Type.IsValueTypeImpl-Methode

Implementiert die IsValueType-Eigenschaft und bestimmt, ob Type ein Werttyp ist, also weder eine Klasse noch eine Schnittstelle.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Protected Overridable Function IsValueTypeImpl As Boolean
'Usage
Dim returnValue As Boolean

returnValue = Me.IsValueTypeImpl

protected virtual bool IsValueTypeImpl ()

protected:
virtual bool IsValueTypeImpl ()

protected boolean IsValueTypeImpl ()

protected function IsValueTypeImpl () : boolean

Rückgabewert

true, wenn Type ein Werttyp ist, andernfalls false.

Hinweise

Werttypen beschreiben Werte, die als Bitfolgen dargestellt werden. Klassen oder Schnittstellen sind keine Werttypen. In einigen Programmiersprachen werden solche Typen als "Struct" bezeichnet. Enumerationen sind Werttypen.

Beispiel

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

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);
      }
   }
}

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 );
   }

}

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

Plattformen

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

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

.NET Compact Framework

Unterstützt in: 2.0, 1.0

Siehe auch

Referenz

Type-Klasse
Type-Member
System-Namespace
TypeAttributes
IsClass
IsInterface
ValueType
IsValueType