从asp.net类调用MVC视图会引发异常
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（控件是从代码后面添加的）。
我在这里找到了答案的一部分。 唯一的问题是这个扩展方法是为MVC控制器类制作的。
我在ASCX.CS的电话中做了什么：
fCatEve.Controllers.ASPXTestController test = new Controllers.ASPXTestController();
string htmlView = test.RenderView("Index", null);
在这个动作中，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。
以下是我正在使用的方法（来自上面提到的页面）：
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();
}
}
例外是：
RouteData必须包含一个名为'controller'的项目，其中包含一个非空字符串值。
尝试第一个答案后，这里是异常的堆栈跟踪：
System.Web.WebPages.DisplayModeProvider.GetDisplayMode（HttpContextBase上下文）在System.Web.Mvc.VirtualPathProviderViewEngine.GetPath（ControllerContext controllerContext，String []位置，字符串[] areaLocations，字符串locationsPropertyName System.Web.HttpContextBase.get_Items（） ，System.Web.Mvc.VirtualPathProviderViewEngine.FindView（ControllerContext controllerContext，String viewName，String masterName，Boolean useCache）在System.Web.Mvc.ViewEngineCollection上的字符串名称，字符串名称，字符串控制器名称，字符串cacheKeyPrefix，布尔useCache，字符串[]＆ 。在System.Web.Mvc.ViewEngineCollection.FindView（ControllerContext controllerContext，String viewName，String masterName）上的System.Web.Mvc.ViewEngineCollection.Find（Func`2 lookup，Boolean trackSearchedPaths）上的c__DisplayClass6.b__4（IViewEngine e）在C： ProjectsG_Test - KOPIJA fCatEve03 Solution中的fCatEve.Helpers.ControllerExtensions.RenderView（控制器控制器，字符串viewName，ViewDataDictionary视图数据） fCatEve fCatEve Helpers ControllerExtensions.cs：第43行在fCatEve.Controls.KoledarReception.PutValuesToTabControlEVEBEVEN（Panel paControl，REFields REField）in C： ProjectsG_Test - KOPIJA fCatEve03 Solution fCatEve fCatEve wf Controls KoledarReception。 ascx.cs：第2747行fCatEve.Controls.KoledarReception.PutValuesToTabControl（）在C： ProjectsG_Test - KOPIJA fCatEve03 Solution fCatEve fCatEve wf Controls KoledarReception.ascx.cs中：第2710行在fCatEve.Controls.KoledarReception .Page_Load（Object sender，EventArgs e）in C： ProjectsG_Test - KOPIJA fCatEve03 Solution fCatEve fCatEve wf Controls KoledarReception.ascx.cs：System.Web.Util.CalliEventHandlerDelegateProxy.Callback（object sender ，EventArgs e）在System.Web.UI.Control.OnLoad（EventArgs e）在System.Web.UI.Control.LoadRecursive（）在System.Web.UI.Control.LoadRecursive（）在System.Web.UI.Control .LoadRecursive（）在System.Web.UI.Control.LoadRecursive（）在System.Web.UI.Control.LoadRecursive（）在System.Web.UI.Page.ProcessRequ estMain（布尔includeStagesBeforeAsyncPoint，布尔includeStagesAfterAsyncPoint）
以下是我用于生成PDF文件的单元测试之一的示例代码，不确定它是否对您有任何好处。
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
我重写了这个调用（最重要的是：稍后在MVC中使用的HttpContext.Current）：
fCatEve.Controllers.ASPXTestController test = new Controllers.ASPXTestController();
string htmlView = test.RenderView("Index", null, HttpContext.Current);
我也稍微改写了两种方法：
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();
}