_FieldInfo.IsAssembly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.IsAssembly プロパティ

このフィールドに、アセンブ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
 IsAssembly As Boolean

Visual Basic (使用法)

Dim instance As FieldInfo
Dim value As Boolean

value = instance.IsAssembly

public bool IsAssembly { get;
 }

C++

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

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

JScript

public final function get
 IsAssembly () : boolean

プロパティ値
フィールドに Assembly 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

フィールドに Assembly レベルの参照可能範囲が設定されている場合、そのフィールドはアセンブリ内のすべてのメンバから呼び出せますが、アセンブリ外部からは呼び出せません。

IsAssembly プロパティは、FieldAttributes.Assembly 属性が設定されたときに設定されます。C# では、フィールドを internal として宣言することで、このフィールドのアクセスをこのプロジェクトに制限するよう、このプロパティを設定できます。

使用例

指定したフィールドにアセンブリレベルの参照可能範囲が指定されているかどうかを確認し、その結果を表示する例を次に示します。

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 MyField
        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
    Friend field As String
 = "B Friend field"

    Public Property MyField() As
 String
        Get
            Return MyField
        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 IsAssembly.
        Console.Write(ControlChars.Lf & "{0} - ",
 MyTypea.FullName)
        Console.Write("{0};", Myfieldinfoa.GetValue(Myfielda))
        Console.Write(" IsAssembly = {0}; ", Myfieldinfoa.IsAssembly)
        If Myfieldinfoa.IsAssembly Then
            Console.Write("Field has limited accessibility")
        End If
        'For the second field, get and display the name, field, and
 IsAssembly.
        Console.Write(ControlChars.Lf & "{0} - ",
 MyTypeb.FullName)
        Console.Write("{0}; ", Myfieldinfob.GetValue(Myfieldb))
        Console.Write(" IsAssembly = {0}; ", Myfieldinfob.IsAssembly)
        If Myfieldinfob.IsAssembly Then
            Console.Write("Field has limited accessibility")
        End If
        Return 0
    End Function 'Main
End Class 'Myfieldinfo

//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
{
   internal string field = "B internal 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 IsAssembly.
      Console.Write("\n{0} - ", MyTypea.FullName);
      Console.Write("{0};", Myfieldinfoa.GetValue(Myfielda));
      Console.Write(" IsAssembly = {0}; ", Myfieldinfoa.IsAssembly );
      if (Myfieldinfoa.IsAssembly)
         Console.Write("Field has limited accessibility");
 
      //For the second field, get and display the name, field, and IsAssembly.

      Console.Write("\n{0} - ", MyTypeb.FullName);
      Console.Write("{0}; ", Myfieldinfob.GetValue(Myfieldb));
      Console.Write(" IsAssembly = {0}; ", Myfieldinfob.IsAssembly );
      if (Myfieldinfob.IsAssembly)
         Console.Write("Field has limited accessibility");
 
      return 0;
   }
}

C++

//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
{
public private:
   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 IsAssembly.
   Console::Write( "\n{0} - ", MyTypea->FullName );
   Console::Write( "{0};", Myfieldinfoa->GetValue( myfielda ) );
   Console::Write( " IsAssembly = {0}; ", Myfieldinfoa->IsAssembly );
   if ( Myfieldinfoa->IsAssembly )
      Console::Write( "Field has limited accessibility" );

   
   //For the second field, get and display the name, field, and IsAssembly.
   Console::Write( "\n{0} - ", MyTypeb->FullName );
   Console::Write( "{0}; ", Myfieldinfob->GetValue( myfieldb ) );
   Console::Write( " IsAssembly = {0}; ", Myfieldinfob->IsAssembly );
   if ( Myfieldinfob->IsAssembly )
      Console::Write( "Field has limited accessibility" );

   return 0;
}

//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
{
    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
 IsAssembly.
        Console.Write("\n{0} - ", myTypeA.get_FullName());
        Console.Write("{0};", myFieldInfoA.GetValue(myFieldA));
        Console.Write(" IsAssembly = {0}; ", 
            (System.Boolean)myFieldInfoA.get_IsAssembly());
        if (myFieldInfoA.get_IsAssembly()) {
            Console.Write("Field has limited accessibility");
        }

        //For the second field, get and display the name, field, and
 IsAssembly.
        Console.Write("\n{0} - ", myTypeB.get_FullName());
        Console.Write("{0}; ", myFieldInfoB.GetValue(myFieldB));
        Console.Write(" IsAssembly = {0}; ", 
            (System.Boolean)myFieldInfoB.get_IsAssembly());
        if (myFieldInfoB.get_IsAssembly()) {
            Console.Write("Field has limited accessibility");
        }

        return;
    } //main
} //MyFieldInfo

JScript

//Make two fields.
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
{
   internal 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 IsAssembly.
      Console.Write("\n{0} - ", MyTypea.FullName);
      Console.Write("{0};", Myfieldinfoa.GetValue(myfielda));
      Console.Write(" IsAssembly = {0}; ", Myfieldinfoa.IsAssembly );
      if (Myfieldinfoa.IsAssembly)
         Console.Write("Field has limited accessibility");
 
      //For the second field, get and display the name, field, and IsAssembly.

      Console.Write("\n{0} - ", MyTypeb.FullName);
      Console.Write("{0}; ", Myfieldinfob.GetValue(myfieldb));
      Console.Write(" IsAssembly = {0}; ", Myfieldinfob.IsAssembly );
      if (Myfieldinfob.IsAssembly)
         Console.Write("Field has limited accessibility");
   }
}
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

_FieldInfo.IsAssembly 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、IsAssembly 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 IsAssembly As
 Boolean

Visual Basic (使用法)

Dim instance As _FieldInfo
Dim value As Boolean

value = instance.IsAssembly

bool IsAssembly { get; }

C++

property bool IsAssembly {
    bool get ();
}

/** @property */
boolean get_IsAssembly ()

JScript

function get IsAssembly () : boolean

プロパティ値
フィールドに Assembly 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。

IsAssembly プロパティは、このフィールドに Assembly 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.IsAssembly」を含む用語の索引
_FieldInfo.IsAssemblyのページへのリンク


	© 2025 Microsoft.All rights reserved.

_FieldInfo.IsAssemblyとは？ わかりやすく解説

FieldInfo.IsAssembly プロパティ

_FieldInfo.IsAssembly プロパティ

急上昇のことば

_FieldInfo.IsAssemblyとは？わかりやすく解説