PropertyAttributes Énumération
Définition
Important
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Définit les attributs qui peuvent être associés à une propriété. Ces valeurs d'attribut sont définies dans corhdr.h.
Cette énumération prend en charge une combinaison au niveau du bit de ses valeurs membres.
public enum class PropertyAttributes[System.Flags]
public enum PropertyAttributes[System.Flags]
[System.Serializable]
public enum PropertyAttributes[System.Flags]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public enum PropertyAttributes[<System.Flags>]
type PropertyAttributes = [<System.Flags>]
[<System.Serializable>]
type PropertyAttributes = [<System.Flags>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type PropertyAttributes = Public Enum PropertyAttributes- Héritage
- Attributs
Champs
| HasDefault | 4096 | Spécifie que la propriété a une valeur par défaut. |
| None | 0 | Spécifie qu'aucun attribut n'est associé à une propriété. |
| Reserved2 | 8192 | Réservé. |
| Reserved3 | 16384 | Réservé. |
| Reserved4 | 32768 | Réservé. |
| ReservedMask | 62464 | Indique un indicateur réservé pour une utilisation au moment de l'exécution uniquement. |
| RTSpecialName | 1024 | Spécifie que les API internes de métadonnées doivent vérifier l'encodage des noms. |
| SpecialName | 512 | Spécifie que la propriété est particulière, dont la spécificité est décrite par le nom. |
Exemples
L’exemple suivant génère trois propriétés et affiche la PropertyAttributes valeur énumérée. Notez que la propriété en lecture seule n’a pas de setter et ne peut donc pas être modifiée par.Caption = statement.
using namespace System;
using namespace System::Reflection;
// Define three properties: one read-write, one default,
// and one read only.
// Define a read-write property.
public ref class Aproperty
{
private:
String^ caption;
public:
Aproperty()
: caption( "A Default caption" )
{}
property String^ Caption
{
String^ get()
{
return caption;
}
void set( String^ value )
{
if ( caption != value )
{
caption = value;
}
}
}
};
// Define a default property.
public ref class Bproperty
{
private:
String^ caption;
public:
Bproperty()
: caption( "B Default caption" )
{}
public:
property String^ Item
{
String^ get()
{
return "1";
}
}
property String^ Caption
{
String^ get()
{
return caption;
}
void set( String^ value )
{
if ( caption != value )
{
caption = value;
}
}
}
};
// Define a read-only property.
public ref class Cproperty
{
private:
String^ caption;
public:
Cproperty()
: caption( "C Default caption" )
{}
property String^ Caption
{
String^ get()
{
return caption;
}
}
};
int main()
{
Console::WriteLine( "\nReflection.PropertyAttributes" );
// Determine whether a property exists, and change its value.
Aproperty^ Mypropertya = gcnew Aproperty;
Bproperty^ Mypropertyb = gcnew Bproperty;
Cproperty^ Mypropertyc = gcnew Cproperty;
Console::Write( "\n1. Mypropertya->Caption = {0}", Mypropertya->Caption );
Console::Write( "\n1. Mypropertyb->Caption = {0}", Mypropertyb->Caption );
Console::Write( "\n1. Mypropertyc->Caption = {0}", Mypropertyc->Caption );
// Only Mypropertya can be changed, as Mypropertyb is read-only.
Mypropertya->Caption = "A- This is changed.";
Mypropertyb->Caption = "B- This is changed.";
// Note that Mypropertyc is not changed because it is read only
Console::Write( "\n\n2. Mypropertya->Caption = {0}", Mypropertya->Caption );
Console::Write( "\n2. Mypropertyb->Caption = {0}", Mypropertyb->Caption );
Console::Write( "\n2. Mypropertyc->Caption = {0}", Mypropertyc->Caption );
// Get the PropertyAttributes enumeration of the property.
// Get the type.
Type^ MyTypea = Type::GetType( "Aproperty" );
Type^ MyTypeb = Type::GetType( "Bproperty" );
Type^ MyTypec = Type::GetType( "Cproperty" );
// Get the property attributes.
PropertyInfo^ Mypropertyinfoa = MyTypea->GetProperty( "Caption" );
PropertyAttributes Myattributesa = Mypropertyinfoa->Attributes;
PropertyInfo^ Mypropertyinfob = MyTypeb->GetProperty( "Item" );
PropertyAttributes Myattributesb = Mypropertyinfob->Attributes;
PropertyInfo^ Mypropertyinfoc = MyTypec->GetProperty( "Caption" );
PropertyAttributes Myattributesc = Mypropertyinfoc->Attributes;
// Display the property attributes value.
Console::Write( "\n\na- {0}", Myattributesa );
Console::Write( "\nb- {0}", Myattributesb );
Console::Write( "\nc- {0}", Myattributesc );
return 0;
}
// This example displays the following output to the console
//
// Reflection.PropertyAttributes
//
// 1. Mypropertya.Caption = A Default caption
// 1. Mypropertyb.Caption = B Default caption
// 1. Mypropertyc.Caption = C Default caption
//
// 2. Mypropertya.Caption = A- This is changed.
// 2. Mypropertyb.Caption = B- This is changed.
// 2. Mypropertyc.Caption = C Default caption
//
// a- None
// b- None
// c- None
using System;
using System.Reflection;
// Define three properties: one read-write, one default,
// and one read only.
public class Aproperty
// Define a read-write property.
{
private string caption = "A Default caption";
public string Caption
{
get{return caption;}
set
{
if (caption != value){caption = value;}
}
}
}
public class Bproperty
// Define a default property.
{
private string caption = "B Default caption";
public string this [int index]
{
get {return "1";}
}
public string Caption
{
get{return caption;}
set
{
if (caption != value){caption = value;}
}
}
}
public class Cproperty
// Define a read-only property.
{
private string caption = "C Default caption";
public string Caption
{
get{return caption;}
// No setting is allowed, because this is a read-only property.
}
}
class propertyattributesenum
{
public static int Main(string[] args)
{
Console.WriteLine("\nReflection.PropertyAttributes");
// Determine whether a property exists, and change its value.
Aproperty Mypropertya = new Aproperty();
Bproperty Mypropertyb = new Bproperty();
Cproperty Mypropertyc = new Cproperty();
Console.Write("\n1. Mypropertya.Caption = " + Mypropertya.Caption );
Console.Write("\n1. Mypropertyb.Caption = " + Mypropertyb.Caption );
Console.Write("\n1. Mypropertyc.Caption = " + Mypropertyc.Caption );
// Only Mypropertya can be changed, as Mypropertyb is read-only.
Mypropertya.Caption = "A- This is changed.";
Mypropertyb.Caption = "B- This is changed.";
// Note that Mypropertyc is not changed because it is read only
Console.Write("\n\n2. Mypropertya.Caption = " + Mypropertya.Caption );
Console.Write("\n2. Mypropertyb.Caption = " + Mypropertyb.Caption );
Console.Write("\n2. Mypropertyc.Caption = " + Mypropertyc.Caption );
// Get the PropertyAttributes enumeration of the property.
// Get the type.
Type MyTypea = Type.GetType("Aproperty");
Type MyTypeb = Type.GetType("Bproperty");
Type MyTypec = Type.GetType("Cproperty");
// Get the property attributes.
PropertyInfo Mypropertyinfoa = MyTypea.GetProperty("Caption");
PropertyAttributes Myattributesa = Mypropertyinfoa.Attributes;
PropertyInfo Mypropertyinfob = MyTypeb.GetProperty("Item");
PropertyAttributes Myattributesb = Mypropertyinfob.Attributes;
PropertyInfo Mypropertyinfoc = MyTypec.GetProperty("Caption");
PropertyAttributes Myattributesc = Mypropertyinfoc.Attributes;
// Display the property attributes value.
Console.Write("\n\na- " + Myattributesa.ToString());
Console.Write("\nb- " + Myattributesb.ToString());
Console.Write("\nc- " + Myattributesc.ToString());
return 0;
}
}
// This example displays the following output to the console
//
// Reflection.PropertyAttributes
//
// 1. Mypropertya.Caption = A Default caption
// 1. Mypropertyb.Caption = B Default caption
// 1. Mypropertyc.Caption = C Default caption
//
// 2. Mypropertya.Caption = A- This is changed.
// 2. Mypropertyb.Caption = B- This is changed.
// 2. Mypropertyc.Caption = C Default caption
//
// a- None
// b- None
// c- None
Imports System.Reflection
' Make three properties, one read-write, one default,
' and one read-only.
Public Class Aproperty
' Define a read-write property.
Private myCaption As String = "A Default caption"
Public Property Caption() As String
Get
Return myCaption
End Get
Set(ByVal Value As String)
If myCaption <> value Then
myCaption = value
End If
End Set
End Property
End Class
Public Class Bproperty
' Define a default property.
Private myCaption As String = "B Default caption"
Default Public ReadOnly Property Item(ByVal index As Integer) As String
Get
Return "1"
End Get
End Property
Public Property Caption() As String
Get
Return myCaption
End Get
Set(ByVal Value As String)
If myCaption <> value Then
myCaption = value
End If
End Set
End Property
End Class
Public Class Cproperty
' Define a read-only property.
Private myCaption As String = "C Default caption"
Public ReadOnly Property Caption() As String
Get
Return myCaption
End Get
'No setting is allowed because this property is read-only.
End Property
End Class
Class propertyattributesenum
Public Shared Function Main() As Integer
Console.WriteLine(ControlChars.CrLf & "Reflection.PropertyAttributes")
' Determine whether a property exists, and change its value.
Dim Mypropertya As New Aproperty()
Dim Mypropertyb As New Bproperty()
Dim Mypropertyc As New Cproperty()
Console.Write(ControlChars.CrLf & "1. Mypropertya.Caption = " & _
Mypropertya.Caption)
Console.Write(ControlChars.CrLf & "1. Mypropertyb.Caption = " & _
Mypropertyb.Caption)
Console.Write(ControlChars.CrLf & "1. Mypropertyc.Caption = " & _
Mypropertyc.Caption)
' Only Mypropertya can be changed because Mypropertyb is read-only.
Mypropertya.Caption = "A- This is changed."
Mypropertyb.Caption = "B- This is changed."
' Note that Mypropertyc is not changed, because it is read-only.
Console.Write(ControlChars.CrLf & ControlChars.CrLf & _
"2. Mypropertya.Caption = " & Mypropertya.Caption)
Console.Write(ControlChars.CrLf & "2. Mypropertyb.Caption = " & _
Mypropertyb.Caption)
Console.Write(ControlChars.CrLf + "2. Mypropertyc.Caption = " & _
Mypropertyc.Caption)
' Get the PropertyAttributes Enumeration of the property.
' Get the type.
Dim MyTypea As Type = Type.GetType("Aproperty")
Dim MyTypeb As Type = Type.GetType("Bproperty")
Dim MyTypec As Type = Type.GetType("Cproperty")
' Get the property attributes.
Dim Mypropertyinfoa As PropertyInfo = MyTypea.GetProperty("Caption")
Dim Myattributesa As PropertyAttributes = Mypropertyinfoa.Attributes
Dim Mypropertyinfob As PropertyInfo = MyTypeb.GetProperty("Item")
Dim Myattributesb As PropertyAttributes = Mypropertyinfob.Attributes
Dim Mypropertyinfoc As PropertyInfo = MyTypec.GetProperty("Caption")
Dim Myattributesc As PropertyAttributes = Mypropertyinfoc.Attributes
' Display the property attributes value.
Console.Write(ControlChars.CrLf & ControlChars.CrLf & "a- " & _
Myattributesa.ToString())
Console.Write(ControlChars.CrLf & "b- " & Myattributesb.ToString())
Console.Write(ControlChars.CrLf & "c- " & Myattributesc.ToString())
Return 0
End Function' End Function
End Class
' This example displays the following output to the console
'
' Reflection.PropertyAttributes
'
' 1. Mypropertya.Caption = A Default caption
' 1. Mypropertyb.Caption = B Default caption
' 1. Mypropertyc.Caption = C Default caption
'
' 2. Mypropertya.Caption = A- This is changed.
' 2. Mypropertyb.Caption = B- This is changed.
' 2. Mypropertyc.Caption = C Default caption
'
' a- None
' b- None
' c- None
Remarques
Pour obtenir le PropertyAttributes, commencez par obtenir la classe Type. À partir de Type, obtenez le PropertyInfo. À partir de PropertyInfo, obtenez le Attributes.
La valeur énumérée est un nombre représentant l’OR au niveau du bit des attributs implémentés sur la méthode.
S’applique à
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