Use Method Parameters with Dynamic Type in C#

Run Application

using System;
using System.Collections.Generic;
using System.Dynamic;

namespace LearnAdvancedCSharpWithRealApps
{
	class Program
	{
		static void Main(string[] args)
		{
			Console.WriteLine("Demo 1");
			Console.WriteLine("Add: " + Add(1, 2));

			Console.WriteLine("\nDemo 2");
			foreach(dynamic name in FindAll1())
			{
				Console.WriteLine(name);
			}

			Console.WriteLine("\nDemo 3");
			foreach (dynamic name in FindAll2())
			{
				Console.WriteLine(name);
			}

			Console.WriteLine("\nDemo 4");
			Print(Find());

			Console.ReadLine();
		}

		static dynamic Add(dynamic number1, double number2)
		{
			return number1 + number2;
		}

		static dynamic FindAll1()
		{
			return new List<dynamic> { 
				"Name 1", "Name 2", "Name 3", "Name 4"
			};
		}

		static dynamic FindAll2()
		{
			return new dynamic[] {
				"Name 1", "Name 2", "Name 3", "Name 4"
			};
		}

		static dynamic Find()
		{
			dynamic student = new ExpandoObject();
			student.Id = "st0";
			student.Name = "Name 1";
			student.Age = 20;
			student.Score = 5.6;
			student.Status = true;
			student.Birthday = DateTime.Now;
			student.Address = new ExpandoObject();
			student.Address.Street = "Street 1";
			student.Address.Ward = "Ward 1";
			student.Address.District = "District 1";
			dynamic course1 = new ExpandoObject();
			course1.Id = "c1";
			course1.Name = "Course 1";
			dynamic course2 = new ExpandoObject();
			course2.Id = "c2";
			course2.Name = "Course 2";
			dynamic course3 = new ExpandoObject();
			course3.Id = "c3";
			course3.Name = "Course 3";
			student.Courses = new List<dynamic> {
				course1, course2, course3
			};
			return student;
		}

		static void Print(dynamic student)
		{
			Console.WriteLine("Student Info");
			Console.WriteLine("id: " + student.Id);
			Console.WriteLine("name: " + student.Name);
			Console.WriteLine("age: " + student.Age);
			Console.WriteLine("score: " + student.Score);
			Console.WriteLine("status: " + student.Status);
			Console.WriteLine("birthday: " + student.Birthday.ToString("dd/MM/yyyy"));
			Console.WriteLine("Address: ");
			Console.WriteLine("\tstreet: " + student.Address.Street);
			Console.WriteLine("\tward: " + student.Address.Ward);
			Console.WriteLine("\tdistrict: " + student.Address.District);
			Console.WriteLine("Courses: ");
			foreach (dynamic course in student.Courses)
			{
				Console.WriteLine("\tcourse id: " + course.Id);
				Console.WriteLine("\tcourse name: " + course.Name);
				Console.WriteLine("\t----------------------");
			}
		}
	}
}							

Output

Demo 1
Add: 3

Demo 2
Name 1
Name 2
Name 3
Name 4

Demo 3
Name 1
Name 2
Name 3
Name 4

Demo 4
Student Info
id: st0
name: Name 1
age: 20
score: 5.6
status: True
birthday: 11/10/2021
Address:
		street: Street 1
		ward: Ward 1
		district: District 1
Courses:
		course id: c1
		course name: Course 1
		----------------------
		course id: c2
		course name: Course 2
		----------------------
		course id: c3
		course name: Course 3
		----------------------