MethodBase.IsHideBySig MethodBase.IsHideBySig MethodBase.IsHideBySig MethodBase.IsHideBySig Property

定義

派生クラスで、正確に同じシグネチャを持つ同じ種類のメンバーだけが隠しメンバーになるかどうかを示す値を取得します。Gets a value indicating whether only a member of the same kind with exactly the same signature is hidden in the derived class.

public:
 property bool IsHideBySig { bool get(); };
public bool IsHideBySig { get; }
member this.IsHideBySig : bool
Public ReadOnly Property IsHideBySig As Boolean

プロパティ値

メンバーがシグネチャで隠される場合は true。それ以外の場合は falsetrue if the member is hidden by signature; otherwise, false.

実装

次のコード例には、オーバー ロードされたメソッドを持つ基底クラスと、オーバー ロードのいずれかの操作を非表示にする派生クラスが含まれています。The following code example contains a base class with an overloaded method, and a derived class that hides one of the overloads. コード例は、Visual Basic バージョンのIsHideBySigプロパティが返すfalseの派生クラスのメンバー。In the Visual Basic version of the code example, the IsHideBySig property returns false for the member in the derived class. コード サンプルの C# バージョンでは、プロパティを返しますtrue派生クラスでメンバーにします。In the C# version of the code sample, the property returns true for the member in the derived class.

using namespace System;
using namespace System::Reflection;

// The base class Parent contains an overloaded method PrintCall.
//
public ref class Parent
{
public:
    virtual void PrintCall()
    {
        Console::WriteLine("Parent's PrintCall()");
    }
public:
    virtual void PrintCall(int x)
    {
        Console::WriteLine("Parent's PrintCall({0})", x);
    }
};

// The derived class Child hides one overload of the inherited 
// method PrintCall.
//
public ref class Child : public Parent
{
public:
    void PrintCall(int i) new
    {
        Console::WriteLine("Child's PrintCall({0})", i);
    }
};

int main()
{
    Child^ childInstance = gcnew Child();

    // In C#, the method in the derived class hides by name and by
    // signature, so the overload in the derived class hides only one
    // of the overloads in the base class.
    //
    Console::WriteLine("------ List the overloads of PrintCall in the " +
        "derived class Child ------");
    Type^ t = childInstance->GetType();
    for each(MethodInfo^ minfo in t->GetMethods())
    {
        if (minfo->Name == "PrintCall")
        {
            Console::WriteLine("Overload of PrintCall: {0}" +
                " IsHideBySig = {1}, DeclaringType = {2}", 
                minfo, minfo->IsHideBySig, minfo->DeclaringType);
        }
    }

    // The method PrintCall in the derived class hides one overload of the 
    // method in Parent.  Contrast this with Visual Basic, which hides by
    // name instead of by name and signature.  In Visual Basic, the
    // parameterless overload of PrintCall would be unavailable from Child.
    //
    Console::WriteLine(
        "------ Call the overloads of PrintCall available in Child ------");
    childInstance->PrintCall();
    childInstance->PrintCall(42);

    // If Child is cast to the base type Parent, both overloads of the 
    // shadowed method can be called.
    //
    Console::WriteLine(
        "------ Call the shadowed overloads of PrintCall ------");
    Parent^ parentInstance = childInstance;
    parentInstance->PrintCall();
    parentInstance->PrintCall(42);
}

/* This code example produces the following output:

------ List the overloads of PrintCall in the derived class Child ------
Overload of PrintCall: Void PrintCall(Int32) IsHideBySig = True, DeclaringType = Child
Overload of PrintCall: Void PrintCall() IsHideBySig = True, DeclaringType = Parent
Overload of PrintCall: Void PrintCall(Int32) IsHideBySig = True, DeclaringType = Parent
------ Call the overloads of PrintCall available in Child ------
Parent's PrintCall()
Child's PrintCall(42)
------ Call the shadowed overloads of PrintCall ------
Parent's PrintCall()
Parent's PrintCall(42)

*/

using System;
using System.Reflection;

// The base class B contains an overloaded method M.
//
public class B
{
    public virtual void M()
    {
        Console.WriteLine("B's M()");
    }
    public virtual void M(int x)
    {
        Console.WriteLine("B's M({0})", x);
    }
}

// The derived class D hides one overload of the inherited 
// method M.
//
public class D:
    B
{
    new public void M(int i)
    {
        Console.WriteLine("D's M({0})", i);
    }
}

public class Test
{
    public static void Main()
    {
        D dinst = new D();
        // In C#, the method in the derived class hides by name and by
        // signature, so the overload in the derived class hides only one
        // of the overloads in the base class.
        //
        Console.WriteLine("------ List the overloads of M in the derived class D ------");
        Type t = dinst.GetType();
        foreach( MethodInfo minfo in t.GetMethods() )
        {
            if (minfo.Name=="M") {Console.WriteLine("Overload of M: {0}  IsHideBySig = {1}, DeclaringType = {2}", minfo, minfo.IsHideBySig, minfo.DeclaringType);}
        }

        // The method M in the derived class hides one overload of the 
        // method in B.  Contrast this with Visual Basic, which hides by
        // name instead of by name and signature.  In Visual Basic, the
        // parameterless overload of M would be unavailable from D.
        //
        Console.WriteLine("------ Call the overloads of M available in D ------");
        dinst.M();
        dinst.M(42);
        
        // If D is cast to the base type B, both overloads of the 
        // shadowed method can be called.
        //
        Console.WriteLine("------ Call the shadowed overloads of M ------");
        B binst = dinst;
        binst.M();
        binst.M(42);
    } //Main
} //Test

/* This code example produces the following output:

------ List the overloads of M in the derived class D ------
Overload of M: Void M(Int32)  IsHideBySig = True, DeclaringType = B
Overload of M: Void M()  IsHideBySig = True, DeclaringType = B
Overload of M: Void M(Int32)  IsHideBySig = True, DeclaringType = D
------ Call the overloads of M available in D ------
B's M()
D's M(42)
------ Call the shadowed overloads of M ------
B's M()
B's M(42)
*/

Imports System
Imports System.Reflection

' The base class B contains an overloaded method M.
'
Public Class B
    Public Overridable Sub M()
        Console.WriteLine("B's M()")
    End Sub
    Public Overridable Sub M(ByVal x As Integer)
        Console.WriteLine("B's M({0})", x)
    End Sub
End Class

' The derived class D hides the inherited method M.
'
Public Class D
    Inherits B
    Shadows Public Sub M(ByVal i As Integer)
        Console.WriteLine("D's M({0})", i)
    End Sub
End Class

Public Class Test
    Public Shared Sub Main()
        Dim dinst As New D()
        ' In Visual Basic, the method in the derived class hides by
        ' name, rather than by signature.  Thus, although a list of all the 
        ' overloads of M shows three overloads, only one can be called from
        ' class D.  
        '
        Console.WriteLine("------ List the overloads of M in the derived class D ------")
        Dim t As Type = dinst.GetType()
        For Each minfo As MethodInfo In t.GetMethods()
            If minfo.Name = "M" Then Console.WriteLine( _
                "Overload of M: {0}  IsHideBySig = {1}, DeclaringType = {2}", _
                minfo, minfo.IsHideBySig, minfo.DeclaringType)
        Next

        ' The method M in the derived class hides the method in B.
        '
        Console.WriteLine("------ Call the overloads of M available in D ------")
        ' The following line causes a compile error, because both overloads
        ' in the base class are hidden.  Contrast this with C#, where only 
        ' one of the overloads of B would be hidden.
        'dinst.M()
        dinst.M(42)
        
        ' If D is cast to the base type B, both overloads of the 
        ' shadowed method can be called.
        '
        Console.WriteLine("------ Call the shadowed overloads of M ------")
        Dim binst As B = dinst
        binst.M()
        binst.M(42)         
    End Sub 'Main
End Class 'Test

' This code example produces the following output:
' ------ List the overloads of M in the derived class D ------
' Overload of M: Void M(Int32)  IsHideBySig = False, DeclaringType = B
' Overload of M: Void M()  IsHideBySig = False, DeclaringType = B
' Overload of M: Void M(Int32)  IsHideBySig = False, DeclaringType = D
' ------ Call the overloads of M available in D ------
' D's M(42)
' ------ Call the shadowed overloads of M ------
' B's M()
' B's M(42)

注釈

派生クラスでメンバーが、C# で宣言されている場合new修飾子または Visual BasicShadows修飾子は、基底クラスで同じ名前のメンバーを非表示にできます。When a member in a derived class is declared with the C# new modifier or the Visual Basic Shadows modifier, it can hide a member of the same name in the base class. C# シグネチャで基本クラスのメンバーを非表示にします。C# hides base class members by signature. これは基底クラスのメンバーに複数のオーバー ロードがある場合は、非表示には、1 つだけは、同じシグネチャを持つ 1 つがあります。That is, if the base class member has multiple overloads, the only one that is hidden is the one that has the identical signature. これに対し、Visual Basic では、すべての基底クラスのオーバー ロードを非表示になります。By contrast, Visual Basic hides all the base class overloads. したがって、IsHideBySigを返しますfalseVisual Basic で宣言されたメンバーにShadows修飾子、およびtrue、C# で宣言されたメンバーのnew修飾子。Thus, IsHideBySig returns false on a member declared with the Visual Basic Shadows modifier, and true on a member declared with the C# new modifier.

警告

このプロパティは、メソッドがあるかどうかを決定しません、NewSlot属性。This property does not determine whether a method has the NewSlot attribute. いずれかで宣言されたメソッド、newまたはShadows修飾子が必要があります、NewSlot属性がで宣言されたメソッドのみnew(つまり、C# メソッドのみ) 必要があります、 IsHideBySig に設定するプロパティtrue.A method that is declared with either the new or the Shadows modifier will have the NewSlot attribute, but only methods declared with new (that is, only C# methods) will have the IsHideBySig property set to true. メソッドがあるかどうかを確認する、NewSlot属性を次のようなコードを使用して: if ((myMethodInfo.Attributes & MethodAttributes.VtableLayoutMask) == MethodAttributes.NewSlot) (C#) またはIf (myMethodInfo.Attributes And MethodAttributes.VtableLayoutMask) = MethodAttributes.NewSlotVisual Basic でします。To determine whether a method has the NewSlot attribute, use code similar to the following: if ((myMethodInfo.Attributes & MethodAttributes.VtableLayoutMask) == MethodAttributes.NewSlot) in C# or If (myMethodInfo.Attributes And MethodAttributes.VtableLayoutMask) = MethodAttributes.NewSlot in Visual Basic. ただしをで宣言されたすべてのメソッドがnewまたはShadowsが、NewSlot属性を持つすべてのメソッド、NewSlot属性を使用して宣言newまたはShadowsします。Note, however, that although all methods declared with new or Shadows have the NewSlot attribute, not all methods that have the NewSlot attribute are declared with new or Shadows.

適用対象