类成员支持五种访问修饰 |
|
访问不受限制 | public(公共的) |
访问范围限定于它所属的类或从该类派生的类型 | protected (保护的) |
访问范围限定于此程序 | internal(内部的) |
访问范围限定于此程序或那些由它所属的类派生的类型 | protected internal(内部保护的) |
访问范围限定于它所属的类型 | private(私有的) |
注意:上面这些修饰都是对类而言的,以上的访问修饰符描述的对类内部成员的访问可见修饰。
publc所修饰值是完全公开的,不管是子类还是同程序集(代码可见范围)都是可以访问的。
protected所修饰值除了类本身,子类也可以访问
internal所修饰值除了类本身,同程序集(代码可见范围)都是可以访问的。
protected internal所修饰值除了类本身,子类或同程序集(代码可见范围)都是可以访问的。
private所修饰值除了类本身,都不可以访问。
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第一笔钱,大家都可以用,狐朋狗友阿,亲属阿,老婆孩子啊,所需花费都可以用这笔钱。
第二笔钱,给你孩子留得,将来的教育基金阿,嫁妆娶老婆啊,等等
第三笔钱,给你的亲属的,父母,岳父岳母,亲戚,老婆等等
第四笔钱,使家族基金,家族中不管老幼还是你孩子或是你的私生子都可用。
最后一笔钱,是你的私房钱,连老婆都不可以晓得。
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public class Space
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{
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public static void Main(string[] args)
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{
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//错误CostPrice不可以访问
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System.Console.WriteLine(new SalesContract().CostPrice);
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//在代码可以同见范围内,PreferentialPrice可以访问
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System.Console.WriteLine(new SalesContract().PreferentialPrice);
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}
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}
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public class Contract//合同
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{
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public string Buyer;//买方
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public string Seller;//卖方
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protected double CostPrice;//成本价(只有子类和自身可以访问)
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}
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public class SalesContract : Contract//销售合同
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{
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private double MinimumPrice;//最低价
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public double SalePrice;//销售价格
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public bool CheckPrice()//价格检查
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{
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//CostPrice在本类不必声明,基类已经声明了
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return SalePrice < Math.Min(MinimumPrice, CostPrice);
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}
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internal double PreferentialPrice;//优惠价
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}
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