asp.net-mvc 在MVC控制器构造函数中获取主机名
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Getting hostname in MVC controller constructor
提问by Ben Power
Is it possible to get the current hostname from the controller constructor?
是否可以从控制器构造函数中获取当前主机名？
Both the Request and HttpContext objects are null, so Request.Url yields nothing.
Request 和 HttpContext 对象都为空，因此 Request.Url 不会产生任何结果。
public class HomeController : Controller
{
private readonly MyEntities _entities;
public HomeController()
{
//
var hostname = Request.Url;
if (hostname.Contains("localhost")) EFConnectionStringName="localhost";
else EFConnectionStringName="default";
_entities = new MyEntities(EFConnectionStringName);
}
...
The greater problem I am trying to solve here is to choose a connection string for Entity Framework based upon the hostname. Ideas?
我在这里尝试解决的更大问题是根据主机名为实体框架选择一个连接字符串。想法？
回答by haim770
Requestis indeed null during the constructionof your Controller. Try this instead:
Request在构建您的控制器期间确实为空。试试这个：
protected override void Initialize(System.Web.Routing.RequestContext requestContext)
{
var hostname = requestContext.HttpContext.Request.Url.Host;
// do something based on 'hostname' value
// ....
base.Initialize(requestContext);
}
Also, please note that Request.Urlwill not return the hostname but a Uriobject from which you can extract the hostname using Url.Host.
另外，请注意，它Request.Url不会返回主机名，而是返回一个Uri对象，您可以使用Url.Host.
See MSDN.
请参阅MSDN。
回答by oxfn
Try this:
尝试这个：
public class HomeController : Controller
{
protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
base.OnActionExecuting(filterContext);
Debug.Print("Host:" + Request.Url.Host); // Accessible here
if (Request.Url.Host == "localhost")
{
// Do what you want for localhost
}
}
}
Note, that Request.Urlis an Uriobject, so you should check Request.Url.Host
注意，这Request.Url是一个Uri对象，所以你应该检查Request.Url.Host
回答by Brian Adriance
Request URL's host doesn't necessarily have to match the hosting server name. For example if you're using DNS CNAMEs or loadbalancers.
请求 URL 的主机不一定必须与托管服务器名称匹配。例如，如果您使用 DNS CNAME 或负载均衡器。
If you'd like the machine name of the server hosting the code, try this in your controller action:
如果您想要托管代码的服务器的机器名称，请在您的控制器操作中尝试：
string hostingMachineName = HttpContext.ApplicationInstance.Server.MachineName;
