I'm want to run a "background job" in my ASP.NET application (periodically, as separate thread). And I need host name (DNS name or IP) to do my tasks. The problem - HttpContext.Current may be not available here (it's NULL).
Is there any way to get a host name in not using HttpContext.Current.Request.Url.Host.
When the host name is available in HttpContext.Request.Url.Host, it is a result of the host name being part of the request sent by the client. As an example, take a request to this page:
GET /questions/2164261/get-host-name-without-using-httprequest HTTP/1.1 Host: stackoverflow.com ...
When running in a background thread, no request context is available, and there really is no concept of a host name at all. Your only alternative is to store the hostname within the code or in configuration.
Slightly off topic: Running scheduled tasks within a web application is asking for trouble, and spawning threads only deals with a few of them. If at all possible, consider running your scheduled jobs from a Windows service, possibly built using a framework like NCron.
probably you can add a class variable in your thread class, and set this variable with request.url.host before you run the thread class.
this method can also apply to the session object.
Keep in mind that it's a bad idea to initiate that "background job" from a web application if you need that background process to run 24/7 independently. Even if you start it in a new thread. Your web app may have no requests for some time. In this case the run time will shut down the process and all its "child" threads. For continuous running you need to run it as a Windows service. Otherwise, the Darren is right, use the System.Net.Dns.GetHostName().