C# Builder

次のようになります.

class Program

{

    static void Main(string[] args)

    {

        var a = new Class1.Builder().BuildA(1).BuildB(2.1).BuildUp();

        Console.Read();

    }

}

public class Class1

{

    private Class1(Builder builder)

    {

        A = builder.A;

        B = builder.B;

    }

    internal int A { get; set; }

    internal double B { get; set; }



    public class Builder

    {

        internal int A { get; set; }

        internal double B { get; set; }

        public Builder BuildA(int a)

        {

            A = a;

            return this;

        }

        public Builder BuildB(double b)

        {

            B = b;

            return this;

        }

        public Class1 BuildUp()

        {

            return new Class1(this);

        }

    }

}