有一个MVC 2.0应用程序局部视图的问题，当访问的所有突然和东西实际上在ViewData中时，可怕的No parameterless Constructor错误。我已经尽可能地遵循了代码而且我没有在哪里。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>
 
</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>
CatalystModel
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
}
}
在调用SearchView的ListView中发生错误：
＆lt;％Html.RenderAction（“SearchView”，ViewData [“catalystItems”]）; ％GT;
任何帮助??
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
答案 0 :(得分：3)
您的问题是CatalystModel类没有默认构造函数，因此默认模型绑定程序无法在此实例化它：
[ChildActionOnly]
public ViewResult SearchView(CatalystModel model)
{
return View(model);
}
这就是说你正在调用这样的子控制器动作：
<% Html.RenderAction("SearchView", ViewData["catalystItems"]); %>
完全没用，严格没有价值。
为什么不直接渲染部分：
<% Html.RenderPartial("SearchView", ViewData["catalystItems"]); %>
您还应该阅读Haacked blog post以更好地理解RenderAction和RenderPartial之间的差异。
或者，如果你真的（出于某些神秘的原因）有控制器操作，将一些没有默认构造函数的模型作为操作参数，你需要为这种类型编写一个自定义模型绑定器，并指定你应该使用哪个自定义构造函数用来实例化它，当然应该传递给它的值。
答案 1 :(得分：0)
试试这个：
<% Html.RenderAction("SearchView", new { model = ViewData["catalystItems"] }); %>