MethodBase.IsHideBySig Eigenschaft

public:
 property bool IsHideBySig { bool get(); };

public bool IsHideBySig { get; }

member this.IsHideBySig : bool

Public ReadOnly Property IsHideBySig As Boolean

Eigenschaftswert

true, wenn der Member durch die Signatur verborgen ist, andernfalls false.

Implementiert

Beispiele

Das folgende Codebeispiel enthält eine Basisklasse mit einer überladenen Methode und eine abgeleitete Klasse, die eine der Überladungen ausblendet. In der Visual Basic-Version des Codebeispiels gibt die IsHideBySig -Eigenschaft für das Element in der abgeleiteten Klasse zurück false . In der C#-Version des Codebeispiels gibt die -Eigenschaft für den Member in der abgeleiteten Klasse zurück true .

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.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
End Class

' 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)

Hinweise

Wenn ein Member in einer abgeleiteten Klasse mit dem C#- new Modifizierer oder dem Visual Basic-Modifizierer Shadows deklariert wird, kann es ein Element mit demselben Namen in der Basisklasse ausblenden. C# blendet Basisklassenmember nach Signatur aus. Das heißt, wenn der Basisklassenmember mehrere Überladungen aufweist, ist die einzige, die ausgeblendet wird, die über die identische Signatur verfügt. Im Gegensatz dazu blendet Visual Basic alle Basisklassenüberladungen aus. Gibt daher für ein Element zurück, IsHideBySig das mit dem Visual Basic-Modifizierer Shadows deklariert wurde, und true für ein Element, das mit dem C#- new Modifizierer deklariert false wurde.

Gilt für: