ConstructorDeclaration Class

var cls = new ClassDeclaration("Person");
var ctor = cls.AddMember(new ConstructorDeclaration());
ctor.Modifiers = Modifiers.Public;
ctor.Arguments.Add(new MethodArgumentDeclaration(typeof(string), "name"));
ctor.Statements = new AssignStatement(new MemberReferenceExpression(new ThisExpression(), "_name"), new ArgumentReferenceExpression("name"));

Assert.Equal("""
    class Person
    {
        public Person(string name)
        {
            this._name = name;
        }
    }

    """, cls.ToCsharpString());