDisplayModesForContext(HttpContextBase httpContext,IDisplayMode currentDisplayMode)
at System.Web.Mvc.VirtualPathProviderViewEngine.GetPath(ControllerContext controllerContext,String[] locations,String[] areaLocations,String locationsPropertyName,String name,String controllerName,String cacheKeyPrefix,Boolean useCache,String[]& searchedLocations)

看来我不能进去,嘲笑DisplayModeProvider.有没有人有解决这个问题？我没有找到任何地方的解决方案.