MethodBase.IsHideBySig Özellik

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

public bool IsHideBySig { get; }

member this.IsHideBySig : bool

Public ReadOnly Property IsHideBySig As Boolean

Özellik Değeri

true üye imzayla gizlenmişse; aksi takdirde , false.

Uygulamalar

Örnekler

Aşağıdaki kod örneği, aşırı yüklenmiş yöntemi olan bir temel sınıf ve aşırı yüklemelerden birini gizleyen türetilmiş bir sınıf içerir. Kod örneğinin Visual Basic sürümünde, IsHideBySig özelliği türetilmiş sınıftaki üye için döndürür false . Kod örneğinin C# sürümünde, özelliği türetilmiş sınıftaki üye için döndürür 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)

Açıklamalar

Türetilmiş sınıftaki bir üye C# new değiştiricisi veya Visual Basic Shadows değiştiricisi ile bildirildiğinde, temel sınıfta aynı ada sahip bir üyeyi gizleyebilir. C# temel sınıf üyelerini imzaya göre gizler. Diğer bir ifadeyle, temel sınıf üyesinin birden çok aşırı yüklemesi varsa, gizli olan tek kişi aynı imzaya sahip olandır. Buna karşılık, Visual Basic tüm temel sınıf aşırı yüklemelerini gizler. Bu nedenle, IsHideBySig Visual Basic Shadows değiştiricisi ile bildirilen bir üyede ve true C# new değiştiricisi ile bildirilen bir üyede döndürürfalse.

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