ASP.NET MVC学习笔记-Routing及视图引挚解析原理

2019-11-17 04:02:20

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首先打开项目的Global.asax.cs文件,我们将看到页面重写规则如下:

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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 = "" }  // Parameter defaults
    );
}
protected void application_Start()
{
    RegisterRoutes(RouteTable.Routes);
}
        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 = "" }  // Parameter defaults
            );
        }
        protected void Application_Start()
        {
            RegisterRoutes(RouteTable.Routes);
        }

MapRoute()重载如下:

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MapRoute( string name, string url);
MapRoute( string name, string url, object defaults);
MapRoute( string name, string url, string[] namespaces);
MapRoute( string name, string url, object defaults, object constraints);
MapRoute( string name, string url, object defaults, string[] namespaces);
MapRoute( string name, string url, object defaults, object constraints, string[] namespaces);
MapRoute( string name, string url);
MapRoute( string name, string url, object defaults);
MapRoute( string name, string url, string[] namespaces);
MapRoute( string name, string url, object defaults, object constraints);
MapRoute( string name, string url, object defaults, string[] namespaces);
MapRoute( string name, string url, object defaults, object constraints, string[] namespaces);

创建一个Route类实例,最关键的是为以下几个属性赋值:

属性名称说明举例
Constraints  获取或设置为 URL 参数指定有效值的表达式的词典。  {controller}/{action}/{id}
DataTokens  获取或设置传递到路由处理程序但未用于确定该路由是否匹配 URL 模式的自定义值。  new RouteValueDictionary { { "format", "short" } }
Defaults       获取或设置要在 URL 不包含所有参数时使用的值。 new { controller = "Home", action = "Index", id = "" }
RouteHandler  获取或设置处理路由请求的对象。 new MvcRouteHandler()
Url               获取或设置路由的 URL 模式。  new { controller = @"[^/.]*" }

      asp.net MVC会将url请求根据重写规则导向相应的controller中，然后在controller中调用相应的view()方法，然后在ViewEngines中找到相匹配的ViewEngine查找并创建View实现页面解析，ASP.net MVC提供了VirtualPathProviderViewEngine实现了查找View的功能。

     在IViewEngine中提供了母版及视图的路径格式字串的属性，格式如下:

     MasterLocationFormats = new[] {
                "~/Views/{1}/{0}.master",
                "~/Views/Shared/{0}.master"
            };

       ViewLocationFormats = new[] {
                "~/Views/{1}/{0}.aspx",
                "~/Views/{1}/{0}.ascx",
                "~/Views//Shared/{0}.aspx",
                "~/Views/Shared/{0}.ascx"
            };

      PartialViewLocationFormats = ViewLocationFormats;

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