ASP.NET MVC学习笔记-Routing及视图引挚解析原理
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;