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It’s been a while since I had to create a config section handler and my god did I forget how cumbersome a process it is!
Instead of doing all these work to make a bespoke config section handler every time you want to parse some data out of the app.config file, wouldn’t it be nice to have a more generic, reusable component to do all the work for you? Well, turns out it wasn’t all that hard to make one either!
Broadly speaking, you usually want to parse either an object, or a collection of objects out of the config file, and they required slightly different handling so I ended up writing one for each.
The single object case is fairly easy, all you need is an XmlSerializer for deserializing the XML node:
Assuming you have a simple class like this:
To parse it out of your app.config file, you need something like this in the config file:
And your code will be the same as before:
Collections usually represent a whole new level of pain because to get an array of objects out of the config file you have to first create a wrapper object to hold the array. You then need to set up your config section to parse the wrapper object instead of the array itself, just an additional hoop you have to jump through to get something simple done…
Well, with this GenericCollectionConfigSectionHandler class hopefully you won’t ever have to do that again!
As you can see, this class is pretty simple, to use it your config file ought to look a little like this:
So you see, no wrapper class required and you get an array of MyClass instances back:
I specialise in rapidly transitioning teams to serverless and building production-ready services on AWS.
Are you struggling with serverless or need guidance on best practices? Do you want someone to review your architecture and help you avoid costly mistakes down the line? Whatever the case, I’m here to help.
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Here is a complete list of all my posts on serverless and AWS Lambda. In the meantime, here are a few of my most popular blog posts.
- Lambda optimization tip – enable HTTP keep-alive
- You are thinking about serverless costs all wrong
- Many faced threats to Serverless security
- We can do better than percentile latencies
- I’m afraid you’re thinking about AWS Lambda cold starts all wrong
- Yubl’s road to Serverless
- AWS Lambda – should you have few monolithic functions or many single-purposed functions?
- AWS Lambda – compare coldstart time with different languages, memory and code sizes
- Guys, we’re doing pagination wrong