Type.IsValueTypeImpl メソッド

.NET Framework クラス ライブラリ リファレンス

Type.IsValueTypeImpl メソッド

IsValueType プロパティを実装し、Type が値型であり、クラスやインターフェイスでないかどうかを判断します。

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

Visual Basic (宣言)

Protected Overridable Function
 IsValueTypeImpl As Boolean

Visual Basic (使用法)

Dim returnValue As Boolean

returnValue = Me.IsValueTypeImpl

C#

protected virtual bool IsValueTypeImpl ()

C++

protected:
virtual bool IsValueTypeImpl ()

J#

protected boolean IsValueTypeImpl ()

JScript

protected function IsValueTypeImpl () : boolean

戻り値
Type が値型である場合は true。それ以外の場合は false。

解説

値型とは、ビットの連続で表される値のことです。値型は、クラスやインターフェイスではありません。この値型は、一部のプログラミング言語では "構造体" と呼ばれます。列挙型 (Enum) は値型の 1 つです。

使用例

Visual Basic

Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic

Public Class MyTypeDelegator
   Inherits TypeDelegator
   Public myElementType As String
 = Nothing
   Private myType As Type = Nothing
   
   Public Sub New(myType
 As Type)
      MyBase.New(myType)
      Me.myType = myType
   End Sub 'New
   
   ' Override the IsValueTypeImpl() method of the Type class.
   Protected Overrides Function
 IsValueTypeImpl() As Boolean
      ' Determine whether the type is a value type.
      If myType.IsValueType Then
         myElementType = "value"
         Return True
      End If
      ' The type is not a value type.
      Return False
   End Function 'IsValueTypeImpl
End Class 'MyTypeDelegator

Public Class Type_IsValueTypeImpl

   Public Class MyClass1
   End Class 'MyClass1
   
   Public Shared Sub Main()
      Try
         Dim myInt As Integer
 = 0
         Dim myClass1 As New
 MyClass1()
         
         Dim myType As New
 MyTypeDelegator(myInt.GetType())
         Console.WriteLine(ControlChars.NewLine + "Determine whether
 a variable refers to a value type." + ControlChars.NewLine)
         
         ' Determine whether 'myType' is a value type.  
         If myType.IsValueType Then
            Console.WriteLine(ControlChars.NewLine + "'myInt' is
 a {0} type.", myType.myElementType)
         Else
            Console.WriteLine(ControlChars.NewLine + "'myInt' is
 not a value type.")
         End If 
         myType = New MyTypeDelegator(myClass1.GetType())
         
         ' Determine whether 'myType' is a value type.  
         If myType.IsValueType Then
            Console.WriteLine(ControlChars.NewLine + "'myClass1'
 is a {0} type.", myType.myElementType)
         Else
            Console.WriteLine(ControlChars.NewLine + "'myClass1'
 is not a value type.")
         End If 
      Catch e As Exception
         Console.WriteLine(ControlChars.NewLine + "The following
 exception is raised:" + e.Message.ToString())
      End Try
   End Sub 'Main
End Class 'Type_IsValueTypeImpl

C#

using System;
using System.Reflection;

public class MyTypeDelegator : TypeDelegator
{
   public string myElementType = null;
   private Type myType = null ; 

   public MyTypeDelegator(Type myType) : base(myType)
   {
      this.myType = myType;
   }

   // Override 'IsValueTypeImpl()' method of 'Type' class.
   protected override bool IsValueTypeImpl()
   {
      // Determine whether the type is a value type.
      if(myType.IsValueType)
      {
         myElementType = "value";
         return true;
      }
      // The type is not value type.
      return false;
   }  
}
public class Type_IsValueTypeImpl 
{
   public class MyClass
   {
   }
   public static void Main()
   {
      try
      {
         int myInt = 0 ; 
         MyClass myClass = new MyClass ();

         MyTypeDelegator myType = new MyTypeDelegator(myInt.GetType());
         Console.WriteLine("\nCheck whether a variable refers to a value type.\n");
         
         // Determine whether 'myType' is a value type.  
         if( myType.IsValueType)
            Console.WriteLine("\n'myInt' is a {0} type.", myType.myElementType);
         else
            Console.WriteLine("\n'myInt' is not a value type.");

         myType = new MyTypeDelegator(myClass.GetType());

         // Determine whether 'myType' is a value type.  
         if( myType.IsValueType)
            Console.WriteLine("\n'myClass' is a {0} type.", myType.myElementType);
         else
            Console.WriteLine("\n'myClass' is not a value type.");

      }
      catch( Exception e )
      {
            Console.WriteLine("\nThe following exception is raised:" +e.Message);
      }
   }
}

C++

using namespace System;
using namespace System::Reflection;
public ref class MyTypeDelegator: public
 TypeDelegator
{
public:
   String^ myElementType;

private:
   Type^ myType;

public:
   MyTypeDelegator( Type^ myType )
      : TypeDelegator( myType )
   {
      this->myType = myType;
   }


protected:

   // Override 'IsValueTypeImpl()' method of 'Type' class.
   virtual bool IsValueTypeImpl() override 
   {
      
      // Determine whether the type is a value type.
      if ( myType->IsValueType )
      {
         myElementType = "value";
         return true;
      }

      
      // The type is not value type.
      return false;
   }

};

public ref class MyClass{};

int main()
{
   try
   {
      int myInt = 0;
      MyClass^ myClass = gcnew MyClass;
      MyTypeDelegator^ myType = gcnew MyTypeDelegator( myInt.GetType() );
      Console::WriteLine( "\nCheck whether a variable refers to a value type.\n"
 );
      
      // Determine whether 'myType' is a value type.
      if ( myType->IsValueType )
            Console::WriteLine( "\n'myInt' is a {0} type.", myType->myElementType
 );
      else
            Console::WriteLine( "\n'myInt' is not a value type." );
      myType = gcnew MyTypeDelegator( myClass->GetType() );
      
      // Determine whether 'myType' is a value type.
      if ( myType->IsValueType )
            Console::WriteLine( "\n'myClass' is a {0} type.", myType->myElementType
 );
      else
            Console::WriteLine( "\n'myClass' is not a value type." );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "\nThe following exception is raised: {0}", e->Message
 );
   }

}

J#

import System.*;
import System.Reflection.*;
public class MyTypeDelegator extends TypeDelegator
{
    public String myElementType = null;
    private Type myType = null;

    public MyTypeDelegator(Type myType)
    {
        super(myType);
        this.myType = myType;
    } //MyTypeDelegator

    // Override 'IsValueTypeImpl()' method of 'Type' class.
    protected boolean IsValueTypeImpl()
    {
        // Determine whether the type is a value type.
        if (myType.get_IsValueType()) {
            myElementType = "value";
            return true;
        }
        // The type is not value type.
        return false;
    } //IsValueTypeImpl
} //MyTypeDelegator

public class Type_IsValueTypeImpl
{
    static public class
 MyClass
    {
    } //MyClass

    public static void main(String[]
 args)
    {
        try {
            int myInt = 0;
            MyClass myClass = new MyClass();

            MyTypeDelegator myType = new MyTypeDelegator(((System.
                Int32)myInt).GetType());
            Console.WriteLine("\nCheck whether a variable refers to" 
                + " a value type.\n");
            // Determine whether 'myType' is a value type.  
            if (myType.get_IsValueType()) {
                Console.WriteLine("\n'myInt' is a {0} type.",
                    myType.myElementType);
            }
            else {
                Console.WriteLine("\n'myInt' is not a value type.");
            }
            myType = new MyTypeDelegator(myClass.GetType());
            // Determine whether 'myType' is a value type.  
            if (myType.get_IsValueType()) {
                Console.WriteLine("\n'myClass' is a {0} type.",
                    myType.myElementType);
            }
            else {
                Console.WriteLine("\n'myClass' is not a value type.");
            }
        }
        catch (System.Exception e)
        {
            Console.WriteLine("\nThe following exception is raised:" 
                + e.get_Message());
        }
    } //main
} //Type_IsValueTypeImpl

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
Type クラス
Type メンバ
System 名前空間
TypeAttributes
IsClass
IsInterface
ValueType
IsValueType