从 asp.net 类调用 MVC 视图会引发异常-Java 学习之路

我想获得 MVC 视图的 HTML。正在从 ASCX.CS 班级拨打电话。 (我正在尝试将 MVC View 注入 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)。

我找到了部分答案这里。唯一的问题是这个扩展方法是针对 MVC 控制器类的。

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局部视图。

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 必须包含名为“controller”的项目，其中包含 non-empty 字符串值。

在尝试第一个答案后，这里是异常的堆栈跟踪：

at System.Web.HttpContextBase.get_Items() at System.Web.WebPages.DisplayModeProvider.GetDisplayMode(HttpContextBase context)System.Web.Mvc.VirtualPathProviderViewEngine.GetPath(ControllerContext controllerContext，String [8] locations，String [9] areaLocations，String locationsPropertyName，String name，String controllerName，String cacheKeyPrefix，Boolean useCache，String [10]＆searchingLocations)at System.Web.Mvc.VirtualPathProviderViewEngine.FindView(ControllerContext controllerContext，String viewName ，String masterName，Boolean useCache)at System.Web.Mvc.ViewEngineCollection.Find(Func.<>c__DisplayClass6.b__4(IViewEngine e)at System.Web.Mvc.ViewEngineCollection.Find(Func`2 lookup，Boolean trackSearchedPaths)at System.Web.Mvc.ViewEngineCollection.FindView(ControllerContext controllerContext，String viewName，String masterName)at fCatEve.Helpers.ControllerExtensions.RenderView(Controller controller，String viewName，ViewDataDictionary viewData)in C：\ _ ProjectsG_Test - KOPIJA\fCatEve03 \解\ fCatEve \用 C fCatEve \助手\ ControllerExtensions.cs:line 43 fCatEve.Controls.KoledarReception.PutValuesToTabControlEVEBEVEN(Panel paControl，REFields REField)：\ ProjectsG_Test - KOPIJA\fCatEve03 \解\ fCatEve\fCatEve\WF \控制\ KoledarReception.ascx.cs:line 2747 在 fCatEve.Controls.KoledarReception.PutValuesToTabControl()在 C：\ ProjectsG_Test - KOPIJA\fCatEve03 \解\ fCatEve\fCatEve\WF \控制\ KoledarReception.ascx.cs:line 2710 在 fCatEve.Controls.KoledarReception.Page_Load(Object 发件人，EventArgs e)如 C：\ ProjectsG_Test - KOPIJA\fCatEve03 \解\ fCatEve\fCatEve\WF \在 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object 发件人控制 KoledarReception.ascx.cs:line 817，EventArgs 的)在 System.Web.UI.Control.OnLoad(EventArgs e)在 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(Boolean include_StagesBeforeAsyncPoin t，Boolean includeStagesAfterAsyncPoint)

2 回答

这是我用于我的单元测试之一的示例代码，该代码应该生成 PDF 文件，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

回复于 2024-04-27T23:53:01+08:00

我重写了调用(最重要的是：HttpContext.Current，后来在 MVC 中使用)：

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

我还略微重写了两种方法：

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();
    }

回复于 2024-04-27T23:53:01+08:00

从 asp.net 类调用 MVC 视图会引发异常

2 回答

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