How To Use Server.MapPath When HTTPContext .Current Is Nothing
Jan 20, 2011
I have some code that works fine when I need to delete some image files from a directory on my web server:
Dim ImageURL As String = dsImages.Tables(0).Rows(iImgRow).Item("ImageURL")
Dim physicalName = Server.MapPath(ImageURL)
oUpload.DeleteFileFromServer(physicalName, iAdid, iImgID)
.but I am running into a problem when a maintenance task running in a separate thread at set intervals determines that files like the above need to be deleted:
Dim ImageURL As String = dsImage.Tables(0).Rows(i - 1).Item("ImageURL")
Dim iImgID As Integer = dsImage.Tables(0).Rows(i - 1).Item("ImageId")
Dim physicalName As String = HttpContext.Current.Server.MapPath(ImageURL)
oUpload.DeleteFileFromServer(physicalName, iAdID, iImgID)
In this latter case, HttpContext.Current.Server.MapPath(ImageURL) has a value of Nothing.Is there a way to get the full path for this case?
Does anyone knows why HttpContext.Current.Server.MapPath within a server control works when I run the server control but gives and error whilst in Design mode?
What is the difference between those two? If I only want to retrieve the absoluate path to an image on web server, is Server.MapPath safer in any case? I'm using Page.MapPath right now, but it won't work if control was created in WebService since control.Page property become null? Whether Server.MapPath always work?
In an asynchronous process, I need to get the name of the domain/server the web application is running on. But in that situation HttpContext.Current is not available, so I cant use HttpContext.Current.Request.ServerVariables("SERVER_NAME").
I am using 3.5 .NET VB. In a code behind I am calling a page using this approach:HttpContext.Current.Server.Execute("Survey.aspx").On the survey.aspx page I have several textboxes are varying sizes. If I run the survey.aspx page alone, the textbox appear on the screen in the correctsizesettings. However, when I use the HttpContext.Current.Server.Execute method to execute the survery.aspx page from another page, the textboxes always come back a fixed width of like 200px or so. It doesnt matter what I change the size of the width to in the survey.aspx page, they are always rendered the same size for every textbox on the page. The changes do show up if I view the survey.aspx page alone though without calling it through another page so I know my syntax for changing the width settings is correct.Does anyone have any idea what causes this and how to resolve it? I am stumped.
I have a static class with serveral static methods. In these methods, I'm trying to access the current thread's context using HttpContext.Current. For example:
var userName = HttpContext.Current.User.Identity.Name;
However, when I do that, I receive a NullReferenceException, the infamous "Object reference not set to an instance of an object."
My web application is hosted on a loadbalanced and whenever the requests are routed to one of them(say Server B), the request fails. Now I want to redirect my requests to the working server (Server A) which always works.
I want to do it via the HttpContext.Current.Server = "ServerA";
How can I do this. Do I need to create a new HttpContext Object ?
i'm using an example in which i can fake the session.It's for use in a unittest of a mvc controller.In the test i create a controller and then i do this:
FakeHttpContext httpctx = new FakeHttpContext(null,null,null,null,mSessionItems ); ControllerContext ctx2 = new ControllerContext(httpctx,new RouteData(), target);
here mSessionItems is my session and target is my instance of a controller,and indeed, when i'm in a controller reading this.ControllerContext.HttpContext.Session, i have a session, great!but.... i also read the session outside the controller, and there i use HttpContext.Current.Session, and that is null (or actualy, the HttpContext.Current is null).
As per title. I want to be able to save some data in a cache object but this object must be available to all users/sessions and can expire.What is the best method to achieve this in a asp.net web app?
During Application_End() in Global.aspx, HttpContext.Current is null. I still want to be able to access cache - it's in memory, so want to see if I can reference it somehow to save bits to disk.
Question - is there a way to reference cache in memory somehow when HttpContext.Current is null?
Perhaps I could create a global static variable that would store pointer to cache that I could update on HTTP requests (pseudo: "static <pointer X>" = HttpRequest.Current) and retrieve a reference to cache through that pointer in Application_End()?
Is there a better way to access Cache in memory when there is no Http Request is made?
am writing a web service in vb.net/asp.net 2, that needs user's name. It works fine when the url request is "www.mysite.com" but if any one has logged-in using "mysite.com" without a "www" and goes to the page that calls my web service, The HttpContext.Current.User.Identity.Name gives null. How can I resolve this problem?
Last night I wrote up my first IHttpModule to do some request processing. I'm using a regular expression to inspect the raw url. The IHttpModule will be called on every request, so it seems reasonable to do some sort of caching of the regular expression object to prevent creation of it on every request.
Now my question... what is better: use the HttpContext.Current.Cache to store the instantiated object or to use a private static Regex in my module?I'm looking forward to the reasons why. Just to clarify: the regex will never change and thus always be the same thing.
I wanted to understand the behavior of HttpContext.Current.Application during the load balancing. I have read that session can be stored in disk hence can be retrieved from different servers. Is this true for HttpContext.Current.Application also. Does the keydata stored in one machine is accessible in other different machine too?
I am searching to find a way to read and write on session data but with out having the HttpContext.Current.Why I won to do that ?, because I wish to make some action with the user Session after the page have been close and unloaded. For example, a user load and see a page, then I create a thread to make some action and let user go. Inside this thread I like to read the session data, but in this case HttpContext.Current is not exist any more.
So is there a way to read Session Data knowing just the session id.I store my session inside an sql server, and I see them... its there on table ASPStateTempSessions . How can I read them "offline" and manipulate them ?
I've found myself having a requirement to configure log4net based on a file relative to the physical location of the running ASP.NET web application. We like to start the logger as early as possible, so Application_Start seems a proper place. In IIS6, this works fine and has been running for ages, but now we moved to IIS7 and this won't work anymore:
because the HttpContext.Current is not available in many global.asax (Application, Session) events. This is old news, we all know it raises the now infamous Request is not available in this context error. We don't want to move back to Classic Mode.
Now, the question is simple: without using HttpContext, is it possible to find the physical location of the currently running web application instance?
I have a security manager in my application that works for both windows and web, the process is simple, just takes the user and pwd and authenticates them against a database then sets the Thread.CurrentPrincipal with a custom principal. For windows applications this works fine, but I have problems with web applications.
After the process of authentication, when I'm trying to set the Current.User to the custom principal from Thread.CurrentPrincipal this last one contains a GenericPrincipal. Am I doing something wrong? This is my code:
Why does HttpContext.Current.Request.Url.Host return a different URL than the URL used in the Web browser? For example, when entering "www.someurl.com" in the browser, the HttpContext.Current.Request.Url.Host variable is equal to "www.someotherurl.com".
