AttributeUsageAttribute.Inherited 属性

定义

获取或设置 Boolean 值,该值确定指示的属性是否由派生类和重写成员继承。Gets or sets a Boolean value that determines whether the indicated attribute is inherited by derived classes and overriding members.

public:
 property bool Inherited { bool get(); void set(bool value); };
public bool Inherited { get; set; }
member this.Inherited : bool with get, set
Public Property Inherited As Boolean

属性值

Boolean

如果该属性可以由派生类和重写成员继承,则为 true;否则为 falsetrue if the attribute can be inherited by derived classes and overriding members; otherwise, false. 默认值为 trueThe default is true.

示例

下面的示例说明了属性值为的特性应用于的特性与 AttributeUsageAttribute Inherited 应用了 trueAttributeUsageAttribute Inherited 属性值的 false 特性之间的差异。The following example illustrates the difference between an attribute to which an AttributeUsageAttribute attribute with an Inherited property value of true is applied and one to which AttributeUsageAttribute attribute with an Inherited property value of false is applied. 此示例定义了两个属性: InheritedAttributeNotInheritedAttributeThe example defines two attributes, InheritedAttribute and NotInheritedAttribute. 这两个特性可应用于类和方法。Both attributes can apply to classes and methods. 由于应用于的 Inherited 特性的属性 AttributeUsageAttribute InheritedAttribute 为,因此 true 它由派生类和重写基类方法的派生类的成员继承。Because the Inherited property of the AttributeUsageAttribute attribute applied to InheritedAttribute is true, it is inherited by derived classes and the members of derived classes that override the base class method. 另一方面,因为应用于的属性的 Inherited 属性 AttributeUsageAttribute NotInheritedAttributefalse ,所以它不会由派生类和重写基类方法的派生类的成员继承。On the other hand, because the Inherited property of the AttributeUsageAttribute attribute applied to NotInheritedAttribute is false, it is not inherited by derived classes and the members of derived classes that override the base class method.

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method |
                AttributeTargets.Property | AttributeTargets.Field,
                Inherited = true)]
public class InheritedAttribute : Attribute
{ }

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method |
                AttributeTargets.Property | AttributeTargets.Field,
                Inherited = false)]
public class NotInheritedAttribute : Attribute
{ }
<AttributeUsage(AttributeTargets.Class Or AttributeTargets.Method _
                Or AttributeTargets.Property Or AttributeTargets.Field,
                Inherited:=True)>
Public Class InheritedAttribute : Inherits Attribute
End Class

<AttributeUsage(AttributeTargets.Class Or AttributeTargets.Method _
                Or AttributeTargets.Property Or AttributeTargets.Field,
                Inherited:=False)>
Public Class NotInheritedAttribute : Inherits Attribute
End Class

然后,该示例定义两个基类。The example then defines two base classes. 第一 BaseA 种是,有一个方法 MethodAThe first, BaseA, has a single method, MethodA. 第二个 BaseB 是,有一个方法 MethodBThe second, BaseB, has a single method, MethodB. BaseAMethodA 是用特性标记的 InheritedAttribute ,并且 BaseBMethodB 是用特性标记的 NotInheritedAttributeBaseA and MethodA are tagged with the InheritedAttribute attribute, and BaseB and MethodB are tagged with the NotInheritedAttribute attribute. DerivedA 继承自 BaseA 并重写其 MethodA 方法。DerivedA inherits from BaseA and overrides its MethodA method. DerivedB 继承自 BaseB 并重写其 MethodB 方法。DerivedB inherits from BaseB and overrides its MethodB method.

using System;
using System.Reflection;

[InheritedAttribute]
public class BaseA
{
    [InheritedAttribute]
    public virtual void MethodA()
    { }
}

public class DerivedA : BaseA
{
    public override void MethodA()
    { }
}

[NotInheritedAttribute]
public class BaseB
{
    [NotInheritedAttribute]
    public virtual void MethodB()
    { }
}

public class DerivedB : BaseB
{
    public override void MethodB()
    { }
}

public class Example
{
    public static void Main()
    {
        Type typeA = typeof(DerivedA);
        Console.WriteLine($"DerivedA has Inherited attribute: {typeA.GetCustomAttributes(typeof(InheritedAttribute), true).Length > 0}");
        MethodInfo memberA = typeA.GetMethod(nameof(DerivedA.MethodA));
        Console.WriteLine($"DerivedA.MemberA has Inherited attribute: {memberA.GetCustomAttributes(typeof(InheritedAttribute), true).Length > 0}\n");

        Type typeB = typeof(DerivedB);
        Console.WriteLine($"DerivedB has NotInherited attribute: {typeB.GetCustomAttributes(typeof(NotInheritedAttribute), true).Length > 0}");
        MethodInfo memberB = typeB.GetMethod(nameof(DerivedB.MethodB));
        Console.WriteLine($"DerivedB.MemberB has NotInherited attribute: {memberB.GetCustomAttributes(typeof(NotInheritedAttribute), true).Length > 0}");
    }
}
// The example displays the following output:
//       DerivedA has Inherited attribute: True
//       DerivedA.MemberA has Inherited attribute: True
//
//       DerivedB has NotInherited attribute: False
//       DerivedB.MemberB has NotInherited attribute: False
Imports System.Reflection

<InheritedAttribute> Public Class BaseA
    <InheritedAttribute> Public Overridable Sub MethodA()
    End Sub
End Class

Public Class DerivedA : Inherits BaseA
    Public Overrides Sub MethodA()
    End Sub
End Class

<NotInheritedAttribute> Public Class BaseB
    <NotInheritedAttribute> Public Overridable Sub MethodB()
    End Sub
End Class

Public Class DerivedB : Inherits BaseB
    Public Overrides Sub MethodB()
    End Sub
End Class

Module Example
    Public Sub Main()
        Dim typeA As Type = GetType(DerivedA)
        Console.WriteLine($"DerivedA has Inherited attribute: {typeA.GetCustomAttributes(GetType(InheritedAttribute), True).Length > 0}")
        Dim memberA As MethodInfo = typeA.GetMethod(NameOf(DerivedA.MethodA))
        Console.WriteLine($"DerivedA.MemberA has Inherited attribute: {memberA.GetCustomAttributes(GetType(InheritedAttribute), True).Length > 0}")
        Console.WriteLine()

        Dim typeB As Type = GetType(DerivedB)
        Console.WriteLine($"DerivedB has NotInherited attribute: {typeB.GetCustomAttributes(GetType(NotInheritedAttribute), True).Length > 0}")
        Dim memberB As MethodInfo = typeB.GetMethod(NameOf(DerivedB.MethodB))
        Console.WriteLine($"DerivedB.MemberB has Inherited attribute: {memberB.GetCustomAttributes(GetType(NotInheritedAttribute), True).Length > 0}")
    End Sub
End Module
' The example displays the following output:
'       DerivedA has Inherited attribute: True
'       DerivedA.MemberA has Inherited attribute: True
'       
'       DerivedB has Inherited attribute: False
'       DerivedB.MemberB has Inherited attribute: False

如示例的输出所示, DerivedADerivedA.MethodA 继承 InheritedAttribute 属性,但 DerivedBDerivedB.MethodB 不继承 NotInheritedAttribute 属性。As the output from the example shows, DerivedA and DerivedA.MethodA inherit the InheritedAttribute attribute, but DerivedB and DerivedB.MethodB do not inherit the NotInheritedAttribute attribute.

注解

Inherited属性确定:The Inherited property determines:

  • 从用特性标记的基类派生的类是否 AttributeUsageAttribute 继承该特性。Whether classes derived from a base class tagged with the attribute to which the AttributeUsageAttribute attribute is applied inherit that attribute.

  • 派生类的方法(这些方法重写用特性标记的基类方法)是否 AttributeUsageAttribute 继承了该特性。Whether methods of derived classes that override a base class method tagged with the attribute to which the AttributeUsageAttribute attribute is applied inherit that attribute. (如果某个类继承基类成员,则它还将继承应用于该成员的任何属性。 ) (If a class inherits a base class member, it also inherits any attributes applied to that member.)

适用于

另请参阅