Performing action before WCF service is shutdown

问题

I have a WCF service hosted in IIS7. The service has a static class with a static list containing strings (sort of log). It periodically write the entries to a file or db.

However when the IIS decides the recyle the app or terminate for whatever reason, the entries in the static field are lost.

Is there any way I can handle the service shuttingdown kind event and persist the data from memory?

Thanks

Shreedhar

回答1:

I've implemented several services via IIS with a custom service host (originally I did this so I could implement IErrorHandler for global error handling).

You'll need two things - an implementation of ServiceHost and an implementation of ServiceHostFactory, which will call your custom service host. For example (just the relevant parts of code shown):

public class MyCustomServiceHost : ServiceHost
{

    protected override void OnClosing()
    {

        // logic to save off your static data
        base.OnClosing();
    }
}

public class MyCustomServiceHostFactory : ServiceHostFactory
{

    protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
    {

        return new MyCustomServiceHost(serviceType, baseAddresses);
    }
}

In your .svc file, you'd have something like this:

<%@ ServiceHost Service="MyCompany.MyServiceName" Factory="MyCompany.MyCustomServiceHostFactory" %>
<%@ Assembly Name="MyCustomServiceHost" %>

This is one way to do this (and this dates back to .NET 3.5 days); there are quite likely other ways to accomplish this, but at least this should give you some direction.

来源：https://stackoverflow.com/questions/11769673/performing-action-before-wcf-service-is-shutdown

标签

wcf