AttributeUsageAttribute.Inherited Properti
Definisi
Penting
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Mendapatkan atau menetapkan Boolean nilai yang menentukan apakah atribut yang ditunjukkan diwariskan oleh kelas turunan dan mengganti anggota.
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
Nilai Properti
true jika atribut dapat diwariskan oleh kelas turunan dan mengambil alih anggota; jika tidak, false. Defaultnya adalah true.
Contoh
Contoh berikut mengilustrasikan perbedaan antara atribut yang AttributeUsageAttribute atributnya dengan Inherited nilai true properti diterapkan dan atribut dengan AttributeUsageAttributeInherited nilai false properti diterapkan. Contoh mendefinisikan dua atribut, InheritedAttribute dan NotInheritedAttribute. Kedua atribut dapat berlaku untuk kelas dan metode.
Inherited Karena properti atribut yang AttributeUsageAttribute diterapkan InheritedAttribute adalah true, properti tersebut diwarisi oleh kelas turunan dan anggota kelas turunan yang mengambil alih metode kelas dasar. Di sisi lain, karena Inherited properti AttributeUsageAttribute atribut yang diterapkan NotInheritedAttribute adalah false, itu tidak diwariskan oleh kelas turunan dan anggota kelas turunan yang mengambil alih metode kelas dasar.
[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 ||| AttributeTargets.Method ||| AttributeTargets.Property ||| AttributeTargets.Field, Inherited = true)>]
type InheritedAttribute() =
inherit Attribute()
[<AttributeUsage(AttributeTargets.Class ||| AttributeTargets.Method ||| AttributeTargets.Property ||| AttributeTargets.Field, Inherited = false)>]
type NotInheritedAttribute() =
inherit 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
Contoh kemudian mendefinisikan dua kelas dasar. Yang pertama, BaseA, memiliki satu metode, MethodA. Yang kedua, BaseB, memiliki satu metode, MethodB.
BaseA dan MethodA ditandai dengan InheritedAttribute atribut , dan BaseB dan MethodB ditandai dengan NotInheritedAttribute atribut .
DerivedA mewarisi dari BaseA dan mengambil alih metodenya MethodA .
DerivedB mewarisi dari BaseB dan mengambil alih metodenya MethodB .
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
[<Inherited>]
type BaseA() =
abstract member MethodA: unit -> unit
[<Inherited>]
default _.MethodA() = ()
type DerivedA() =
inherit BaseA()
override _.MethodA() = ()
[<NotInherited>]
type BaseB() =
abstract member MethodB: unit -> unit
[<NotInherited>]
default _.MethodB() = ()
type DerivedB() =
inherit BaseB()
override _.MethodB() = ()
let typeA = typeof<DerivedA>
printfn $"DerivedA has Inherited attribute: {typeA.GetCustomAttributes(typeof<InheritedAttribute>, true).Length > 0}"
let memberA = typeA.GetMethod "MethodA"
printfn $"DerivedA.MemberA has Inherited attribute: {memberA.GetCustomAttributes(typeof<InheritedAttribute>, true).Length > 0}\n"
let typeB = typeof<DerivedB>
printfn $"DerivedB has NotInherited attribute: {typeB.GetCustomAttributes(typeof<NotInheritedAttribute>, true).Length > 0}"
let memberB = typeB.GetMethod "MethodB"
printfn $"DerivedB.MemberB has NotInherited attribute: {memberB.GetCustomAttributes(typeof<NotInheritedAttribute>, true).Length > 0}"
// The example displays the following output:
// DerivedA has Inherited attribute: True
// DerivedA.MemberA has Inherited attribute: True
//
// DerivedB has NotInherited attribute: False
// DerivedB.MemberB has NotInherited attribute: False
Imports System.Reflection
<InheritedAttribute> Public Class BaseA
<InheritedAttribute> Public Overridable Sub MethodA()
End Sub
End Class
Public Class DerivedA : Inherits BaseA
Public Overrides Sub MethodA()
End Sub
End Class
<NotInheritedAttribute> Public Class BaseB
<NotInheritedAttribute> Public Overridable Sub MethodB()
End Sub
End Class
Public Class DerivedB : Inherits BaseB
Public Overrides Sub MethodB()
End Sub
End Class
Module Example
Public Sub Main()
Dim typeA As Type = GetType(DerivedA)
Console.WriteLine($"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
Seperti yang ditunjukkan oleh output dari contoh, DerivedA dan DerivedA.MethodA mewarisi InheritedAttribute atribut , tetapi DerivedB dan DerivedB.MethodB tidak mewarisi NotInheritedAttribute atribut .
Keterangan
Properti Inherited menentukan:
Apakah kelas yang berasal dari kelas dasar yang ditandai dengan atribut tempat atribut diterapkan mewarisi atribut tersebut AttributeUsageAttribute .
Apakah metode kelas turunan yang mengambil alih metode kelas dasar yang ditandai dengan atribut tempat atribut diterapkan mewarisi atribut tersebut AttributeUsageAttribute . (Jika kelas mewarisi anggota kelas dasar, kelas tersebut juga mewarisi atribut apa pun yang diterapkan kepada anggota tersebut.)