Is there a reasonable approach to “default” type parameters in C# Generics?

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Subclassing is the best option.

I would subclass your main generic class:

class BaseGeneric<T,U>

with a specific class

class MyGeneric<T> : BaseGeneric<T, string>

This makes it easy to keep your logic in one place (the base class), but also easy to provide both usage options. Depending on the class, there is probably very little extra work needed to make this happen.

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