_FieldInfo.IsFamilyとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

FieldInfo.IsFamily プロパティ

このフィールドに、ファミリレベルの参照可能範囲が設定されているかどうかを示す値を取得します。

名前空間: System.Reflection
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public ReadOnly Property
 IsFamily As Boolean

Visual Basic (使用法)

Dim instance As FieldInfo
Dim value As Boolean

value = instance.IsFamily

public bool IsFamily { get;
 }

C++

public:
virtual property bool IsFamily {
    bool get () sealed;
}

/** @property */
public final boolean get_IsFamily ()

JScript

public final function get
 IsFamily () : boolean

プロパティ値
フィールドに Family 属性が設定されている場合は true。それ以外の場合は false。

解説

このプロパティは派生クラスのすべてのメンバから呼び出せますが、他の型からは呼び出せません。

IsFamily プロパティを取得するには、最初に Type クラスを取得します。そして、その Type から FieldInfo を取得します。最後に、FieldInfo から IsFamily を取得します。

IsFamily プロパティは、FieldAttributes.Family 属性が設定されたときに設定されます。

使用例

2 つのプロパティを作成する例を次に示します。最初のプロパティにはプライベート文字列フィールドがあり、2 番目のプロパティにはプロテクト文字列フィールドがあります。そのため、IsFamily プロパティに true が設定されます。

Visual Basic

Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic


'Make two fields.

Public Class Myfielda
    Private field As String
 = "A private field"

    Public Property MyField() As
 String
        Get
            Return Field
        End Get
        Set(ByVal Value As
 String)
            If field <> Value Then
                field = Value
            End If
        End Set
    End Property
End Class 'Myfielda

Public Class Myfieldb
    Protected field As String
 = "B protected field"

    Public Property MyField() As
 String
        Get
            Return Field
        End Get
        Set(ByVal Value As
 String)
            If field <> Value Then
                field = Value
            End If
        End Set
    End Property
End Class 'Myfieldb

Public Class Myfieldinfo

    Public Shared Function
 Main() As Integer
        Console.WriteLine(ControlChars.Lf & "Reflection.FieldInfo")
        Dim Myfielda As New
 Myfielda()
        Dim Myfieldb As New
 Myfieldb()

        ' Get the Type and FieldInfo.
        Dim MyTypea As Type = GetType(Myfielda)
        Dim Myfieldinfoa As FieldInfo = MyTypea.GetField("field",
 _
            BindingFlags.NonPublic Or BindingFlags.Instance)
        Dim MyTypeb As Type = GetType(Myfieldb)
        Dim Myfieldinfob As FieldInfo = MyTypeb.GetField("field",
 _
            BindingFlags.NonPublic Or BindingFlags.Instance)

        ' For the first field, get and display the Name, field, and
 IsFamily.
        Console.Write(ControlChars.Lf & "{0} - ",
 MyTypea.FullName)
        Console.Write("{0} - ", Myfieldinfoa.GetValue(Myfielda))
        Console.Write(ControlChars.Lf & "  IsFamily - {0}",
 Myfieldinfoa.IsFamily)
        Console.Write(ControlChars.Lf & "  FieldAttributes
 - {0}", _
            Myfieldinfoa.Attributes.ToString())

        ' For the second field, get and Display the Name, field, and
 IsFamily.
        Console.WriteLine()
        Console.Write(ControlChars.Lf & "{0} - ",
 MyTypeb.FullName)
        Console.Write("{0} - ", Myfieldinfob.GetValue(Myfieldb))
        Console.Write(ControlChars.Lf & "  IsFamily - {0}",
 Myfieldinfob.IsFamily)
        Dim Myfieldattributesb As FieldAttributes
 = Myfieldinfob.Attributes
        Console.Write(ControlChars.Lf & "  FieldAttributes
 - {0}", _
            Myfieldinfob.Attributes.ToString())

        Return 0
    End Function 'Main
End Class 'Myfieldinfo

using System;
using System.Reflection;

//Make two fields.
public class Myfielda
{
    private string field = "A private
 field";
    public string Field
    {
        get{return field;}
        set{if(field!=value){field=value;}}
    }
}
 
public class Myfieldb
{
    protected string field = "B protected
 field";
    public string Field
    {
        get{return field;}
        set{if(field!=value){field=value;}}
    }
}
  
public class Myfieldinfo
{
    public static int Main()
    {
        Console.WriteLine("\nReflection.FieldInfo");
        Myfielda Myfielda = new Myfielda();
        Myfieldb Myfieldb = new Myfieldb();
  
        // Get the Type and FieldInfo.
        Type MyTypea = typeof(Myfielda);
        FieldInfo Myfieldinfoa = MyTypea.GetField("field",
            BindingFlags.NonPublic|BindingFlags.Instance);
        Type MyTypeb = typeof(Myfieldb);
        FieldInfo Myfieldinfob = MyTypeb.GetField("field",
            BindingFlags.NonPublic|BindingFlags.Instance);
  
        // For the first field, get and display the Name, field, and
 IsFamily.
        Console.Write("\n{0} - ", MyTypea.FullName);
        Console.Write("{0} - ", Myfieldinfoa.GetValue(Myfielda));
        Console.Write("\n  IsFamily - {0}", Myfieldinfoa.IsFamily);
        Console.Write("\n  FieldAttributes - {0}",
            Myfieldinfoa.Attributes.ToString());
  
        // For the second field, get and Display the Name, field, and
 IsFamily.
        Console.WriteLine();
        Console.Write("\n{0} - ", MyTypeb.FullName);
        Console.Write("{0} - ", Myfieldinfob.GetValue(Myfieldb));
        Console.Write("\n  IsFamily - {0}", Myfieldinfob.IsFamily);
        FieldAttributes Myfieldattributesb = Myfieldinfob.Attributes;
        Console.Write("\n  FieldAttributes - {0}",
            Myfieldinfob.Attributes.ToString());
  
        return 0;
    }
}

C++

using namespace System;
using namespace System::Reflection;

//Make two fields.
public ref class Myfielda
{
private:
   String^ field;

public:
   Myfielda()
      : field( "A private field" )
   {}


   property String^ Field 
   {
      String^ get()
      {
         return field;
      }

      void set( String^ value )
      {
         if ( field != value )
         {
            field = value;
         }
      }

   }

};

public ref class Myfieldb
{
protected:
   String^ field;

public:
   Myfieldb()
      : field( "B public field" )
   {}


   property String^ Field 
   {
      String^ get()
      {
         return field;
      }

      void set( String^ value )
      {
         if ( field != value )
         {
            field = value;
         }
      }

   }

};

int main()
{
   Console::WriteLine( "\nReflection.FieldInfo" );
   Myfielda^ myfielda = gcnew Myfielda;
   Myfieldb^ myfieldb = gcnew Myfieldb;
   
   // Get the Type and FieldInfo.
   Type^ MyTypea = Type::GetType( "Myfielda" );
   FieldInfo^ Myfieldinfoa = MyTypea->GetField( "field", static_cast<BindingFlags>(BindingFlags::NonPublic
 | BindingFlags::Instance) );
   Type^ MyTypeb = Type::GetType( "Myfieldb" );
   FieldInfo^ Myfieldinfob = MyTypeb->GetField( "field", static_cast<BindingFlags>(BindingFlags::NonPublic
 | BindingFlags::Instance) );
   
   // For the first field, get and display the Name, field, and IsFamily.
   Console::Write( "\n{0} - ", MyTypea->FullName );
   Console::Write( "{0} - ", Myfieldinfoa->GetValue( myfielda ) );
   Console::Write( "\n  IsFamily - {0}", Myfieldinfoa->IsFamily );
   Console::Write( "\n  FieldAttributes - {0}", Myfieldinfoa->Attributes
 );
   
   // For the second field, get and Display the Name, field, and IsFamily.
   Console::WriteLine();
   Console::Write( "\n{0} - ", MyTypeb->FullName );
   Console::Write( "{0} - ", Myfieldinfob->GetValue( myfieldb ) );
   Console::Write( "\n  IsFamily - {0}", Myfieldinfob->IsFamily );
   Console::Write( "\n  FieldAttributes - {0}", Myfieldinfob->Attributes
 );
   return 0;
}

import System.*;
import System.Reflection.*;

//Make two fields.
public class MyFieldA
{
    private String field = "A private
 field";

    /** @property 
     */
    public String get_Field()
    {
        return field;
    } //get_Field

    /** @property 
     */
    public void set_Field(String value)
    {
        if (field != value) {
            field = value;
        }
    } //set_Field
} //MyFieldA

public class MyFieldB
{
    protected String field = "B public
 field";

    /** @property 
     */
    public String get_Field()
    {
        return field;
    } //get_Field

    /** @property 
     */
    public void set_Field(String value)
    {
        if (field != value) {
            field = value;
        }
    } //set_Field
} //MyFieldB

public class MyFieldInfo
{
    public static void main(String[]
 args)
    {
        Console.WriteLine("\nReflection.FieldInfo");
        MyFieldA myFieldA = new MyFieldA();
        MyFieldB myFieldB = new MyFieldB();

        // Get the Type and FieldInfo.
        Type myTypeA = Type.GetType("MyFieldA");
        FieldInfo myFieldInfoA = myTypeA.GetField("field", 
            BindingFlags.NonPublic | BindingFlags.Instance);
        Type myTypeB = Type.GetType("MyFieldB");
        FieldInfo myFieldInfoB = myTypeB.GetField("field", 
            BindingFlags.NonPublic | BindingFlags.Instance);

        // For the first field, get and display the Name, field, and
 IsFamily.
        Console.Write("\n{0} - ", myTypeA.get_FullName());
        Console.Write("{0} - ", myFieldInfoA.GetValue(myFieldA));
        Console.Write("\n  IsFamily - {0}", 
            (System.Boolean)myFieldInfoA.get_IsFamily());
        Console.Write("\n  FieldAttributes - {0}", 
            myFieldInfoA.get_Attributes().ToString());

        // For the second field, get and Display the Name, field, and
 IsFamily.
        Console.WriteLine();
        Console.Write("\n{0} - ", myTypeB.get_FullName());
        Console.Write("{0} - ", myFieldInfoB.GetValue(myFieldB));
        Console.Write("\n  IsFamily - {0}",
            (System.Boolean)myFieldInfoB.get_IsFamily());
        FieldAttributes Myfieldattributesb = myFieldInfoB.get_Attributes();
        Console.Write("\n  FieldAttributes - {0}",
            myFieldInfoB.get_Attributes().ToString());

        return;
    } //main
} //MyFieldInfo

JScript

//Make two fields.
import System;
import System.Reflection;

public class Myfielda
{
   private var field : String = "A private
 field";
   public function get Field()
 : String {
       return field;
   }
   public function set Field(value
 : String) {    
       if (field!=value) field=value;
   }
}

public class Myfieldb
{
   protected var field : String = "B public
 field";
   public function get Field()
 : String {
       return field;
   }
   public function set Field(value
 : String) {    
      if (field!=value) field=value;
   }
}
 
public class Myfieldinfo
{
   public static function
 Main() : void
   {
      Console.WriteLine("\nReflection.FieldInfo");
      var myfielda : Myfielda = new Myfielda();
      var myfieldb : Myfieldb = new Myfieldb();
 
      //Get the Type and FieldInfo.
      var MyTypea : Type = Type.GetType("Myfielda");
      var Myfieldinfoa : FieldInfo = MyTypea.GetField("field",
 BindingFlags.Instance|BindingFlags.NonPublic);
      var MyTypeb : Type = Type.GetType("Myfieldb");
      var Myfieldinfob : FieldInfo = MyTypeb.GetField("field",
 BindingFlags.Instance|BindingFlags.NonPublic);
 
      //For the first field, get and display the Name, field, and IsFamily.
      Console.Write("\n{0} - ", MyTypea.FullName);
      Console.Write("{0} - ", Myfieldinfoa.GetValue(myfielda));
      Console.Write("\n  IsFamily - {0}", Myfieldinfoa.IsFamily);
      Console.Write("\n  FieldAttributes - {0}",
         Myfieldinfoa.Attributes.ToString());
 
      //For the second field, get and Display the Name, field, and IsFamily.
      Console.Write("\n{0} - ", MyTypeb.FullName);
      Console.Write("{0} - ", Myfieldinfob.GetValue(myfieldb));
      Console.Write("\n  IsFamily - {0}", Myfieldinfob.IsFamily);
      var Myfieldattributesb : FieldAttributes = Myfieldinfob.Attributes;
      Console.Write("\n  FieldAttributes - {0}",
         Myfieldinfob.Attributes.ToString());
   }
}
Myfieldinfo.Main();

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
FieldInfo クラス
FieldInfo メンバ
System.Reflection 名前空間
FieldAttributes 列挙体
Type

_FieldInfo.IsFamily プロパティ

メモ : このプロパティは、.NET Framework version 2.0 で新しく追加されたものです。

COM オブジェクトに、IsFamily プロパティへのバージョンに依存しないアクセスが用意されています。

このプロパティは、CLS に準拠していません。

名前空間: System.Runtime.InteropServices
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

ReadOnly Property IsFamily As
 Boolean

Visual Basic (使用法)

Dim instance As _FieldInfo
Dim value As Boolean

value = instance.IsFamily

bool IsFamily { get; }

C++

property bool IsFamily {
    bool get ();
}

/** @property */
boolean get_IsFamily ()

JScript

function get IsFamily () : boolean

プロパティ値
フィールドに Family 属性が設定されている場合は true。それ以外の場合は false。

解説

このプロパティは、アンマネージコードからマネージクラスにアクセスするためのプロパティであるため、マネージコードからは呼び出さないでください。

IsFamily プロパティは、このフィールドに Family レベルの参照範囲が設定されているかどうかを示す値を取得します。

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0

参照

関連項目
_FieldInfo インターフェイス
_FieldInfo メンバ
System.Runtime.InteropServices 名前空間

>> 「_FieldInfo.IsFamily」を含む用語の索引
_FieldInfo.IsFamilyのページへのリンク


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_FieldInfo.IsFamilyとは？ わかりやすく解説

FieldInfo.IsFamily プロパティ

_FieldInfo.IsFamily プロパティ

急上昇のことば

_FieldInfo.IsFamilyとは？わかりやすく解説