类的静态(Static)成员——字段

定义一个雇员类：

namespace StaticFieldTest1
{
    class Employee
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Salary { get; set; }

        //
        public static int NextId;
        public Employee(string firstName, string lastName)
        {
            FirstName = firstName;
            LastName = lastName;
            Id = NextId;
            NextId++;
        }
    }
}

使用雇员类：

using System;

namespace StaticFieldTest1
{
    class Program
    {
        static void Main(string[] args)
        {
            Employee.NextId = 100000;

            Employee employee1 = new Employee("Inigo", "Montoya");
            Employee employee2 = new Employee("Princess", "Buttercup");

            Console.WriteLine("{0} {1} ({2})", employee1.FirstName, employee1.LastName, employee1.Id);
            Console.WriteLine("{1} {1} ({2})", employee2.FirstName, employee2.LastName, employee2.Id);

            Console.WriteLine("NextId = {0}", Employee.NextId);
            Console.ReadKey();

        }
    }
}

输出：

Inigo Montoya (100000)
Buttercup Buttercup (100001)
NextId = 100002