c# 引用变量(ref)

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int y = 1;
            IWantSideEffect(ref y);
            // 101
            Console.WriteLine(y);
        }

        static void IWantSideEffect(ref int x)
        {
            x = x + 100;
        }  
    }
}

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Student student = new Student() { Name = "LL" };

            // 46104728
            Console.WriteLine(student.GetHashCode());

            IWantSideEffect(ref student);

            // 12289376
            Console.WriteLine(student.GetHashCode());
            // Tom
            Console.WriteLine(student.Name);

        }

        static void IWantSideEffect(ref Student student)
        {
            student = new Student() { Name = "Tom" };
            //12289376
            Console.WriteLine(student.GetHashCode());
        }
    }

    class Student
    {
        public string Name { get; set; }
    }
}

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Student student = new Student() { Name = "LL" };

            // 46104728
            Console.WriteLine(student.GetHashCode());

            IWantSideEffect(ref student);

            // 46104728
            Console.WriteLine(student.GetHashCode());
            // Tom
            Console.WriteLine(student.Name);

        }

        static void IWantSideEffect(ref Student student)
        {
            student.Name = "Tom";
            // 46104728
            Console.WriteLine(student.GetHashCode());
        }
    }

    class Student
    {
        public string Name { get; set; }
    }
}

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Student student = new Student() { Name = "LL" };

            // 46104728
            Console.WriteLine(student.GetHashCode());

            IWantSideEffect(student);

            // 46104728
            Console.WriteLine(student.GetHashCode());
            // Tom
            Console.WriteLine(student.Name);

        }

        static void IWantSideEffect(Student student)
        {
            student.Name = "Tom";
            // 46104728
            Console.WriteLine(student.GetHashCode());
        }
    }

    class Student
    {
        public string Name { get; set; }
    }
}