It's been some time, but this is continuing my previous posts about .NET IoC.
As I'm familiar with Spring from the Java world, I thought I'd transfer that knowledge across to .NET. It turned out to be less painful than I expected.
I was building a service-based project and used spring on both the client and server sides of the divide. For this post, I'll initially stick to it's use on the client side, but server-side has a very similar set-up. Maybe I'll come to full WCF integration later on.
For basic IoC you just need the Spring.Core.dll from the distribution - add this as a reference to your project.
Initially I'm following the KISS principle, so I created a basic application context file - spring.config.xml and put that at the top level of my project.
Basic format is as follows:
<?xml version="1.0" encoding="utf-8" ?>
type="<Assembly name>.namespace.classname1, <assembly name>" singleton="false">
<property name="Property1" ref="Object2" /
type="<Assembly name>.namespace.classname2, <assembly name>" singleton="false">
singleton="false"will ensure that Spring gives you a new instance every time you request the particular object.
As a minimum in your code, you'll need to create an application context somewhere.
I've put it in a singleton Locator class as follows:
private static IApplicationContext _context = null;
_context = new XmlApplicationContext("spring-config.xml");
where spring-config.xml is the name of your config file. This is sitting at the top-level of the project.
Then you'll want a method to grab hold of an object instance as follows:
public object getObjectInstance(string name)
or, if you need to pass arguments in to the constructor...
public object getObjectInstance(string name, object args)
return _context.GetObject(name, args);
In both cases "name" is the object's ID in the configuration file.
Passing arguments in like this is "OK", but can be a pain, since there's no compile time checking - but we're staying simple.
At some point you could call:
- create an instance of Object1
- create an instance of Object2
- set Property1 on Object1 to be Object2
- return you a "ready-to-go" instance of Object1.
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