All 17 Generics questions
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How does generic type inference work when calling a generic method, and when do you need to specify the type argument explicitly? What is covariance ('out T') and contravariance ('in T') in generic interfaces, and how does IEnumerable<out T> demonstrate covariance? What are generics in C#, and what specific problems do they solve compared to writing type-specific code? How are generics implemented for value types vs reference types in the CLR? How would you implement a generic method with MULTIPLE type parameters and constraints that reference EACH OTHER, like a generic mapping function? How do generic type parameters interact with static members, and why does each closed generic type get its OWN independent set of static field values? How would you implement a generic, reusable object pool using generic constraints to ensure poolable objects can be properly reset? How do generic attributes (introduced in C# 11) work, and what limitation did they finally remove compared to older attribute usage patterns? How would you implement generic operator constraints using .NET's generic math interfaces (like INumber<T>) to write a single Sum<T>() method working across int, double, and decimal?
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C# › Generics

What problem do generic math / static abstract interface members solve?

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They let you write algorithms over any numeric type by constraining to interfaces like INumber<T> with static abstract operators, removing duplicated overloads.
T Sum<T>(IEnumerable<T> xs) where T : INumber<T> {
    T total = T.Zero; foreach (var x in xs) total += x; return total; }
Real-world example One Sum method that works for int, double and decimal alike.
All 17 Generics questions