Does an abstract class have a constructor in C#?

Yes, an abstract class in C# can have a constructor.

An abstract class can define constructors just like any other class. These constructors can be used to initialize fields or perform other necessary setup tasks. However, you cannot directly instantiate an abstract class using the new keyword, because it is meant to be a blueprint for other classes to inherit from.

The constructors of an abstract class are primarily used to initialize the state of the abstract class itself or to initialize common fields that may be inherited by derived classes. When a derived class is instantiated, its constructor can call the constructor of the abstract class using the base keyword.

Example demonstrating the use of a constructor in an abstract class:

abstract class Animal
{
    public string Name { get; set; }

    // Constructor of the abstract class
    public Animal(string name)
    {
        Name = name;
    }

    // Abstract method
    public abstract void MakeSound();
}

class Dog : Animal
{
    public Dog(string name) : base(name)
    {
    }

    public override void MakeSound()
    {
        Console.WriteLine("Woof!");
    }
}

class Program
{
    static void Main(string[] args)
    {
        Dog dog = new Dog("Buddy");
        Console.WriteLine("Dog's name: " + dog.Name);
        dog.MakeSound();
    }
}

In this example, the Animal class is an abstract class with a constructor that initializes the Name property. The Dog class inherits from the Animal class and calls its constructor using base(name) within its own constructor.