c# - Are interfaces data types? -

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i viewing tuts+ video titled design patterns in c#. in it, instructor says:

"interfaces contracts. they data types define properties , methods have implement within class."

my question: correct, is, interfaces data types in c#?

from the c# programming guide:

c# strongly-typed language. every variable , constant has type, every expression evaluates value. every method signature specifies type each input parameter , return value.

(...)

you use struct, class, interface, , enum constructs create own custom types.

so yes, interfaces considered first class types in .net world. anyway find term "data type" confusing in context, think saying "type" more correct.


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