Use MemberwiseEqualityComparer as external comparer

[xmedeko]

I use MemberwiseEqualityComparer for an external class, which I cannot change the code. It works great. However, I need to ommit a certain property, but I cannot add [MemberwiseEqualityIgnore] attribute to the external class code.

[ruler501]

Could maybe add a way to pass in a custom filter function that could filter out unwanted properties from classes you can't add annotations to? If you can think of a decent interface I can try implementing it on my fork when I have time.

[thedmi]

You should be able to use MemberwiseEqualityComparer<T>.Custom(), see https://github.com/thedmi/Equ/blob/master/Sources/Equ/MemberwiseEqualityComparer.cs#L49. This factory method takes an EqualityFunctionGenerator. That class can be configured with selector functions (see constructor). You can use the selector functions to include/exclude properties, so for your case you could e.g. filter based on the property name.