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Well, you learn something new everyday and today I found out that you can’t have a partial class that spans across projects in C#, i.e. if I have a partial class called MyClass in ProjectA:
I won’t be able to extend it by defining another partial class called MyClass in ProjectB even if I put the new partial class under the same namespace. Now, that’s a bummer.. but when you think about it it actually makes perfect sense!
If partial class across projects were to be allowed, it would represent a huge security risk because it’d allow potentially harmful code to be injected into existing binaries. Imagine if I had a partial class with private methods that I don’t want to expose:
I kept these methods private so others can call them, so then I compile, build and distribute the binaries, and all of a sudden some evil-doer is able to extend my class and do this:
Now that’s no good! OK.. if someone really wants to execute the DoSecretHandshake method, they can always use reflection to do it, but at least it won’t be so easy and indeed tempting for them to try it..
Oh, and one more thing, a partial class is a compile time only piece of syntactic sugar and the whole thing is still compiled into a single type, in a single project. It does however, allow you to separate a huge class file into multiple files and hence making it easier to organise and manage.
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Check out my new course, Learn you some Lambda best practice for great good! In this course, you will learn best practices for working with AWS Lambda in terms of performance, cost, security, scalability, resilience and observability. We will also cover latest features from re:Invent 2019 such as Provisioned Concurrency and Lambda Destinations. Enrol now and start learning!
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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 wrong about serverless and vendor lock-in
- You are thinking about serverless costs all wrong
- Just how expensive is the full AWS SDK?
- Many faced threats to Serverless security
- We can do better than percentile latencies
- 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
- Top 10 Serverless framework best practices