从asp.net类调用MVC视图抛出异常

Question

我想获得MVC视图的HTML。正在从ASCX.CS类呼叫。 （我试图注入MVC​​视图到ASPX页面）。 我的ASPX页面是动态创建的（控件是从后面的代码中添加的）。

我找到答案的一部分here。唯一的问题是这个扩展方法是为MVC控制器类制作的。

我在我的电话做从ASCX.CS：

fCatEve.Controllers.ASPXTestController test = new Controllers.ASPXTestController(); 
     string htmlView = test.RenderView("Index", null); 

在这次行动我唯一的问题是ControllerContext。我不知道如何设置这个类，所以它会找到我正在寻找的部分视图。

下面是我使用的方法（从上面提到的页面）：

public static class ControllerExtensions 
{ 
    public static string RenderView(this Controller controller, string viewName, object model) 
    { 
     return RenderView(controller, viewName, new ViewDataDictionary(model)); 
    } 

    public static string RenderView(this Controller controller, string viewName, ViewDataDictionary viewData) 
    { 
     RouteData routeData = new RouteData(); 
    routeData.Values.Add("controller", controller); 
    var controllerContext = new ControllerContext { Controller = controller, RouteData = routeData }; 

    var viewResult = ViewEngines.Engines.FindView(controllerContext, viewName, null); 

     StringWriter stringWriter; 

     using (stringWriter = new StringWriter()) 
     { 
      var viewContext = new ViewContext(
       controllerContext, 
       viewResult.View, 
       viewData, 
       controllerContext.Controller.TempData, 
       stringWriter); 

      viewResult.View.Render(viewContext, stringWriter); 
      viewResult.ViewEngine.ReleaseView(controllerContext, viewResult.View); 
     } 

     return stringWriter.ToString(); 
    } 
} 

唯一的例外是：

的的RouteData必须包含一个名为“控制器”项目与非空 字符串值。

首先尝试回答后，这里是堆栈异常的痕迹：

在System.Web.HttpContextBase.get_Items（）在 System.Web.WebPages.DisplayModeProvider.GetDisplayMode（HttpContextBase 上下文） at System.Web.Mvc.VirtualPathProviderViewEngine.GetPath（ControllerContext controllerContext，String [] locations，String [] areaLocations，String locationsPropertyName，String name，String controllerName，String cacheKeyPrefix，Boolean useCache，String [] &个searchedLocations）在 System.Web.Mvc.VirtualPathProviderViewEngine.FindView（ControllerContext controllerContext，字符串的viewName，字符串masterName，布尔 useCache将）在 System.Web.Mvc.ViewEngineCollection。 <> c__DisplayClass6.b__4（IViewEngine e）上System.Web.Mvc.ViewEngineCollection.Find（Func`2查找， 布尔trackSearchedPaths）在 System.Web.Mvc.ViewEngineCollection.FindView（ControllerContext controllerContext，字符串的viewName，字符串masterName）在 fCatEve.Helpers.ControllerExtensions.RenderView（控制器的控制器， 字符串的viewName，可视数据的ViewDataDictionary）在C：\ ProjectsG_Test - KOPIJA \ fCatEve03 \解\ fCatEve \ fCatEve \助手\ ControllerExtensions.cs：线 43在 fCatEve.Controls.KoledarReception.PutValuesToTabControlEVEBEVEN（Panel paControl，REFields REField）in C：\ ProjectsG_Test - KOPIJA \ fCatEve03 \ Solution \ fCatEve \ fCatEve \ WF \控制\ KoledarReception.ascx.cs：线 2747在fCatEve.Controls.KoledarReception.PutValuesToTabControl（） 在C：\ ProjectsG_Test - KOPIJA \ fCatEve03 \解\ fCatEve \ fCatEve \ WF \控制\ KoledarReception .ascx.cs：行 2710 at fCatEve.Controls.KoledarReception.Page_Load（Object sender， EventArgs e）in C：\ ProjectsG_Test - KOPIJA \ fCatEve03 \ Solution \ fCatEve \ fCatEve \ wf \ Controls \ KoledarReception.ascx.cs ：行 817在 System.Web.Util.CalliEventHandlerDelegateProxy。回调（Object sender， EventArgs e）at System.Web.UI.Control.OnLoad（EventArgs e）at System.Web.UI.Control.LoadRecursive（）at System.Web.UI.Control.LoadRecursive（）at System.Web.UI.Control.LoadRecursive（）at System.Web.UI.Control.LoadRecursive（）at System.Web.UI.Control.LoadRecursive（）at System.Web.UI.Page.ProcessRequestMain（）布尔 includeStagesBeforeAsyncPoint，布尔includeStagesAfterAsyncPoint）

Answer 1

我改写了电话（最重要的：HttpContext.Current，这就是后来在MVC使用）：

fCatEve.Controllers.ASPXTestController test = new Controllers.ASPXTestController(); 
     string htmlView = test.RenderView("Index", null, HttpContext.Current); 

我也略有改写了两种方法：

public static string RenderView(this Controller controller, string viewName, object model, HttpContext currentContext) 
    { 
     return RenderView(controller, viewName, new ViewDataDictionary(model), currentContext); 
    } 


    public static string RenderView(this Controller controller, string viewName, ViewDataDictionary viewData, HttpContext currentContext) 
    { 
     var routeData = new RouteData(); 
     routeData.Values.Add("Controller", "ASPXTest"); //must match your Controller name 
     routeData.Values.Add("Action", "Test"); //must match your Action name 

     HttpContextWrapper wrapper = new HttpContextWrapper(currentContext); 
     controller.ControllerContext = new ControllerContext(wrapper, routeData, controller); 
     var viewResult = ViewEngines.Engines.FindView(controller.ControllerContext, viewName, null); 

     StringWriter stringWriter; 
     viewData = new ViewDataDictionary(); 


     using (stringWriter = new StringWriter()) 
     { 
     var viewContext = new ViewContext(
      controller.ControllerContext, 
      viewResult.View, 
      viewData, 
      controller.ControllerContext.Controller.TempData, 
      stringWriter); 

     viewResult.View.Render(viewContext, stringWriter); 
     viewResult.ViewEngine.ReleaseView(controller.ControllerContext, viewResult.View); 
     } 

     return stringWriter.ToString(); 
    } 

Answer 2

这里是我使用的是应该生成PDF文件，不知道它有什么好处给你我的单元测试的一个示例代码。

var controller = new MyAwesomePdfController(); 

var httpRequest = new HttpRequest("", "http://mySomething", ""); 
var stringWriter = new StringWriter(); 
var httpResponse = new HttpResponse(stringWriter); 
var routeData = new RouteData(); 
routeData.Values.Add("Controller", "MyAwesomePdf"); //must match your Controller name 
routeData.Values.Add("Action", "Receipt"); //must match your Action name 

var httpContextMock = new HttpContext(httpRequest, httpResponse) 
{ 
    //this is probably irrelevant to you, can set user principal here 
    //User = new GenericPrincipal(
    // new GenericIdentity(username), 
    // userRoles //new string[0] 
    //) 
}; 

controller.ControllerContext = new ControllerContext(new HttpContextWrapper(httpContextMock), routeData, controller); 

var receiptId = 1234; 
var pdfResult = await controller.Receipt(receiptId) as ViewAsPdf; //should return a pdf file