欄位儲存著一個值型別的例項或者一個指向引用型別的引用。欄位的宣告格式

欄位修飾符 欄位型別 欄位名

修飾符有：new public  protected  internal， private， static

靜態欄位是屬於類的，通過類名來訪問，例項欄位是屬於物件的，通過物件來訪問。

來個栗子==============================================

執行之後發現number 分別為1,2，但是count都是2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace field
{
    class Program
    {
        class Person
        {
            public static int count = 0;//宣告靜態欄位
            public string name;//一個例項欄位
            public int number;
            public Person(string name)
            {
                this.name = name;
                count++;
                number = count;
            }
        }
        static void Main(string[] args)
        {
            Person personA = new Person("baby");//建立物件引用，例項化物件
            Person personB = new Person("Jack");
            Console.Write("第{0}個例項： number = {0}\t", personA.number);
            Console.Write("count = {0}\t", Person.count);
            Console.WriteLine("name = {0}", personA.name);

            Console.Write("第{0}個例項： number = {0}\t", personB.number);
            Console.Write("count = {0}\t", Person.count);
            Console.WriteLine("name = {0}", personB.name);
        }
    }
}