I have MVC 2 site, and I.E is cacheing word documents linked on my site. I know there is a way to clear cache before every action in the controller. But for these links i am not using action, i am just creating regular href links.. Is there anyway i can clear the cache?
View 2 Replies I'm running an ASP.NET MVC website where several page controllers are decorated with an output cache attribute like:
[OutputCache(Duration = someduration..., VaryByParam = "*")]
These are typically forms where some lookup data are drawn from a database. These data change rarely, so the cache duration is typically set to 24 hours. Anyway, my question is: when the sql server is updated with new data in this area, is there a way of forcing such pages to "refresh" rather than keeping the cached output? Or if this cannot be done, is there at least a way of clearing the whole cache for the website?
I have a new ASP.Net web project and every time I change anything in the CSS file I need to delete temp internet files before I can see my changes?
View 8 RepliesUsers can edit images downloaded from my site and then upload them back using a WCF Web Service. The problem is when users go to view images, they often do not see the latest versions because of caching. I'd rather not turn off the cache because it substantially reduces bandwidth. Is there a way to have the Web Service perform some action upon an upload to notify the next web client call that the image has changed?
View 2 Repliesi have a rest url which inserts data, on insertion of the data i want to clear the cache?
View 1 RepliesI use this type of cache code on my pages
<%@ OutputCache Duration="60" VaryByParam="*" VaryByCustom="browser" %>
An issue by example. I have a page with the asp.net 2 (MSVS 2005) membership menu controls <asp:logonview etc on them. This control show different menus depending on if the member is logged on or not. I am using forms cookie authentication. The sequence of events. Page1 has the above cache settings and a logonview menu control on it. I am not logged on. I goto Page1. I view the page, and the logonvew control shows the button to logon. So correctly it has not detected a membership cookie and shows the logon button. I log on. I go back to page1, yet the logonview has not updated the menu for the newly logon status, as the page is sourced from the cache. I have to wait 60 seconds before the page can be rendered correctly. When the page is updated for logon status, the menu button for logon does not show, it should show Welcome Member Joe Bloggs. How can all pages cache be cleared when a log on happens, so there is not cache limbo, and the logonview menu control shows the correct status always?
I'm trying to cache user controls and on some pages i want to cache single objects. There are multiple ways of implementing caching, and my head is breaking over it.
The way I see the caching options now:
You have the PartialCaching option which is set to cache the control for 30 minutes, and after that it clears itself... You have the varyByParam to identity the page by its querystring paramaters... or other vary options
But i just cant find an appropriate way to add caching to a control, and be able to clear the caching programmatically when i update one of the objects used in the control from the backend.
You can do HttpContext.Current.Cache.Insert(), which accepts a key on which you can destroy the caching item later by using remove... This can save objects in cache but can you use options like varyByParam?
My questions are burnt down to two:
Is there a way to clear the caching on specific user controls from the code? If yes, can this be done according to the varyby options? How would the object caching respond to logged in users or anonymous users using Insert()?
EDIT: I'm caching multiple things.... And I'm really flabbergasted in which choice to make referring to caching. Can the Cache.Insert be varied by Parameters?
The main problem is peopling editing things from the backend, which needs to trigger an event that reinstantiates or clears all caching items referring that object.
In my asp.net web application I would like to clear all cache upon login when I click the back button in IE. I have tried various different ways but after I click the back button and then click the forward button it goes back to the submission aspx page with the same cache values. I am using master pages as well, if this makes any difference.
View 10 RepliesIs it correct to implement my caching object like this in my controller :
[code]....
And I Use it like this :
[code]....
We have a wfc layer that wraps the business classes and database access and use a client that lives on the database layer. Amongst our group we are attempting to form standards. Some want to have the client call the web method and pass the page they are requesting and the page size. Pass that to the database and then page in SQL Server use RowNum.Some want to cache the full list of objects in http cache on the service tier and page in memory. They concern here is memory use on the server.
Which would be best for a medium number of users with potentially large number of records to manage (say 30K) Is it better to cache them all in memory and work from there or page at the database as the application scales?
What are the "optimal" parameters for creating an AppFabric cache when you will be storing session state in the cache? MSDN Cache-Related Commands
Powershell command line:
New-Cache [-CacheName] <String> [-Eviction <String>] [-Expirable <String>] [-Force [<SwitchParameter>]] [-NotificationsEnabled <String>] [-Secondaries <Int32>] [-TimeToLive <Int64>]
[code]...
Since I don't want my sessions to be removed unless the session has been abandoned either via code or Session Timeout...For eviction, I would think "None" and for expireable, I would think False.I have tested and calling Session.Abandon does remove the object from the cache. I have also tested to see if by extending my session, the session object in cache is also extended. This does seem to work the "correct" way.
We have a data driven ASP.NET website which has been written using the standard pattern for data caching (adapted here from MSDN):
public DataTable GetData()
{
string key = "DataTable";
object item = Cache[key] as DataTable;
[code]...
The trouble with this is that the call to GetDataFromSQL() is expensive and the use of the site is fairly high. So every five minutes, when the cache drops, the site becomes very 'sticky' while a lot of requests are waiting for the new data to be retrieved.
What we really want to happen is for the old data to remain current while new data is periodically reloaded in the background. (The fact that someone might therefore see data that is six minutes old isn't a big issue - the data isn't that time sensitive). This is something that I can write myself, but it would be useful to know if any alternative caching engines (I know names like Velocity, memcache) support this kind of scenario. Or am I missing some obvious trick with the standard ASP.NET data cache?
We are using HttpRuntime.Cache API in an ASP.NET to cache data retrieved from a database.
For this particular application, our database queries feature a LOT of parameters, so our cache keys look something like this:
table=table1;param1=somevalue1;param2=somevalue2;param3=somevalue3;param4=somevalue4;param5=somevalue5;param6=somevalue6... etc...
we have so many parameters that the cache key is several hundred characters long. is there a limit to the length of these cache keys? Internally, it is using a dictionary, so theoretically the lookup time should be constant. However, I wonder if we have potential to run into some performance/memory problem.
I have use Nhibernate in my MVC Project by me known, Nhibernate have cache on Session and Object. now, I want use HttpContext.Current.Cache (system.web) for cache data something in project. my code same that have problem, haven't it. and that's right or wrong.
View 2 RepliesI've got a web application that runs of a state server. It looks like soon it may need to distributed and there will be two web servers behind a load balancer.
This works great for session state but my next challenge is Cache
My application leverages heavily of cache. I understand ASP.Net 4.0 will be offering more here but nothing much has been said about the how too.
There are two challenges that I face
1). Each webserver will have its own copy of cache whereas it would be more efficient to put this to a third server the same as session state is put to state server.
2). The real challenge is keeping cache in sync if a simple dataset derived from the database is changed my code dumps that cache item and reloads the cache. That's all well on one webserver but webserver number two wont know to drop that particular cache item and reload it. This could cause some unexpected problems in the application.
For scenario number 2 I could attempt to do some smart coding so server number two knows to dump the cache and reload it.
My guess is someone else has already been here before and there's probably a better implementation approach rather than writing extra code.
Does anyone know how I could achieve the goal of keeping Cache in sync between multiple webservers or even better farm Cache management to another server?
I need to enable caching in my asp.net application, but I do not want to use the webserver's memory for holding cache objects. If I add the page directive for output caching will the page be stored in the asp.net cache object?
View 2 RepliesI want to be able to maintain certain objects between application restarts.
To do that, I want to write specific cached items out to disk in Global.asax Application_End() function and re-load them back on Application_Start().
I currently have a cache helper class, which uses the following method to return the cached value:
return HttpContext.Current.Cache[key];
Problem: during Application_End(), HttpContext.Current is null since there is no web request (it's an automated cleanup procedure) - therefore, I cannot access .Cache[] to retrieve any of the items to save to disk.
Question: how can I access the cache items during Application_End()?
Im building a image gallery which reads file from disk, create thumbnails on the fly and present them to the user. This works good, except the processing takes a bit time.
I then decided to cache the processed images using the ASP .NET Application Cache. When a image is processed I add the byte[] stream to the cache. As far as I know this is beeing saved into the system memory. And this is working perfect, the loading of the page is much faster.
My question is if there are thousands of images which gets cached in the Application Cache, will that affect the server performance in any way?
You know I have the way to Cache the data I've got from the SQL Server over data caching. In addition I can output cache web user controls.Whats about a web user control contains data from a SQL database? Does it make sense to cache the data and also cache the control?What is the best solution for the combination of these two components?
View 1 RepliesI have a server control that I developed which generates navigation based on a third party CMS API. Currently I am caching this control using the PartialCaching attribute. The CMS uses cache key dependencies to invalidate the cache when a user makes an edit, however in the case of my server control it does not get invalidated and the updated navigation will not show up until the cache expiration set by the PartialCaching attribute.Here is my two part question:
What is the proper way to programmatically cache a server control, without using the PartialCaching attribute, and adding a cache key dependency?
Is it possible to continue to use the PartialCaching attribute and add a cache key dependency?
Is it possible clear ReturnUrl from the server? I have a login page where the user logouts and I want to direct them to a specific page but when ReturnURL is set it overrides my redirect page.
Update:Ideally, I will only redirect a user who has just logged out versus someone who has bookmarked OR I will redirect regardless in special cases.So these are the cases:A link or bookmark -> should redirect to specified page in most case.A logout that has a returnurl -> should NOT redirect to the page,A special case -> should always redirect to my special case, i.e when a user needs to see something important
Is there a way to remove the returnurl from the logout/login status control?
I have an asp.net form in which i want to clear all the data what I entered in textbox,dropdownlist etc. So how can I do without going to each textbox and set the value.
like TextBox1.Text=""; etc. How can i clear all values in a form ?
The code below tries to clear the cookies for all domains once a user logs out of the system. For some reason, only the last domain in the array is cleared. Why does this happen? Am I doing something wrong?
For example, if I change the size of the array to 4 and then change the for loop to only go to 3, then it only logs me out of y.xcv.com.
As a sidenote, I have this loop working on a different server that uses a slightly different function to clear the cookies.
Edit: Code updated per suggestions below. Now it fails on the "as HttpCookie" line. Do I need to include some library?
Dim aDomain(12)
Dim ESidCookie, WIdCookie, EBidCookie, TSidAccessCookie, PSidAccessCookie, SSidCookie As HttpCookie
aDomain(0) = ".x.com"
aDomain(1) = "y.x.com"
aDomain(2) = "y.x.com" [code]....
I have a ddl that controls the visibility of a textbox (using panels). For example if i select 'Other' from the text box, a post back occurs and a text box appears beneath it for you to give further details. If any other value (for example 'dry') is selectedit's an accepted value and nothing else happens. Only problem is that if i select other, add details the text box and then go back and change the value to 'dry' (for example) the text box may dissapear but the value is still held within the box
View 3 RepliesClearing image from .asp form. I need to clear images from a form. I can clear txt boxes etc but cannot clear the images.
View 2 Replies