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POUnity and ASP.NET WebForms - No parameterless constructor defined for this object
 

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    <p>Does anyone have any good examples of how to make Unity 1.2 or 2.0 work with ASP.NET WebForms? </p> <p>I thought I had this figured out, but evidently I'm missing something. Now I'm getting the error; "No parameterless constructor defined for this object". I remember getting this error a couple years ago, I and just don't remember what I did.</p> <p>Obviously Unity isn't working as it should because somewhere along the way I've forgotten something. Any help would be appreciated.</p> <p>Here's some of my code:</p> <p>Global.asax</p> <pre> using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Security; using System.Web.SessionState; using Microsoft.Practices.Unity; using PIA35.Unity; namespace PIA35.Web { public class Global : System.Web.HttpApplication { protected void Application_Start(object sender, EventArgs e) { IUnityContainer container = Application.GetContainer(); PIA35.Web.IoC.Bootstrapper.Configure(container); } } } </pre> <p>Here's my httpModules section of the web.config file:</p> <pre> &lt;httpModules&gt; &lt;add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt; &lt;add name="UnityHttpModule" type="PIA35.Unity.UnityHttpModule, PIA35.Unity"/&gt; &lt;/httpModules&gt; </pre> <p>Here's the code for my IoC bootstrapper class.</p> <pre> using System; using System.Collections.Generic; using System.Linq; using System.Web; using Microsoft.Practices.Unity; using PIA35.Services.Interfaces; using PIA35.Services; using PIA35.DataObjects.Interfaces; using PIA35.DataObjects.SqlServer; namespace PIA35.Web.IoC { public static class Bootstrapper { public static void Configure(IUnityContainer container) { container .RegisterType&lt;ICategoryService, CategoryService&gt;() .RegisterType&lt;ICustomerService, CustomerService&gt;() .RegisterType&lt;IOrderService, OrderService&gt;() .RegisterType&lt;IOrderDetailService, OrderDetailService&gt;() .RegisterType&lt;IProductService, ProductService&gt;() .RegisterType&lt;ICategoryDao, SqlServerCategoryDao&gt;() .RegisterType&lt;ICustomerDao, SqlServerCustomerDao&gt;() .RegisterType&lt;IOrderDao, SqlServerOrderDao&gt;() .RegisterType&lt;IOrderDetailDao, SqlServerOrderDetailDao&gt;() .RegisterType&lt;IProductDao, SqlServerProductDao&gt;(); } } } </pre> <p>Here's the HttpApplicationStateExtensions.cs file.</p> <pre> using System.Web; using Microsoft.Practices.Unity; namespace PIA35.Unity { public static class HttpApplicationStateExtensions { private const string GlobalContainerKey = "GlobalUnityContainerKey"; public static IUnityContainer GetContainer(this HttpApplicationState application) { application.Lock(); try { IUnityContainer container = application[GlobalContainerKey] as IUnityContainer; if (container == null) { container = new UnityContainer(); application[GlobalContainerKey] = container; } return container; } finally { application.UnLock(); } } } } </pre> <p>Here's my UnityHttpModule.cs file.</p> <pre> using System; using System.Collections.Generic; using System.Web; using System.Web.UI; using Microsoft.Practices.Unity; namespace PIA35.Unity { public class UnityHttpModule : IHttpModule { #region IHttpModule Members /// ///Initializes a module and prepares it to handle requests. /// /// ///An ///that provides access to the methods, properties, ///and events common to all application objects within an ASP.NET application public void Init(HttpApplication context) { context.PreRequestHandlerExecute += OnPreRequestHandlerExecute; } /// ///Disposes of the resources (other than memory) ///used by the module that implements . /// /// public void Dispose() { } #endregion private void OnPreRequestHandlerExecute(object sender, EventArgs e) { IHttpHandler handler = HttpContext.Current.Handler; HttpContext.Current.Application.GetContainer().BuildUp(handler.GetType(), handler); // User Controls are ready to be built up after the page initialization is complete Page page = HttpContext.Current.Handler as Page; if (page != null) { page.InitComplete += OnPageInitComplete; } } // Get the controls in the page's control tree excluding the page itself private IEnumerable GetControlTree(Control root) { foreach (Control child in root.Controls) { yield return child; foreach (Control c in GetControlTree(child)) { yield return c; } } } // Build up each control in the page's control tree private void OnPageInitComplete(object sender, EventArgs e) { Page page = (Page)sender; IUnityContainer container = HttpContext.Current.Application.GetContainer(); foreach (Control c in GetControlTree(page)) { container.BuildUp(c.GetType(), c); } } } } </pre> <p>Here's an example of one of my service classes.</p> <pre> namespace PIA35.Services { public class CategoryService : ICategoryService { #region Dependency Injection private ICategoryDao categoryDao; public CategoryService(ICategoryDao CategoryDao) { this.categoryDao = CategoryDao; } #endregion #region ICategoryService Members public List GetAll() { return categoryDao.GetAll().ToList(); } public Category GetById(int CategoryId) { return categoryDao.GetById(CategoryId); } public void Add(Category model) { categoryDao.Insert(model); } public void Update(Category model) { categoryDao.Update(model); } public void Delete(Category model) { categoryDao.Delete(model); } #endregion } } </pre>
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    1. COOk, I figured out that this actually works. I'm just using it wrong. I'm trying to bind a GridView to an ObjectDataSource which points to the CategoryService class. It doesn't seem like the ObjectDataSource control can take an interface. So I need to do this in code. Oh well.
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