傳遞到字典的模型項的類型爲「</p> <p>System.Collections.Generic.List錯誤

Question

我試圖運行我的應用程序時出現以下錯誤’ System.Collections.Generic.List 1[MvcApplication2.Models.Blog]', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable 1 [MvcApplication2.Models.BlogDataEntities]'。 '

這裏是堆棧跟蹤：

  [InvalidOperationException: The model item passed into the dictionary is of type   'System.Collections.Generic.List`1[MvcApplication2.Models.Blog]', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable`1[MvcApplication2.Models.BlogDataEntities]'.] 
      System.Web.Mvc.ViewDataDictionary`1.SetModel(Object value) +324899 
    System.Web.Mvc.ViewDataDictionary..ctor(ViewDataDictionary dictionary) +377 
System.Web.Mvc.WebViewPage`1.SetViewData(ViewDataDictionary viewData) +48 
System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +99 
System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +115 
System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +303 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13 
System.Web.Mvc.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19() +23 
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +260 
System.Web.Mvc.<>c__DisplayClass1e.<InvokeActionResultWithFilters>b__1b() +19 
       System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +177 
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +343 
System.Web.Mvc.Controller.ExecuteCore() +116 
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +97 
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10 
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +37 
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21 
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +12 
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62 
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +50 
System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7 
System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22 
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60 
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9 
     System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8969117 
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184 

這裏是我的BlogController：

  using System; 
     using System.Collections.Generic; 
      using System.Linq; 
      using System.Web; 
      using System.Web.Mvc; 
      using MvcApplication2.Models; 

       namespace MvcApplication2.Controllers 
       { 
     public class BlogController : Controller 
     { 
    // 
    // GET: /Blog/ 

    public ActionResult Index() 
    { 
     using (var db = new BlogDataEntities()) 
     { 
      return View(db.Blogs.ToList()); 
     } 

    } 

    // 
    // GET: /Blog/Details/5 

    public ActionResult Details(int id) 
    { 
     return View(); 
    } 

    // 
    // GET: /Blog/Create 

    public ActionResult Create() 
    { 
     return View(); 
    } 

    // 
    // POST: /Blog/Create 

    [HttpPost] 
    public ActionResult Create(Blog blog) 
    { 
     try 
     { 
      using (var db = new BlogDataEntities()) 
      { 
       db.Blogs.Add(blog); 
       db.SaveChanges(); 
      } 

      return RedirectToAction("Index"); 
     } 
     catch 
     { 
      return View(); 
     } 
    } 


    // 
    // GET: /Blog/Edit/5 

    public ActionResult Edit(int id) 
    { 
     using (var db = new BlogDataEntities()) 
     { 
      return View(db.Blogs.Find(id)); 
     } 

    } 

    // 
    // POST: /Blog/Edit/5 

    [HttpPost] 
    public ActionResult Edit(int id, Blog blog) 
    { 
     try 
     { 
      using (var db = new BlogDataEntities()) 
      { 
       db.Entry(blog).State = System.Data.EntityState.Modified; 
       db.SaveChanges(); 
       return RedirectToAction("Index"); 
      } 
     } 
     catch 
     { 
      return View(); 
     } 
    } 



    // 
    // GET: /Blog/Delete/5 

    public ActionResult Delete(int id) 
    { 
     using (var db = new BlogDataEntities()) 
     { 
      return View(db.Blogs.Find(id)); 
     } 
    } 

    [HttpPost] 
    public ActionResult Delete(int id, Blog blog) 
    { 
     try 
     { 
      using (var db = new BlogDataEntities()) 
      { 
       db.Entry(blog).State = System.Data.EntityState.Deleted; 
       db.SaveChanges(); 
      } 
      return RedirectToAction("Index"); 
     } 
     catch 
     { 
      return View(); 
     } 
    } 
} 

}

Answer 1

的問題是，你有傳遞一個List<Blog>控制器動作實例到強烈鍵入到IEnumerable<BlogDataEntities>的視圖，這是不可能的。

所以，你有這樣的控制器操作：

public ActionResult Foo() 
{ 
    List<Blog> blogs = ... 
    return View(blogs); 
} 

和相應的視圖：

@model IEnumerable<BlogDataEntities> 
... 

這個錯誤發生的另一種可能性是，你的觀點是輸入正確的模式是，控制器操作已通過，但在此視圖內部，您嘗試渲染一個部分，並將其鍵入不同的模型：

@model List<Blog> 
... 
@Html.Partial("_MyPartial") 

其中_MyPartial.cshtml看起來是這樣的：

@model IEnumerable<BlogDataEntities> 
... 

這再一次是不可能的。在這種情況下，您可以使用幫助器Html.Partial的第二個參數來爲此部分提供正確的模型。