asp.net-mvc - MVC asp.net PartialView 导致无参数构造函数错误？

Question

MVC 2.0 应用程序部分视图出现问题，在访问时突然发现东西实际上在 ViewData 中，这是可怕的 No parameterless Constructor 错误。我已尽可能多地遵循代码，但我无处可去。这是我的代码：

控制器：

  using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.Mvc;
    using System.ComponentModel;
    using CINet.Areas.CatalystSearch.Models.Interfaces;
    using CINet.Areas.CatalystSearch.Models.Repository;
    using CINet.Areas.CatalystSearch.Models.Entities;

    namespace CINet.Areas.CatalystSearch.Controllers
    {
        public class CatalystSearchController : Controller
        {
           // private SqlCatalystRepository _catalystItemRepository;
            private ICatalystRepository _catalystInterface;
            public int PageSize = 10; // Regulates size of page

        #region CONSTRUCTOR

        /// <summary>
        /// Constructor which sets the passed repository to the local current 
        /// repository
        /// </summary>
        /// <param name="catalystRepository">Interface repository for controller</param>
        public CatalystSearchController()
        {

        }

        #endregion

        #region  DEFAULT VIEW


        public ViewResult List([DefaultValue("")] string manufactureName, [DefaultValue("")] string manufacturePartNumber, [DefaultValue("")] string description, [DefaultValue(1)] int page)
        {

            IQueryable<CatalystItem> query = null;
            CatalystFilter userFilter = new CatalystFilter();
            int totalItems = 0;

           // Be sure that the manufacture drop down has been selected
            if (manufactureName != "")
            {
                // Set up CatalystFilter
                userFilter.Manufacture = manufactureName;
               userFilter.DescriptionFilter = description;
                userFilter.ManufacturePartNumberFilter = manufacturePartNumber;

                // connection string for SQL
                string connString = "Data Source=se-cinet-dev;Initial Catalog=cinet;User ID=sa;Password=Carouse1";


                // Get interface
                _catalystInterface = new CatalystRepository(connString);


                // Collects data from SQL repository and updates private local copy
               // _catalystItemRepository = new SqlCatalystRepository(connString);

                // Fills with list of Catalystitems based on filter.
                query = _catalystInterface.GetCatalystItems(userFilter, page, PageSize);
                // query = _catalystItemRepository.GetItems(userFilter, page, PageSize);

                // Returns int of total items in list
                totalItems = _catalystInterface.GetTotalOfItems(userFilter);
                // totalItems = _catalystItemRepository.GetTotalOfItems(userFilter);

                // Set up view model for passing to View
                var viewModel = new CatalystModel
                {

                    catalystItems = query.ToList(),
                    catalystFilter = userFilter,

                    /* Pass Paging properties to model*/
                    PagingInfo = new PagingInfo
                    {
                        CurrentPage = page,
                        ItemsPerPage = PageSize,
                        TotalItems = totalItems

                    },
                    ManufactureName = manufactureName

                };

                // View Data to be passed to SearchView
                ViewData["catalystItems"] = viewModel;


                return View(viewModel);
            }

            else
            {
                var viewModel = new CatalystModel();
                return View(viewModel);
            }
        }

        #endregion

        #region SEARCH VIEW

        /// <summary>
        /// Partial View used to display results from controller
        /// </summary>
        /// <param name="model"> model passed via ViewData from List View</param>
        /// <returns></returns>
        [ChildActionOnly]
        public ViewResult SearchView(CatalystModel model)
        {
            return View(model);
        }

        #endregion

    }
}

listView:

    <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<CINet.Areas.CatalystSearch.Models.Entities.CatalystModel>" %>
<%@ Import Namespace="CINet.Areas.CatalystSearch.HtmlHelpers" %>
<%@ Import Namespace="CINet.Areas.CatalystSearch.Models" %>
<%@ Import Namespace="CINet.Areas.CatalystSearch.Models.Interfaces" %>

<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">

    <div>
        <center>
            <strong>
                <%= Html.ValidationSummary("Please fill out required Fields") %></strong> 

                <h1>Catalyst Search Provider</h1>
            <hr />
            <%-- "Search","Catalyst" --%>
            <% 
                using (Html.BeginForm())
                { %>
            <table border="1">

               <tr>
                <td>Enter Description (optional):</td>
                <td>
                <%: Html.TextBoxFor(x=>x.Description) %>
                </td>
                </tr>

                <tr>
                <td>Enter Part Number (optional):</td>
                <td>
                <%: Html.TextBoxFor(x=>x.ManufacturePartNumber) %>
                </td>
                </tr>

                <tr>
                    <td>Choose Manufacture:
                    </td>
                    <td>
                        <%: Html.DropDownListFor(x => x.ManufactureName, Model.GetAllManufactures()) %>
                       <%--  <%: Html.DropDownList("ManufactureName", Model.GetAllManufactures(),"Choose Item")%> --%>
                    </td>
                </tr>
                <tr>
                    <td>
                        &nbsp
                    </td>
                    <td>
                        <input type="submit" name="Search" value="Search" />
                    </td>
                </tr>
            </table>
            <% } Html.EndForm();  %>
            <!-- RENDERS PARTIAL VIEW TO DISPLAY GRID WITH SEARCH RESULTS -->
            <% Html.RenderAction("SearchView", ViewData["catalystItems"]); %>
            <br />
        </center>
    </div>
    <div class="pager">

       <% if (Model.PagingInfo != null)
          { %>
        <%: Html.PageLinks(Model.PagingInfo, x => Url.Action("List", new { page = x, manufactureName = Model.catalystFilter.Manufacture, description = Model.catalystFilter.DescriptionFilter, manufacturePartNumber = Model.catalystFilter.ManufacturePartNumberFilter }))%>
        <% } %>
    </div>

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="head" runat="server">
</asp:Content>


SearchView:

    <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<CINet.Areas.CatalystSearch.Models.Entities.CatalystModel>" %>
<%@ Import Namespace="CINet.Areas.CatalystSearch.HtmlHelpers" %>
<%@ Import Namespace="CINet.Areas.CatalystSearch.Models" %>

 <div>
    <% if (Model.catalystItems != null)
       { %>
        <table class="CatalystTableSpacer">
            <tr>
                <td>
                    Contract Price
                </td>
                <td>
                    Description
                </td>
                <td>
                    Manufacture Name
                </td>
                <td>
                    Manufacture Part Number
                </td>
                <td>
                    MSRP Price
                </td>
                <td>
                    Quantity Available
                </td>

            </tr>
            <% foreach (var items in Model.catalystItems)
               {%>
            <tr>
                <td>
                    <%: items.ContractPrice%>
                </td>
                <td>
                    <%: items.Description%>
                </td>
                <td>
                    <%: items.ManufactureName%>
                </td>
                <td>
                    <%: items.ManufacturePartNumber%>
                </td>
                <td>
                   <%: items.MSRPrice%>
                </td>
                <td>
                    <%: items.QuantityAvailable%>
                </td>

            </tr>
            <% }
       }

                %>
            </table>

           </div>

催化剂模型

   using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using CINet.Areas.CatalystSearch.Models.Entities;
using System.ComponentModel.DataAnnotations;
using CINet.Areas.CatalystSearch.Models.Repository;
using CINet.Areas.CatalystSearch.Models.Interfaces;

namespace CINet.Areas.CatalystSearch.Models.Entities
{
    public class CatalystModel
    {

          #region PRIVATE FIELDS

        private string _connectionString = "Data Source=se-cinet-dev;Initial Catalog=cinet;User ID=sa;Password=Carouse1"; // connection string for SQL
        private ICatalystRepository _repository = null;

        #endregion
    #region PUBLIC PROPERTIES

    public IList<CatalystItem> catalystItems { get; set; }
    public PagingInfo PagingInfo { get; set; }
    public CatalystFilter catalystFilter { get; set; }
    public SelectList Manufactures { get; set; }
    public SelectList Categories { get; set; }

    [Required]
    public string ManufactureName { get; set; }

    public string Description { get; set; }

    public string ManufacturePartNumber { get; set; }

    #endregion


    #region CONSTRUCTOR

    /// <summary>
    /// Constructor instantiates SQL DB Connection
    /// </summary>
    public CatalystModel()
    {
        _repository = new CatalystRepository(_connectionString);
     //   Manufactures = GetAllManufactures();
    }



    #endregion

    #region PUBLIC GET LISTS

    /// <summary>
    /// Returns ALL Manufactures in Database
    /// </summary>
    /// <returns></returns>
    public SelectList GetAllManufactures()
    {
        SelectList manufactureNameSelectList;
        List<Manufacture> manufactureTempList = new List<Manufacture>();

        // Get List from DB
        manufactureTempList = _repository.GetManufactureList();

        // PUSH LIST INTO SELECT LIST
        manufactureNameSelectList = new SelectList(manufactureTempList, "ManufactureName", "ManufactureName");

        return manufactureNameSelectList;
    }



    #endregion

}

}

错误发生在调用 SearchView 的 ListView 中：

<% Html.RenderAction("SearchView", ViewData["catalystItems"]); %>

有什么帮助吗？？

实际错误：

Server Error in '/' Application.
--------------------------------------------------------------------------------

No parameterless constructor defined for this object. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.MissingMethodException: No parameterless constructor defined for this object.

Source Error: 


Line 53:             <!-- RENDERS PARTIAL VIEW TO DISPLAY GRID WITH SEARCH RESULTS -->
Line 54:           <%-- <% Html.RenderPartial("SearchView", ViewData["catalystItems"]); %>
Line 55:           --%> <% Html.RenderAction("SearchView", ViewData["catalystItems"]); %>
Line 56:             
Line 57:             <br />


Source File: c:\Users\gcoleman\Documents\Source Code\Sandbox\Jonathan Henk\MVC\CINet\CINet\Areas\CatalystSearch\Views\CatalystSearch\List.aspx    Line: 55 

Stack Trace: 


[MissingMethodException: No parameterless constructor defined for this object.]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0
   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache) +98
   System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache) +241
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +69
   System.Activator.CreateInstance(Type type) +6
   System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType) +403
   System.Web.Mvc.DefaultModelBinder.BindSimpleModel(ControllerContext controllerContext, ModelBindingContext bindingContext, ValueProviderResult valueProviderResult) +544
   System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +479
   System.Web.Mvc.DefaultModelBinder.GetPropertyValue(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor, IModelBinder propertyBinder) +45
   System.Web.Mvc.DefaultModelBinder.BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor) +658
   System.Web.Mvc.DefaultModelBinder.BindProperties(ControllerContext controllerContext, ModelBindingContext bindingContext) +147
   System.Web.Mvc.DefaultModelBinder.BindComplexElementalModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Object model) +98
   System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +2504
   System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +548
   System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +475
   System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +181
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +830
   System.Web.Mvc.Controller.ExecuteCore() +136
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +111
   System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +39
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +65
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +44
   System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +42
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +141
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +54
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +52
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +38
   System.Web.Mvc.<>c__DisplayClassa.<EndProcessRequest>b__9() +44
   System.Web.Mvc.<>c__DisplayClass4.<Wrap>b__3() +34
   System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Func`1 func) +76
   System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Action action) +113
   System.Web.Mvc.ServerExecuteHttpHandlerAsyncWrapper.EndProcessRequest(IAsyncResult result) +124
   System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +1072

[HttpException (0x80004005): Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'.]
   System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +3058371
   System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage) +77
   System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +28
   System.Web.HttpServerUtilityWrapper.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +22
   System.Web.Mvc.Html.ChildActionExtensions.ActionHelper(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues, TextWriter textWriter) +766
   System.Web.Mvc.Html.ChildActionExtensions.RenderAction(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues) +98
   System.Web.Mvc.Html.ChildActionExtensions.RenderAction(HtmlHelper htmlHelper, String actionName, Object routeValues) +65
   ASP.areas_catalystsearch_views_catalystsearch_list_aspx.__RenderContent1(HtmlTextWriter __w, Control parameterContainer) in c:\Users\gcoleman\Documents\Source Code\Sandbox\Jonathan Henk\MVC\CINet\CINet\Areas\CatalystSearch\Views\CatalystSearch\List.aspx:55
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +109
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
   System.Web.UI.Control.Render(HtmlTextWriter writer) +10
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   ASP.views_shared_site_master.__Renderform1(HtmlTextWriter __w, Control parameterContainer) in c:\Users\gcoleman\Documents\Source Code\Sandbox\Jonathan Henk\MVC\CINet\CINet\Views\Shared\Site.Master:26
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +109
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +8820669
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +31
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +53
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +40
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
   System.Web.UI.Control.Render(HtmlTextWriter writer) +10
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
   System.Web.UI.Page.Render(HtmlTextWriter writer) +29
   System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer) +56
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3060




--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.237 

Answer 1

您的问题是CatalystModel该类没有默认构造函数，因此默认模型绑定器无法在此处实例化它：

[ChildActionOnly]
public ViewResult SearchView(CatalystModel model)
{
    return View(model);
}

据说有这样一个子控制器操作，您正在调用这样的操作：

<% Html.RenderAction("SearchView", ViewData["catalystItems"]); %>

完全没用，严格来说没有任何价值。

为什么不直接渲染部分：

<% Html.RenderPartial("SearchView", ViewData["catalystItems"]); %>

您还应该阅读Haacked 博客文章，以更好地了解 RenderAction 和 RenderPartial 之间的区别。

或者，如果您确实（出于某种神秘的原因）有控制器操作，这些操作将一些没有默认构造函数的模型作为操作参数，您将需要为此类型编写自定义模型绑定器并指定应该使用哪些自定义构造函数来实例化它当然应该传递给它什么值。

Answer 2

试试这个：

<% Html.RenderAction("SearchView", new { model = ViewData["catalystItems"] }); %>