C# 属性如何继承？
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How does inheritance work for Attributes?
提问by devoured elysium
What does the Inheritedbool property on attributes refers to?
Inherited属性上的bool 属性指的是什么？
Does it mean that if I define my class with an attribute AbcAtribute(that has Inherited = true), and if I inherit another class from that class, that the derived class will also have that same attribute applied to it?
这是否意味着如果我使用属性AbcAtribute（具有Inherited = true）定义我的类，并且如果我从该类继承另一个类，那么派生类也将应用相同的属性？
To clarify this question with a code example, imagine the following:
为了用代码示例澄清这个问题，请想象以下内容：
[AttributeUsage(AttributeTargets.Class, Inherited = true)]
public class Random: Attribute
{ /* attribute logic here */ }
[Random]
class Mother
{ }
class Child : Mother
{ }
Does Childalso have the Randomattribute applied to it?
是否Child也Random应用了该属性？
采纳答案by cmdematos.com
When Inherited = true (which is the default) it means that the attribute you are creating can be inherited by sub-classes of the class decorated by the attribute.
当 Inherited = true （这是默认值）时，这意味着您正在创建的属性可以被该属性修饰的类的子类继承。
So - if you create MyUberAttribute with [AttributeUsage (Inherited = true)]
所以 - 如果你用 [AttributeUsage (Inherited = true)] 创建 MyUberAttribute
[AttributeUsage (Inherited = True)]
MyUberAttribute : Attribute
{
string _SpecialName;
public string SpecialName
{
get { return _SpecialName; }
set { _SpecialName = value; }
}
}
Then use the Attribute by decorating a super-class...
然后通过装饰一个超类来使用该属性...
[MyUberAttribute(SpecialName = "Bob")]
class MySuperClass
{
public void DoInterestingStuf () { ... }
}
If we create an sub-class of MySuperClass it will have this attribute...
如果我们创建 MySuperClass 的子类，它将具有此属性...
class MySubClass : MySuperClass
{
...
}
Then instantiate an instance of MySubClass...
然后实例化 MySubClass 的一个实例...
MySubClass MySubClassInstance = new MySubClass();
Then test to see if it has the attribute...
然后测试它是否具有该属性...
MySubClassInstance <--- now has the MyUberAttribute with "Bob" as the SpecialName value.
MySubClassInstance <--- 现在具有 MyUberAttribute，其中“Bob”作为 SpecialName 值。
回答by ShuggyCoUk
Yes that is precisely what it means. Attribute
是的，这正是它的意思。属性
[AttributeUsage(Inherited=true)]
public class FooAttribute : System.Attribute
{
private string name;
public FooAttribute(string name)
{
this.name = name;
}
public override string ToString() { return this.name; }
}
[Foo("hello")]
public class BaseClass {}
public class SubClass : BaseClass {}
// outputs "hello"
Console.WriteLine(typeof(SubClass).GetCustomAttributes(true).First());
回答by Kolob Canyon
Attribute inheritance is enabled by default.
默认情况下启用属性继承。
You can change this behavior by:
您可以通过以下方式更改此行为：
[AttributeUsage (Inherited = False)]
