CODEWITHSUNDEEP
javac#wildcard
Vlad Kisly
Vlad Kisly

Reputation: 360

"java wildcard" to C#?

How do I convert this "java wildcards" to C# format? 

public abstract class AAA<T extends BBB<?>> extends CCC<T>{}

My incorrect C# code

public abstract class AAA<T> : CCC<T> where T : BBB<?>{}

How do I convert BBB<?>

Upvotes: 3

Views: 162

Answers (2)

Arkaine55
Arkaine55

Reputation: 548

There is a similar question C# generic "where constraint" with "any generic type" definition? not specific to Java wildcards. The answer provided there will likely help you.

From that answer, a possible class signature would be:

public abstract class AAA<T, TOther> : CCC<T>
    where T : BBB<TOther>
{}

Generics in C# must have named type parameters even if you never plan to use the type explicitly/implicitly. And all type parameters must be named in the identifier declaration of the method/class/interface.

Note that it would be possible to constrain TOther to just object types if so desired using:

public abstract class AAA<T, TOther> : CCC<T>
    where T : BBB<TOther>
    where TOther : object
{}

Upvotes: 1

ZhongYu
ZhongYu

Reputation: 19682

What is BBB exactly?

I bet that BBB<Object> probably would work; BBB is likely a covariant type.

Upvotes: 0

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