WCF / ASMX :: Singleton Class Variables Being Reset
Jul 22, 2010
I have set the instanceContextMode to single to create a singleton class.I use the join to add a user to the list, and getuserlist() to retrieve the users. I added a service reference opened two browsers , made sure i simulated it such that i am adding two seperate users , and display the users returned by getuserlist. But its always displaying only one user , the current user. I also have a counter
private static int counter = 1
public int returnCounter()
{
return counter++;
}
This is returning incremented values when i open it in different browsers , but the list is always getting overritten. I am running this as a managed windows service, wsHttpBinding , and my client is a website accessing this service.
I have some confusion with singleton class, below are my some points:
1.Can singleton class have static method?,if yes then how we call that methods? 2.what is main difference between Static class and Singleton Class?
I have created my singleton class as follows:
[Code]....
In Above class structure I have created two method one is Static and second is non static, When I am trying to access Static Method it gives me compile time error.
I know what Singleton Pattern means and Abstract class means.What I wanted to know was how would this apply to real world.Could anyone give me any good example or simple explanation.Say I have a simple website, why would I use any of the above if any.Why would it simplify my architechture.
I have an ASP.NET 4.0 site that I expect to come under extremely high volumes in the next month or so and I am attempting to maximize performance. The site is divided into the front end UI pages, as was as a business and data layer. My thought was to pull the business and data layer out and wrap them in a NamedPipes Connected Windows Service running in Singleton mode.
I created the windows service, got the connection setup correctly and now I am wondering if this is just asking for trouble. Is this a good idea or should I just leave the Business/Data layers in the main solution and let IIS spin those objects up and down for each request? In essence I was thinking that using a WCF Windows Service as an Application Server would be more efficient but that is just a theory
Suppose we declare and define the variable in one class let say FirstClass and we want to use that variable in another class let say SecondClass which is outside of FirstClass .how to do this?
I have some code in my page load event where I just want to fire once when the user opens the Browser. The only issue is if you open a new tab with the same website the session variable does not reset. Is there a way to reset the session variable when you open a new tab or do you have to take the whole web browser down for it to clear the session variable.
In my ASP.net website we are going to use Silverlight to display some interactive diagrams. The users can add, edit and delete various diagrams on the silverlight front end. Silverlight will call Web Service methods to save the changes into the database. Besides the data being passed by silverlight to web service call, we also need to pass some data from the session (like logged on user id etc.) to the web service call.
My question is that how silverlight can access session data? I am trying to pass session information via a webservice method call over to Silverlight but, the session variables inside the web service methods are returning null value.
The Web Service is running under the same web root where the ASP.net website using Silverlight is also hosted. I have made EnableSession = True for web properties.
One small doubt in the way it works for C#Where does local variables of a method inside a class get stored?Heap? - If yes, then why do we have to explicitly initiate them?Stack?- Then how does the allocation of them takes place once we make a object of the same class using new - would it make the member variables of class to be allocated on heap and local variables of member functions (of the same class) on stack.
I have no problem accessing these variables form .ascx.cs or .aspx.cs file -- ie. files that are part of the Web content. However, I can't seem to access 'Application' from basic class objects (ie. standalone .cs files). I read somewhere to use a slight variations in .cs files, as follows, but it always comes throws an exception when in use:
In page behind classes I am using a private and shared object (list<client> or just client) to temporary hold data coming from database or class library. This object is used temporarily to catch data and than to return, pass to some function or binding acontrol. 1st: Can this approach harm any way ? I couldnt analyse it but a thought was using such shared variables may replace data in it ?2nd: Please comment also on using such variables in BLL (to hold data coming from database) where new object of BLL class will be made everytime.
In page behind classes I am using a private and shared object and variables (list or just client or simplay int id) to temporary hold data coming from database or class library. This object is used temporarily to catch data and than to return, pass to some function or binding a control.1st: Can this approach harm any way ? I couldn't analyze it but a thought was using such shared variables may replace data in it when multiple users may be sending request at a time?
I have some code I only want to execute the first time I display a form. With this in mind I created a class variable which I initialize the first time I execute page load.
public partial class CLVideoDefinition : System.Web.UI.Page { string videofile; string first; protected void Page_Load(object sender, EventArgs e) { if (first != "N") {
I then select a value from a drop down list , but when it does the auto postback it executes page load but my class varaible has been reinitialized to null and will then execute the code I only want to execute on the first run. why my class variable has been reinitialized.
When I do server side soap service programming, I create proxy classes first using some xsd schemas.
Xsd schemas are already defined by another company.my problem is these schemas have master xsds and child xsds which means on master xsds there are references to child xsds.
In this case I have 2 different questions.
1) Is it possible to use xsd schemas directly to build soap service without generating proxy classes.
2) If it is not possible, I am using vs command prompt by typing xsd /c /l:vb nameofmasterfile.xsd
but while there references to child xsds, I am getting an error msg. thats why I had to flatten these xsds in the past. Is it possible to generate all classes in one shot. any external program also ok.
If i want to use Property & Method in same class then how to use it. I want to keep separate class only for interface , not for property. Also we have tried with [OperationContract] before get ,set in Service class . it solved our issue but throws error while run a .svc file
i wrote a webmethod on webservice. it will do adding product to shoppingbasket. But it doesn't work. i used a class and its method in this webservice method. error is about it. my code are below:
I've created a class library, now I'm trying to use it in a webservice.If I try and use it via a web method like this:
<WebMethod()> _Public Function GetStaffList() As List(Of ClassLibrary.Staff) End Function
I get this error:You must implement a default accessor on System.Security.Policy.Evidence because it inherits from ICollection. And I can't seem to find any coherent instructions on remedying this issue.If I copy the Staff class into the web service (app_code) it works hunky dory, so it must be security..I can't be the only one attempting this! MSDN doesn't explain this one too well :(
