ASP.NET MVC3.0或4.0设置二级域名的方法

假如网站主域名是：www.abc.com

实现二级域名是:     tianjin.abc.com , shanxi.abc.com 这个样子。

首先定义DomainData、DomainRoute类

 

public class DomainRoute : Route
    {
        private Regex domainRegex;
        private Regex pathRegex;

        public string Domain { get; set; }

        public DomainRoute(string domain, string url, RouteValueDictionary defaults)
            : base(url, defaults, new MvcRouteHandler())
        {
            Domain = domain;
        }

        public DomainRoute(string domain, string url, RouteValueDictionary defaults, IRouteHandler routeHandler)
            : base(url, defaults, routeHandler)
        {
            Domain = domain;
        }

        public DomainRoute(string domain, string url, object defaults)
            : base(url, new RouteValueDictionary(defaults), new MvcRouteHandler())
        {
            Domain = domain;
        }

        public DomainRoute(string domain, string url, object defaults, IRouteHandler routeHandler)
            : base(url, new RouteValueDictionary(defaults), routeHandler)
        {
            Domain = domain;
        }

        public override RouteData GetRouteData(HttpContextBase httpContext)
        {
            // 构造 regex
            domainRegex = CreateRegex(Domain);
            pathRegex = CreateRegex(Url);

            // 请求信息
            string requestDomain = httpContext.Request.Headers["host"];
            if (!string.IsNullOrEmpty(requestDomain))
            {
                if (requestDomain.IndexOf(":") > 0)
                {
                    requestDomain = requestDomain.Substring(0, requestDomain.IndexOf(":"));
                }
            }
            else
            {
                requestDomain = httpContext.Request.Url.Host;
            }
            string requestPath = httpContext.Request.AppRelativeCurrentExecutionFilePath.Substring(2) + httpContext.Request.PathInfo;

            // 匹配域名和路由
            Match domainMatch = domainRegex.Match(requestDomain);
            Match pathMatch = pathRegex.Match(requestPath);

            // 路由数据
            RouteData data = null;
            if (domainMatch.Success && pathMatch.Success)
            {
                data = new RouteData(this, RouteHandler);

                // 添加默认选项
                if (Defaults != null)
                {
                    foreach (KeyValuePair<string, object> item in Defaults)
                    {
                        data.Values[item.Key] = item.Value;
                    }
                }

                // 匹配域名路由
                for (int i = 1; i < domainMatch.Groups.Count; i++)
                {
                    Group group = domainMatch.Groups[i];
                    if (group.Success)
                    {
                        string key = domainRegex.GroupNameFromNumber(i);

                        if (!string.IsNullOrEmpty(key) && !char.IsNumber(key, 0))
                        {
                            if (!string.IsNullOrEmpty(group.Value))
                            {
                                data.Values[key] = group.Value;
                            }
                        }
                    }
                }

                // 匹配域名路径
                for (int i = 1; i < pathMatch.Groups.Count; i++)
                {
                    Group group = pathMatch.Groups[i];
                    if (group.Success)
                    {
                        string key = pathRegex.GroupNameFromNumber(i);

                        if (!string.IsNullOrEmpty(key) && !char.IsNumber(key, 0))
                        {
                            if (!string.IsNullOrEmpty(group.Value))
                            {
                                data.Values[key] = group.Value;
                            }
                        }
                    }
                }
            }

            return data;
        }

        public override VirtualPathData GetVirtualPath(RequestContext requestContext, RouteValueDictionary values)
        {
            return base.GetVirtualPath(requestContext, RemoveDomainTokens(values));
        }

        public DomainData GetDomainData(RequestContext requestContext, RouteValueDictionary values)
        {
            // 获得主机名
            string hostname = Domain;
            foreach (KeyValuePair<string, object> pair in values)
            {
                hostname = hostname.Replace("{" + pair.Key + "}", pair.Value.ToString());
            }

            // Return 域名数据
            return new DomainData
            {
                Protocol = "http",
                HostName = hostname,
                Fragment = ""
            };
        }

        private Regex CreateRegex(string source)
        {
            // 替换
            source = source.Replace("/", @"/?");
            source = source.Replace(".", @".?");
            source = source.Replace("-", @"-?");
            source = source.Replace("{", @"(?<");
            source = source.Replace("}", @">([a-zA-Z0-9_]*))");

            return new Regex("^" + source + "$");
        }

        private RouteValueDictionary RemoveDomainTokens(RouteValueDictionary values)
        {
            Regex tokenRegex = new Regex(@"({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?({[a-zA-Z0-9_]*})*-?.?/?");
            Match tokenMatch = tokenRegex.Match(Domain);
            for (int i = 0; i < tokenMatch.Groups.Count; i++)
            {
                Group group = tokenMatch.Groups[i];
                if (group.Success)
                {
                    string key = group.Value.Replace("{", "").Replace("}", "");
                    if (values.ContainsKey(key))
                        values.Remove(key);
                }
            }

            return values;
        }
    }
    public class DomainData
    {
        public string Protocol { get; set; }
        public string HostName { get; set; }
        public string Fragment { get; set; }
    }

 如果项目是MVC4.0那么就打开App_Start 文件夹下面的RouteConfig.cs路由配置文件，如果是MVC3.0项目则添加路由，Global.asax 文件默认的MVC 路由的代码

 

public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                "Default", 
                "{controller}/{action}/{id}",
                new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );

        }

 修改后的路由如下：

 

 public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
            routes.Add(
            "@DomainRoute", new DomainRoute(
            "abc.com",     
            "{controller}/{action}/{id}",
            new { controller = "Home", action = "Index", id = UrlParameter.Optional }
          ));
            routes.Add(
             "wwwDomainRoute", new DomainRoute(
             "www.abc.com",   
             "{controller}/{action}/{id}", 
             new { controller = "Home", action = "Index", id = UrlParameter.Optional }
           ));
            routes.Add(
               "DomainRoute", new DomainRoute(
               "{CityNameUrl}.abc.com",  
               "{controller}/{action}/{id}",   
             new { CityNameUrl = "", controller = "Home", action = "City", id = "" } 
             ));
            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );

        }

     当然这个路由解析匹配顺序是按照你们的需求去修改，但是路由匹配规则是从上到下的找符合的一条进行匹配，如果匹配到则不继续往下走，还需要说明一点， 我的域名是在万网注册的。所以还需要在域名解析那一块添加一条泛解析规则：

然后再程序中获取tianjin.abc.com 获取前缀名称tianjin这个动态参数的方法是：

 var cityName = RouteData.Values["CityNameUrl"]; 就可以得到。