自從微軟發佈 ASP.NET MVC 和routing engine (System.Web.Routing)以來,就設法讓咱們明白你徹底能控制URL和routing,只要與你的application path相結合進行擴展,任何問題都迎刃而解。若是你須要在所處的域或者子域處理數據標記的話,強制使用Default。html
遺憾的是,ASP.NET MVC是基於虛擬目錄的,在實際項目卻有各類各樣的需求方案。app
例如:dom
1:應用程序是多語言的,像cn.example.com應該被匹配到「www.{language}example.com」路由上。ide
2:應用程序是多用戶的,像username.example.com應該被匹配到「www.{clientname}.example.com」路由上。post
3:應用程序是多子域的,像mobile.example.com應該被匹配到"www.{controller}.example.com/{action}....」 。ui
坐下來,深呼吸,開始咱們ASP.NET MVC的神奇之旅吧。this
定義routes
下面是咱們定義簡單的route,不帶任何controller控制的route:lua
routes.Add("DomainRoute", new DomainRoute(
"home.example.com", // Domain with parameters
"{action}/{id}", // URL with parameters
new { controller = "Home", action = "Index", id = "" } // Parameter defaults
));
另外一個例子是用咱們的controller控制域名:spa
Code
打算用controller 和action徹底控制域名?code
routes.Add("DomainRoute", new DomainRoute(
"{controller}-{action}.example.com", // Domain with parameters
"{id}", // URL with parameters
new { controller = "Home", action = "Index", id = "" } // Parameter defaults
));
接下來是多語言route:
routes.Add("DomainRoute", new DomainRoute(
"{language}.example.com", // Domain with parameters
"{controller}/{action}/{id}", // URL with parameters
new { language = "en", controller = "Home", action = "Index", id = "" } // Parameter defaults
));
HtmlHelper 擴展方法
由於咱們不但願全部的URL所產生HtmlHelper ActionLink要使用full URLs,第一件事咱們會添加一些新的ActionLink,其中載有boolean flag是否要full URLs或沒有。利用這些,如今您能夠添加一個連接到一個Action以下:
<%= Html.ActionLink("About", "About", "Home", true)%>
跟你以往的習慣沒有什麼不一樣,不是嗎?
如下是一小段代碼:
public static class LinkExtensions
{
public static string ActionLink(this HtmlHelper htmlHelper, string linkText, string actionName, string controllerName, bool requireAbsoluteUrl)
{
return htmlHelper.ActionLink(linkText, actionName, controllerName, new RouteValueDictionary(), new RouteValueDictionary(), requireAbsoluteUrl);
}
// more of these
public static string ActionLink(this HtmlHelper htmlHelper, string linkText, string actionName, string controllerName, RouteValueDictionary routeValues, IDictionary<string, object> htmlAttributes, bool requireAbsoluteUrl)
{
if (requireAbsoluteUrl)
{
HttpContextBase currentContext = new HttpContextWrapper(HttpContext.Current);
RouteData routeData = RouteTable.Routes.GetRouteData(currentContext);
routeData.Values["controller"] = controllerName;
routeData.Values["action"] = actionName;
DomainRoute domainRoute = routeData.Route as DomainRoute;
if (domainRoute != null)
{
DomainData domainData = domainRoute.GetDomainData(new RequestContext(currentContext, routeData), routeData.Values);
return htmlHelper.ActionLink(linkText, actionName, controllerName, domainData.Protocol, domainData.HostName, domainData.Fragment, routeData.Values, null);
}
}
return htmlHelper.ActionLink(linkText, actionName, controllerName, routeValues, htmlAttributes);
}
}
在這沒什麼特別的:有許多的擴展方法,把擴展的URL加到域名上。這是一個預設ActionLink helpers,個人精神食糧來了DomainRoute class(詳見:Dark Magic)
Dark magic
瞥眼之間,您可能已經看到了個人DomainRoute類代碼段。這個類其實是提取子域,並增長了象徵性支持域部分的傳入的URL,
咱們將擴展基類,它已經給了咱們一些屬性和方法,可是咱們得重寫他們!
public class DomainRoute : Route
{
//
public string Domain { get; set; }
//
public override RouteData GetRouteData(HttpContextBase httpContext)
{
// 構造regex
domainRegex = CreateRegex(Domain);
pathRegex = CreateRegex(Url);
// 請求信息
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);
// Route 數據
RouteData data = null;
if (domainMatch.Success && pathMatch.Success)
{
data = new RouteData(this, RouteHandler);
// 添加默認選項
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;
}
}
}
}
// 匹配域名路徑
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)
{
// 得到主機名
string hostname = Domain;
foreach (KeyValuePair<string, object> pair in values)
{
hostname = hostname.Replace("{" + pair.Key + "}", pair.Value.ToString());
}
// Return 域名數據
return new DomainData
{
Protocol = "http",
HostName = hostname,
Fragment = ""
};
}
//
}
哇,這是一串按照咱們定義的route轉換傳入請求的URL到tokens的代碼,咱們這樣作是轉換{controller}和按照regex而後再嘗試匹配route規則,在咱們的DomainRoute class裏還有其餘的helper方法,須要更多的功能能夠本身研究擴展。
附代碼:附件