FieldInfo.IsAssembly Свойство

Определение

Возвращает значение, которое указывает, описана ли доступность данного поля в поле Assembly; другими словами, будет ли это поле полностью доступно для других полей той же сборки и недоступно для производных типов, не включенных в сборку.Gets a value indicating whether the potential visibility of this field is described by Assembly; that is, the field is visible at most to other types in the same assembly, and is not visible to derived types outside the assembly.

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

Значение свойства

Значение true, если видимость этого поля точно описана в поле Assembly; в противном случае — значение false.true if the visibility of this field is exactly described by Assembly; otherwise, false.

Реализации

Примеры

В следующем примере кода определяются поля с различными уровнями видимости и отображаются значения свойств их IsAssembly, IsFamily, IsFamilyOrAssemblyи IsFamilyAndAssembly.The following code example defines fields with varying levels of visibility, and displays the values of their IsAssembly, IsFamily, IsFamilyOrAssembly, and IsFamilyAndAssembly properties.

Примечание

Visual Basic и C# языки не могут определять поля с видимостью FieldAttributes.FamANDAssem; Этот уровень доступа отображается только в этом C++ примере.The Visual Basic and C# languages cannot define fields with FieldAttributes.FamANDAssem visibility; that access level appears only in the C++ example.

using namespace System;
using namespace System::Reflection;

public ref class Example
{
public:
    int f_public;
internal:
    int f_internal;
protected:
    int f_protected;
protected public:
    int f_protected_public;
protected private:
    int f_protected_private;
};

void main()
{
    Console::WriteLine("\n{0,-30}{1,-18}{2}", "", "IsAssembly", "IsFamilyOrAssembly"); 
    Console::WriteLine("{0,-21}{1,-18}{2,-18}{3}\n", 
        "", "IsPublic", "IsFamily", "IsFamilyAndAssembly");

    for each (FieldInfo^ f in Example::typeid->GetFields(
        BindingFlags::Instance | BindingFlags::NonPublic | BindingFlags::Public))
    {
        Console::WriteLine("{0,-21}{1,-9}{2,-9}{3,-9}{4,-9}{5,-9}", 
            f->Name,
            f->IsPublic,
            f->IsAssembly,
            f->IsFamily,
            f->IsFamilyOrAssembly,
            f->IsFamilyAndAssembly
        );
    }
}

/* This code example produces output similar to the following:

                              IsAssembly        IsFamilyOrAssembly
                     IsPublic          IsFamily          IsFamilyAndAssembly

f_public             True     False    False    False    False
f_internal           False    True     False    False    False
f_protected          False    False    True     False    False
f_protected_public   False    False    False    True     False
f_protected_private  False    False    False    False    True
 */
using System;
using System.Reflection;

public class Example
{
    public int f_public;
    internal int f_internal;
    protected int f_protected;
    protected internal int f_protected_public;

    public static void Main()
    {
        Console.WriteLine("\n{0,-30}{1,-18}{2}", "", "IsAssembly", "IsFamilyOrAssembly"); 
        Console.WriteLine("{0,-21}{1,-18}{2,-18}{3}\n", 
            "", "IsPublic", "IsFamily", "IsFamilyAndAssembly");
   
        foreach (FieldInfo f in typeof(Example).GetFields(
            BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public))
        {
            Console.WriteLine("{0,-21}{1,-9}{2,-9}{3,-9}{4,-9}{5,-9}", 
                f.Name,
                f.IsPublic,
                f.IsAssembly,
                f.IsFamily,
                f.IsFamilyOrAssembly,
                f.IsFamilyAndAssembly
            );
        }
    }
}

/* This code example produces output similar to the following:

                              IsAssembly        IsFamilyOrAssembly
                     IsPublic          IsFamily          IsFamilyAndAssembly

f_public             True     False    False    False    False
f_internal           False    True     False    False    False
f_protected          False    False    True     False    False
f_protected_public   False    False    False    True     False
 */
Imports System.Reflection

Public class Example

    Public f_Public As Integer
    Friend f_Friend As Integer 
    Protected f_Protected As Integer
    Protected Friend f_Protected_Friend As Integer

    Public Shared Sub Main()
    
        Console.WriteLine(vbCrLf & _
            "{0,-30}{1,-18}{2}", "", "IsAssembly", "IsFamilyOrAssembly") 
        Console.WriteLine("{0,-21}{1,-18}{2,-18}{3}" & vbCrLf, _
            "", "IsPublic", "IsFamily", "IsFamilyAndAssembly")
   
        For Each f As FieldInfo In GetType(Example).GetFields( _
            BindingFlags.Instance Or BindingFlags.NonPublic Or BindingFlags.Public)
        
            Console.WriteLine("{0,-21}{1,-9}{2,-9}{3,-9}{4,-9}{5,-9}", _
                f.Name, _
                f.IsPublic, _
                f.IsAssembly, _
                f.IsFamily, _
                f.IsFamilyOrAssembly, _
                f.IsFamilyAndAssembly _
            )
        Next
    End Sub
End Class

' This code example produces output similar to the following:
'
'                              IsAssembly        IsFamilyOrAssembly
'                     IsPublic          IsFamily          IsFamilyAndAssembly
'
'f_Public             True     False    False    False    False
'f_Friend             False    True     False    False    False
'f_Protected          False    False    True     False    False
'f_Protected_Friend   False    False    False    True     False

Комментарии

Фактическая видимость поля ограничивается видимостью его типа.The actual visibility of a field is limited by the visibility of its type. Свойство IsAssembly может быть trueо для поля, но если оно является полем закрытого вложенного типа, поле не отображается за пределами содержащего его типа.The IsAssembly property might be true for a field, but if it is a field of a private nested type then the field is not visible outside the containing type.

Видимость поля точно описывается FieldAttributes.Assembly, если единственным модификатором видимости является internal (Friend в Visual Basic).The visibility of a field is exactly described by FieldAttributes.Assembly if the only visibility modifier is internal (Friend in Visual Basic). Это свойство false для полей, которые protected internal в C# (Protected Friend в Visual Basic, protected public в C++); чтобы указать такие поля, используйте свойство IsFamilyOrAssembly.This property is false for fields that are protected internal in C# (Protected Friend in Visual Basic, protected public in C++); use the IsFamilyOrAssembly property to identify such fields.

Применяется к

Дополнительно