Rebinding and singleton-behaviour [NInject]
- by Maximilian Csuk
Hi!
I have set up a NInject (using version 1.5) binding like this:
Bind<ISessionFactory>().ToMethod<ISessionFactory>(ctx =>
{
try
{
// create session factory, might fail because of database issues like wrong connection string
}
catch (Exception e)
{
throw new DatabaseException(e);
}
}).Using<SingletonBehavior>();
As you can see, this binding uses a singleton behavior but can also throw exception when something is not configured correctly, like a wrong connection string to the database.
Now, when the creation of a session factory fails at first (throwing a database exception), NInject doesn't try to create the object again but always returns null.
I would need NInject to check for null first and recreate when the instance is null, but of course not when there already is an instance successfully constructed (keeping it singleton). Like this:
var a = Kernel.Get<ISessionFactory>(); // might fail, a = null
// ... change some database settings
var b = Kernel.Get<ISessionFactory>(); // might not fail anymore, b = ISessionFactory object
Would I need to write a custom behavior or am I missing something else?
Thanks for your answers!
