1、实现 MVC3 Beta 中提供的依赖注入接口 IDependencyResolver ，MyDependencyResolver.cs 的代码： 

	

		
		

			using System;   
			

				using System.Collections.Generic;   
				

					using System.Linq;   
					

						using System.Web;   
						

							using System.Web.Mvc;   
							

								using Microsoft.Practices.Unity;   
								

									  
									

										namespace Demo   
										

											{   
											

												    public class MyDependencyResolver : IDependencyResolver   
												

													    {  
													

														        #region IDependencyResolver 成员   
														

															  
															

																        /// <summary>   
																

																	        /// 依赖注入容器   
																	

																		        /// </summary>   
																		

																			        private UnityContainer _unityContainer;   
																			

																				  
																				

																					        /// <summary>   
																					

																						        /// 构造   
																						

																							        /// </summary>   
																							

																								        /// <param name="aUnityContainer">依赖注入容器</param>   
																								

																									        public MyDependencyResolver( UnityContainer aUnityContainer )   
																									

																										        {   
																										

																											            _unityContainer = aUnityContainer;   
																											

																												        }   
																												

																													  
																													

																														        public object GetService( Type aServiceType )   
																														

																															        {   
																															

																																            try  
																																

																																	            {   
																																	

																																		                return _unityContainer.Resolve( aServiceType );   
																																		

																																			            }   
																																			

																																				            catch  
																																				

																																					            {   
																																					

																																						 /// 按微软的要求，此方法，在没有解析到任何对象的情况下，必须返回 null，必须这么做！！！！   
																																						

																																							                return null;   
																																							

																																								            }   
																																								

																																									        }   
																																									

																																										  
																																										

																																											        public IEnumerable<object> GetServices( Type aServiceType )   
																																											

																																												        {   
																																												

																																													            try  
																																													

																																														            {   
																																														

																																															                return _unityContainer.ResolveAll( aServiceType );   
																																															

																																																            }   
																																																

																																																	            catch  
																																																	

																																																		            {   
																																																		

																																																			  /// 按微软的要求，此方法，在没有解析到任何对象的情况下，必须返回空集合，必须这么做！！！！   
																																																			

																																																				                return new List<object>( );   
																																																				

																																																					            }   
																																																					

																																																						        }  
																																																						

																																																							  
																																																							

																																																								        #endregion   
																																																								

																																																									    }   
																																																									

																																																										  
																																																										

																																																											}  
																																																										

																																																											

2、在 Global.asax.cs 中设置依赖注入解析器  DependencyResolver （这是一个全局静态类，也是 MVC3 Beta 新增的）：         

																																																											

																																																												
																																																												

																																																													using System;   
																																																													

																																																														using System.Collections.Generic;   
																																																														

																																																															using System.Linq;   
																																																															

																																																																using System.Web;   
																																																																

																																																																	using System.Web.Mvc;   
																																																																	

																																																																		using System.Web.Routing;   
																																																																		

																																																																			using Microsoft.Practices.Unity;   
																																																																			

																																																																				  
																																																																				

																																																																					namespace Demo   
																																																																					

																																																																						{   
																																																																						

																																																																							    // Note: For instructions on enabling IIS6 or IIS7 classic mode,    
																																																																							

																																																																								    // visit http://go.microsoft.com/?LinkId=9394801   
																																																																								

																																																																									  
																																																																									

																																																																										    public class MvcApplication : System.Web.HttpApplication   
																																																																										

																																																																											    {   
																																																																											

																																																																												 public static void RegisterGlobalFilters( GlobalFilterCollection filters )   
																																																																												

																																																																													        {   
																																																																													

																																																																														            filters.Add( new HandleErrorAttribute( ) );   
																																																																														

																																																																															        }   
																																																																															

																																																																																  
																																																																																

																																																																																	        public static void RegisterRoutes( RouteCollection routes )   
																																																																																	

																																																																																		        {   
																																																																																		

																																																																																			            routes.IgnoreRoute( "{resource}.axd/{*pathInfo}" );   
																																																																																			

																																																																																				  
																																																																																				

																																																																																					            routes.MapRoute(   
																																																																																					

																																																																																						                "Default", // Route name   
																																																																																						

																																																																																							                "{controller}/{action}/{id}", // URL with parameters   
																																																																																							

																																																																																								new { controller = "Home", action = "Index", id = UrlParameter.Optional }   
																																																																																								

																																																																																									            );   
																																																																																									

																																																																																										  
																																																																																										

																																																																																											        }   
																																																																																											

																																																																																												  
																																																																																												

																																																																																													        protected void Application_Start( )   
																																																																																													

																																																																																														        {   
																																																																																														

																																																																																															            AreaRegistration.RegisterAllAreas( );   
																																																																																															

																																																																																																  
																																																																																																

																																																																																																	            RegisterGlobalFilters( GlobalFilters.Filters );   
																																																																																																	

																																																																																																		            RegisterRoutes( RouteTable.Routes );   
																																																																																																		

																																																																																																			            //设置依赖注入   
																																																																																																			

																																																																																																				            RegisterDependency( );   
																																																																																																				

																																																																																																					        }   
																																																																																																					

																																																																																																						  
																																																																																																						

																																																																																																							        private static UnityContainer _Container;   
																																																																																																							

																																																																																																								        public static UnityContainer Container   
																																																																																																								

																																																																																																									        {   
																																																																																																									

																																																																																																										            get  
																																																																																																										

																																																																																																											            {   
																																																																																																											

																																																																																																												                if ( _Container == null )   
																																																																																																												

																																																																																																													                {   
																																																																																																													

																																																																																																														                    _Container = new UnityContainer( );   
																																																																																																														

																																																																																																															                }   
																																																																																																															

																																																																																																																                return _Container;   
																																																																																																																

																																																																																																																	            }   
																																																																																																																	

																																																																																																																		        }   
																																																																																																																		

																																																																																																																			  
																																																																																																																			

																																																																																																																				        protected void RegisterDependency( )   
																																																																																																																				

																																																																																																																					        {   
																																																																																																																					

																																																																																																																						            Container.RegisterType<ITest, Test>( );   
																																																																																																																						

																																																																																																																							 DependencyResolver.SetResolver( new MyDependencyResolver( Container ) );   
																																																																																																																							

																																																																																																																								        }   
																																																																																																																								

																																																																																																																									    }   
																																																																																																																									

																																																																																																																										}  
																																																																																																																									

																																																																																																																										

3、Controller的代码，HomeController.cs：   

																																																																																																																										

																																																																																																																											
																																																																																																																											

																																																																																																																												using System;   
																																																																																																																												

																																																																																																																													using System.Collections.Generic;   
																																																																																																																													

																																																																																																																														using System.Linq;   
																																																																																																																														

																																																																																																																															using System.Web;   
																																																																																																																															

																																																																																																																																using System.Web.Mvc;   
																																																																																																																																

																																																																																																																																	using Microsoft.Practices.Unity;   
																																																																																																																																	

																																																																																																																																		  
																																																																																																																																		

																																																																																																																																			namespace Demo.Controllers   
																																																																																																																																			

																																																																																																																																				{   
																																																																																																																																				

																																																																																																																																					 public class HomeController : Controller   
																																																																																																																																					

																																																																																																																																						    {   
																																																																																																																																						

																																																																																																																																							        [Dependency]   
																																																																																																																																							

																																																																																																																																								        public ITest Test { get; set; }   
																																																																																																																																								

																																																																																																																																									           
																																																																																																																																									

																																																																																																																																										        public ActionResult Index( )   
																																																																																																																																										

																																																																																																																																											        {   
																																																																																																																																											

																																																																																																																																												   ViewModel.Message = Test.GetString( );   
																																																																																																																																												

																																																																																																																																													  
																																																																																																																																													

																																																																																																																																														            return View( );   
																																																																																																																																														

																																																																																																																																															        }   
																																																																																																																																															

																																																																																																																																																  
																																																																																																																																																

																																																																																																																																																	        public ActionResult About( )   
																																																																																																																																																	

																																																																																																																																																		        {   
																																																																																																																																																		

																																																																																																																																																			            return View( );   
																																																																																																																																																			

																																																																																																																																																				        }   
																																																																																																																																																				

																																																																																																																																																					    }   
																																																																																																																																																					

																																																																																																																																																						}  
																																																																																																																																																					

																																																																																																																																																						

4、ITest.cs代码：            

																																																																																																																																																						

																																																																																																																																																							
																																																																																																																																																							

																																																																																																																																																								using System;   
																																																																																																																																																								

																																																																																																																																																									using System.Collections.Generic;   
																																																																																																																																																									

																																																																																																																																																										using System.Linq;   
																																																																																																																																																										

																																																																																																																																																											using System.Text;   
																																																																																																																																																											

																																																																																																																																																												  
																																																																																																																																																												

																																																																																																																																																													namespace Demo   
																																																																																																																																																													

																																																																																																																																																														{   
																																																																																																																																																														

																																																																																																																																																															    public interface ITest   
																																																																																																																																																															

																																																																																																																																																																    {   
																																																																																																																																																																

																																																																																																																																																																	        string GetString( );   
																																																																																																																																																																	

																																																																																																																																																																		    }   
																																																																																																																																																																		

																																																																																																																																																																			}  
																																																																																																																																																																		

																																																																																																																																																																			

5、Test.cs代码：      

																																																																																																																																																																			

																																																																																																																																																																				
																																																																																																																																																																				

																																																																																																																																																																					using System;   
																																																																																																																																																																					

																																																																																																																																																																						using System.Collections.Generic;   
																																																																																																																																																																						

																																																																																																																																																																							using System.Linq;   
																																																																																																																																																																							

																																																																																																																																																																								using System.Web;   
																																																																																																																																																																								

																																																																																																																																																																									  
																																																																																																																																																																									

																																																																																																																																																																										namespace Demo   
																																																																																																																																																																										

																																																																																																																																																																											{   
																																																																																																																																																																											

																																																																																																																																																																												    public class Test:ITest   
																																																																																																																																																																												

																																																																																																																																																																													    {  
																																																																																																																																																																													

																																																																																																																																																																														        #region ITest 成员   
																																																																																																																																																																														

																																																																																																																																																																															  
																																																																																																																																																																															

																																																																																																																																																																																        public string GetString( )   
																																																																																																																																																																																

																																																																																																																																																																																	        {   
																																																																																																																																																																																	

																																																																																																																																																																																		            return "Run demo!";   
																																																																																																																																																																																		

																																																																																																																																																																																			        }  
																																																																																																																																																																																			

																																																																																																																																																																																				  
																																																																																																																																																																																				

																																																																																																																																																																																					        #endregion   
																																																																																																																																																																																					

																																																																																																																																																																																						    }   
																																																																																																																																																																																						

																																																																																																																																																																																							}  
																																																																																																																																																																																						

																																																																																																																																																																																							

 注：这篇文章只适用于 ASP.NET MVC3 Beta 版。

从 MVC1 -> MVC3 Preview1 -> MVC3 Beta 一直都在变化，微软Brad Wilson在自己的博客中也多次提到：

Disclaimer
This blog post talks about ASP.NET MVC 3 Beta, which is a pre-release version. Specific technical details may change before the final release of MVC 3. 

This release is designed to elicit feedback on features with enough time to make meaningful changes before MVC 3 ships,

so please comment on this blog post or contact me if you have comments.

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