Unity C# const与static readonly的区别与联系

 using System;

 namespace Test
 {
     class MainClass
     {
         //懒人写法的单例
         class Weapon
         {
             public static readonly Weapon Instance;
             static Weapon()
             {
                 Instance=new Weapon();
             }
         }
         class MyWeapon
         {
             //static readonly和const的区别
             public const int Speed=;//const必须赋值，且只能用这种方法赋值
             //static readonly 可以赋值也可以不赋值，也可以在用static修饰的构造方法中赋值
             public static readonly int Speed_1;
             public static readonly int Speed_2=;
             public static readonly int Speed_3;
             static MyWeapon()
             {
                 Speed_3=;
             }
         }

         public static void Main (string[] args)
         {
             //static readonly和const的联系，
             //在外边只能通过类名.访问，且在外部不能赋值（二者都是只读的）
             Console.WriteLine (MyWeapon.Speed_3);//
         }
     }
 }