调用流程，不多阐述，请看下图

 

下面通过代码执行流程演示

 

1.浏览器请求：http://localhost/SimpleMvc/Home/Index

2.在Global.asax文件的Application_Start方法中注册路由服务

protected void Application_Start(object sender, EventArgs e)        {            RouteTable.Routes.Add("default", new Route("{controller}/{action}",new SimpleRouteHandler()));        } controller\action会直接映射为路由表中的keyValue键值，方便下一步路

3. 1的url会通过路由表进入IRouteHandler（自定义SimpleRouteHandler）

public class SimpleRouteHandler:IRouteHandler    {        public IHttpHandler GetHttpHandler(RequestContext requestContext)        {            return new SimpleHttpHandler(requestContext.RouteData.Values);        }    } 这里只是演示mvc的原理，因此只将路由相关的数据传递下去，实际场景中还有很多其他的参数需要映射和传

4.参考上面的实现，我们这里只把路由数据传递给IHttpHandler（自定义SimpleHttpHandler）

public class SimpleHttpHandler:IHttpHandler    {        public SimpleHttpHandler(RouteValueDictionary routeData)        {            _routeData = routeData;        }        private RouteValueDictionary _routeData;        public bool IsReusable        {            get { throw new NotImplementedException(); }        }        /// 
        /// 通过controller，action激活Controller，然后执行Action，返回结果        /// 
        ///         public void ProcessRequest(HttpContext context)        {            var model = new SimpleModle();             model.Controller =_routeData["controller"].ToString();             model.Action =_routeData["action"].ToString();                       var control = ControllerFactory.Instance.GetController(model.Controller);            if (control!=null)            {                var view = control.Excute(model.Action, new object[] { model });                if (view!=null)                {                    context.Response.Write(view);                    return;                }            }            context.Response.Write("
不支持该请求
");        }    }

4.1如何激活controller可以参考以下代码

public class ControllerFactory    {        private ControllerFactory()        {        }        static ControllerFactory()        {        }        private const string END = "Controller";        private static object syn = new object();        private Dictionary
     
       _contrDc = new Dictionary
      
       ();        public static readonly ControllerFactory Instance = new ControllerFactory();        /// 
       
        /// 根据controller名称返回实例        /// 
        /// 
               /// 
               public IController GetController(string controllerName)        {            if (!string.IsNullOrEmpty(controllerName))            {                if (!controllerName.EndsWith(END))                {                    controllerName += END;                }                if (!_contrDc.ContainsKey(controllerName))                {                    lock (syn)                    {                        if (!_contrDc.ContainsKey(controllerName))                        {                            var type = Assembly.GetExecutingAssembly().GetTypes().FirstOrDefault(s => typeof(IController).IsAssignableFrom(s) && string.Equals(s.Name, controllerName, StringComparison.InvariantCultureIgnoreCase));                            _contrDc.Add(controllerName, type);                        }                    }                }                if (_contrDc[controllerName] != null)                {                    return (IController)Activator.CreateInstance(_contrDc[controllerName]);                }            }            return null;        }    }
      
     

4.2，controller如何执行action，可以参考一下代码

public interface IController    {        object Excute(string action, object[] parameters);    }    public abstract class ControllerBase : IController    {        public virtual object Excute(string action,object[] parameters)        {            var method = this.GetType().GetMethod(action);            if (method!=null)            {               return method.Invoke(this, parameters);            }            return null;        }    }    public class HomeController : IController    {        public object Excute(string action, object[] parameters)        {            var model = parameters[0] as SimpleModle;            string content = "参数无效";            if (model != null)            {                content = string.Format("Controller:{0}
Action:{1}", model.Controller, model.Action);            }            return new RawContentResult(content);        }    }

4.3 简单的Modle

public class SimpleModle    {        public string Controller { get; set; }        public string Action { get; set; }    }

4.4 简单的view

public abstract class ActionResult    {    }  class RawContentResult : ActionResult    {        public RawContentResult(string content)        {            Content = content;        }        public string Content { get; set; }        public override string ToString()        {            return Content;        }

 

5.返回结果：