Is it possible to define a constructor in an interface in a programming language?

In C# language, an interface cannot contain constructors. An interface only defines method signatures, properties, events, and indexers, but does not implement logic or contain constructors.

Constructors are special methods that create instances of classes or structs. Since an interface cannot be instantiated directly, constructors are not defined within it.

If you need to specify requirements for constructors, this can be done through abstract classes or by using factory methods.

Example:

interface IMyInterface
{
    void DoWork();
}

class MyClass : IMyInterface
{
    public MyClass(int param) { /* constructor */ }
    public void DoWork() { /* implementation */ }
}