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。
