AttributeUsageAttribute.Inherited 屬性

參考

定義

命名空間:: System

組件:: System.Runtime.dll

組件:: mscorlib.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

取得或設定 Boolean 值，判斷指示的屬性是否由衍伸類別繼承並覆寫成員。

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

屬性值

Boolean

如果屬性可以由衍伸類別繼承並覆寫成員，則為 true；否則為 false。預設為 true。

範例

下列範例說明 AttributeUsageAttribute Inherited 套用屬性值 true 的屬性，以及 false AttributeUsageAttribute Inherited 套用屬性值的屬性之間的差異。此範例會定義兩個屬性和 InheritedAttribute NotInheritedAttribute 。這兩個屬性都可以套用至類別和方法。 Inherited因為套用 InheritedAttribute 屬性的 AttributeUsageAttribute 屬性是 true ，所以會由衍生類別和覆寫基類方法之衍生類別的成員繼承。另一方面，因為 Inherited 套用 NotInheritedAttribute 至之屬性的 AttributeUsageAttribute 屬性是 false ，所以不會由衍生類別和覆寫基類方法之衍生類別的成員繼承。

[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

此範例接著會定義兩個基類。第一個是 BaseA ，具有單一方法 MethodA 。第二個是 BaseB ，具有單一方法 MethodB 。 BaseA 和 MethodA 會以 InheritedAttribute 屬性標記，並以 BaseB MethodB 屬性標記 NotInheritedAttribute 。 DerivedA 繼承自 BaseA 並覆寫其 MethodA 方法。 DerivedB 繼承自 BaseB 並覆寫其 MethodB 方法。

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

如範例的輸出所示， DerivedA 並 DerivedA.MethodA 繼承 InheritedAttribute 屬性，但 DerivedB DerivedB.MethodB 不會繼承 NotInheritedAttribute 屬性。

備註

屬性 Inherited 決定：

衍生自基類的類別是否使用套用屬性 AttributeUsageAttribute 所標記的基類繼承該屬性。
套用屬性之屬性 AttributeUsageAttribute 所標記之基類方法的衍生類別方法是否繼承該屬性。 (如果類別繼承基類成員，它也會繼承套用至該成員的任何屬性。)

適用於

另請參閱

Attribute

AttributeUsageAttribute.Inherited 屬性

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定義

屬性值

範例

備註

適用於

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