A custom Fody weaver marking all non-virtual(abstract, non-sealed) types as sealed by default.
Inspired by an excellent series of posts by Joe Duffy - http://joeduffyblog.com/2015/11/03/blogging-about-midori/
As per Jeffrey Richter(http://codebetter.com/patricksmacchia/2008/01/05/rambling-on-the-sealed-keyword/) - why you want to mark all your classes as 'sealed' by default:
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Versioning: When a class is originally sealed, it can change to unsealed in the future without breaking compatibility. (…)
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Performance: (…) if the JIT compiler sees a call to a virtual method using a sealed types, the JIT compiler can produce more efficient code by calling the method non-virtually.(…)
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Security and Predictability: A class must protect its own state and not allow itself to ever become corrupted. When a class is unsealed, a derived class can access and manipulate the base class’s state if any data fields or methods that internally manipulate fields are accessible and not private.(…)
Install-Package Seal.Fody
Usage is super simple, just add new weaver to FodyWeavers.xml(if you install package from NuGet it will be done automatically).
Additionally you can use [LeaveUnsealed] attribute to prevent Seal from marking type as sealed:
[LeaveUnsealed]
public class DontSealMe
{
}