IDisposable IDisposable IDisposable IDisposable Interface

Definição

Fornece um mecanismo para liberar recursos não gerenciados.Provides a mechanism for releasing unmanaged resources.

public interface class IDisposable
[System.Runtime.InteropServices.ComVisible(true)]
public interface IDisposable
type IDisposable = interface
Public Interface IDisposable
Derivado
Atributos

Exemplos

O exemplo a seguir demonstra como criar uma classe de recurso que implementa o IDisposable interface.The following example demonstrates how to create a resource class that implements the IDisposable interface.

#using <System.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::ComponentModel;
using namespace System::Windows::Forms;

// The following example demonstrates how to create a class that 
// implements the IDisposable interface and the IDisposable.Dispose
// method with finalization to clean up unmanaged resources. 
//
public ref class MyResource: public IDisposable
{
private:

   // Pointer to an external unmanaged resource.
   IntPtr handle;

   // A managed resource this class uses.
   Component^ component;

   // Track whether Dispose has been called.
   bool disposed;

public:
   // The class constructor.
   MyResource( IntPtr handle, Component^ component )
   {
      this->handle = handle;
      this->component = component;
      disposed = false;
   }

   // This method is called if the user explicitly disposes of the
   // object (by calling the Dispose method in other managed languages, 
   // or the destructor in C++). The compiler emits as a call to 
   // GC::SuppressFinalize( this ) for you, so there is no need to 
   // call it here.
   ~MyResource() 
   {
      // Dispose of managed resources.
      component->~Component();

      // Call C++ finalizer to clean up unmanaged resources.
      this->!MyResource();

      // Mark the class as disposed. This flag allows you to throw an
      // exception if a disposed object is accessed.
      disposed = true;
   }

   // Use interop to call the method necessary to clean up the 
   // unmanaged resource.
   //
   [System::Runtime::InteropServices::DllImport("Kernel32")]
   static Boolean CloseHandle( IntPtr handle );

   // The C++ finalizer destructor ensures that unmanaged resources get
   // released if the user releases the object without explicitly 
   // disposing of it.
   //
   !MyResource()
   {      
      // Call the appropriate methods to clean up unmanaged 
      // resources here. If disposing is false when Dispose(bool,
      // disposing) is called, only the following code is executed.
      CloseHandle( handle );
      handle = IntPtr::Zero;
   }

};

void main()
{
   // Insert code here to create and use the MyResource object.
   MyResource^ mr = gcnew MyResource((IntPtr) 42, (Component^) gcnew Button());
   mr->~MyResource();
}
using System;
using System.ComponentModel;

// The following example demonstrates how to create
// a resource class that implements the IDisposable interface
// and the IDisposable.Dispose method.

public class DisposeExample
{
    // A base class that implements IDisposable.
    // By implementing IDisposable, you are announcing that
    // instances of this type allocate scarce resources.
    public class MyResource: IDisposable
    {
        // Pointer to an external unmanaged resource.
        private IntPtr handle;
        // Other managed resource this class uses.
        private Component component = new Component();
        // Track whether Dispose has been called.
        private bool disposed = false;

        // The class constructor.
        public MyResource(IntPtr handle)
        {
            this.handle = handle;
        }

        // Implement IDisposable.
        // Do not make this method virtual.
        // A derived class should not be able to override this method.
        public void Dispose()
        {
            Dispose(true);
            // This object will be cleaned up by the Dispose method.
            // Therefore, you should call GC.SupressFinalize to
            // take this object off the finalization queue
            // and prevent finalization code for this object
            // from executing a second time.
            GC.SuppressFinalize(this);
        }

        // Dispose(bool disposing) executes in two distinct scenarios.
        // If disposing equals true, the method has been called directly
        // or indirectly by a user's code. Managed and unmanaged resources
        // can be disposed.
        // If disposing equals false, the method has been called by the
        // runtime from inside the finalizer and you should not reference
        // other objects. Only unmanaged resources can be disposed.
        protected virtual void Dispose(bool disposing)
        {
            // Check to see if Dispose has already been called.
            if(!this.disposed)
            {
                // If disposing equals true, dispose all managed
                // and unmanaged resources.
                if(disposing)
                {
                    // Dispose managed resources.
                    component.Dispose();
                }

                // Call the appropriate methods to clean up
                // unmanaged resources here.
                // If disposing is false,
                // only the following code is executed.
                CloseHandle(handle);
                handle = IntPtr.Zero;

                // Note disposing has been done.
                disposed = true;

            }
        }

        // Use interop to call the method necessary
        // to clean up the unmanaged resource.
        [System.Runtime.InteropServices.DllImport("Kernel32")]
        private extern static Boolean CloseHandle(IntPtr handle);

        // Use C# destructor syntax for finalization code.
        // This destructor will run only if the Dispose method
        // does not get called.
        // It gives your base class the opportunity to finalize.
        // Do not provide destructors in types derived from this class.
        ~MyResource()
        {
            // Do not re-create Dispose clean-up code here.
            // Calling Dispose(false) is optimal in terms of
            // readability and maintainability.
            Dispose(false);
        }
    }
    public static void Main()
    {
        // Insert code here to create
        // and use the MyResource object.
    }
}
Imports System
Imports System.ComponentModel

' The following example demonstrates how to create
' a resource class that implements the IDisposable interface
' and the IDisposable.Dispose method.
Public Class DisposeExample

   ' A class that implements IDisposable.
   ' By implementing IDisposable, you are announcing that 
   ' instances of this type allocate scarce resources.
   Public Class MyResource
      Implements IDisposable
      ' Pointer to an external unmanaged resource.
      Private handle As IntPtr
      ' Other managed resource this class uses.
      Private component As component
      ' Track whether Dispose has been called.
      Private disposed As Boolean = False

      ' The class constructor.
      Public Sub New(ByVal handle As IntPtr)
         Me.handle = handle
      End Sub

      ' Implement IDisposable.
      ' Do not make this method virtual.
      ' A derived class should not be able to override this method.
      Public Overloads Sub Dispose() Implements IDisposable.Dispose
         Dispose(True)
         ' This object will be cleaned up by the Dispose method.
         ' Therefore, you should call GC.SupressFinalize to
         ' take this object off the finalization queue 
         ' and prevent finalization code for this object
         ' from executing a second time.
         GC.SuppressFinalize(Me)
      End Sub

      ' Dispose(bool disposing) executes in two distinct scenarios.
      ' If disposing equals true, the method has been called directly
      ' or indirectly by a user's code. Managed and unmanaged resources
      ' can be disposed.
      ' If disposing equals false, the method has been called by the 
      ' runtime from inside the finalizer and you should not reference 
      ' other objects. Only unmanaged resources can be disposed.
      Protected Overridable Overloads Sub Dispose(ByVal disposing As Boolean)
         ' Check to see if Dispose has already been called.
         If Not Me.disposed Then
            ' If disposing equals true, dispose all managed 
            ' and unmanaged resources.
            If disposing Then
               ' Dispose managed resources.
               component.Dispose()
            End If

            ' Call the appropriate methods to clean up 
            ' unmanaged resources here.
            ' If disposing is false, 
            ' only the following code is executed.
            CloseHandle(handle)
            handle = IntPtr.Zero

            ' Note disposing has been done.
            disposed = True

         End If
      End Sub

      ' Use interop to call the method necessary  
      ' to clean up the unmanaged resource.
      <System.Runtime.InteropServices.DllImport("Kernel32")> _
      Private Shared Function CloseHandle(ByVal handle As IntPtr) As [Boolean]
      End Function

      ' This finalizer will run only if the Dispose method 
      ' does not get called.
      ' It gives your base class the opportunity to finalize.
      ' Do not provide finalize methods in types derived from this class.
      Protected Overrides Sub Finalize()
         ' Do not re-create Dispose clean-up code here.
         ' Calling Dispose(false) is optimal in terms of
         ' readability and maintainability.
         Dispose(False)
         MyBase.Finalize()
      End Sub
   End Class

   Public Shared Sub Main()
      ' Insert code here to create
      ' and use the MyResource object.
   End Sub

End Class

Comentários

O principal uso dessa interface é liberar recursos não gerenciados.The primary use of this interface is to release unmanaged resources. O coletor de lixo automaticamente libera a memória alocada para um objeto gerenciado quando esse objeto não é mais usado.The garbage collector automatically releases the memory allocated to a managed object when that object is no longer used. No entanto, não é possível prever quando ocorrerá a coleta de lixo.However, it is not possible to predict when garbage collection will occur. Além disso, o coletor de lixo não tem conhecimento dos recursos não gerenciados, como identificadores de janela ou abrir arquivos e fluxos.Furthermore, the garbage collector has no knowledge of unmanaged resources such as window handles, or open files and streams.

Use o método Dispose dessa interface explicitamente para liberar recursos não gerenciados em conjunto com o coletor de lixo.Use the Dispose method of this interface to explicitly release unmanaged resources in conjunction with the garbage collector. O consumidor de um objeto pode chamar esse método quando o objeto não for mais necessário.The consumer of an object can call this method when the object is no longer needed.

Aviso

É uma alteração significativa para adicionar o IDisposable interface para uma classe existente.It is a breaking change to add the IDisposable interface to an existing class. Porque já existente de consumidores do seu tipo não é possível chamar Dispose, você não pode ter certeza de que recursos não gerenciados mantidos pelo seu tipo serão liberados.Because pre-existing consumers of your type cannot call Dispose, you cannot be certain that unmanaged resources held by your type will be released.

Porque o IDisposable.Dispose implementação é chamada pelo consumidor de um tipo quando os recursos pertencentes a uma instância não são mais necessários, ou você deve encapsular o objeto gerenciado em um SafeHandle (a alternativa recomendada), ou você deve substituir Object.Finalizeliberar recursos não gerenciados que o consumidor esquece de chamar Dispose.Because the IDisposable.Dispose implementation is called by the consumer of a type when the resources owned by an instance are no longer needed, you should either wrap the managed object in a SafeHandle (the recommended alternative), or you should override Object.Finalize to free unmanaged resources in the event that the consumer forgets to call Dispose.

Importante

No .NET Framework, o compilador C++ oferece suporte a descarte determinística de recursos e não permite a implementação direta do Dispose método.In the .NET Framework, the C++ compiler supports deterministic disposal of resources and does not allow direct implementation of the Dispose method.

Para uma discussão detalhada sobre como essa interface e o Object.Finalize método são usados, consulte a coleta de lixo e implementando um método Dispose tópicos.For a detailed discussion about how this interface and the Object.Finalize method are used, see the Garbage Collection and Implementing a Dispose Method topics.

Usando um objeto que implementa IDisposableUsing an object that implements IDisposable

Se seu aplicativo simplesmente usa um objeto que implementa o IDisposable interface, você deve chamar o objeto IDisposable.Dispose implementação quando tiver terminado de usá-lo.If your app simply uses an object that implements the IDisposable interface, you should call the object's IDisposable.Dispose implementation when you are finished using it. Dependendo da sua linguagem de programação, você pode fazer isso de duas maneiras:Depending on your programming language, you can do this in one of two ways:

  • Usando uma linguagem como construir o using instrução em c# e Visual Basic.By using a language construct such as the using statement in C# and Visual Basic.

  • Encapsulando a chamada para o IDisposable.Dispose implementação em um try / finally bloco.By wrapping the call to the IDisposable.Dispose implementation in a try/finally block.

Observação

Documentação para tipos que implementam IDisposable Anote esse fato e incluir um lembrete para chamar sua Dispose implementação.Documentation for types that implement IDisposable note that fact and include a reminder to call its Dispose implementation.

A instrução c# e Visual Basic usandoThe C# and Visual Basic Using statement

Se o seu idioma oferece suporte a uma construção, como o usando instrução em c# e o Using instrução no Visual Basic, você pode usá-lo em vez de chamar explicitamente IDisposable.Dispose por conta própria.If your language supports a construct such as the using statement in C# and the Using statement in Visual Basic, you can use it instead of explicitly calling IDisposable.Dispose yourself. O exemplo a seguir usa essa abordagem na definição de um WordCount classe que preserva as informações sobre um arquivo e o número de palavras nele.The following example uses this approach in defining a WordCount class that preserves information about a file and the number of words in it.

using System;
using System.IO;
using System.Text.RegularExpressions;

public class WordCount
{
   private String filename = String.Empty;
   private int nWords = 0;
   private String pattern = @"\b\w+\b"; 

   public WordCount(string filename)
   {
      if (! File.Exists(filename))
         throw new FileNotFoundException("The file does not exist.");
      
      this.filename = filename;
      string txt = String.Empty;
      using (StreamReader sr = new StreamReader(filename)) {
         txt = sr.ReadToEnd();
      }
      nWords = Regex.Matches(txt, pattern).Count;
   }
   
   public string FullName
   { get { return filename; } }
   
   public string Name
   { get { return Path.GetFileName(filename); } }
   
   public int Count 
   { get { return nWords; } }
}   
Imports System.IO
Imports System.Text.RegularExpressions

Public Class WordCount
   Private filename As String
   Private nWords As Integer
   Private pattern As String = "\b\w+\b" 

   Public Sub New(filename As String)
      If Not File.Exists(filename) Then
         Throw New FileNotFoundException("The file does not exist.")
      End If   
      
      Me.filename = filename
      Dim txt As String = String.Empty
      Using sr As New StreamReader(filename)
         txt = sr.ReadToEnd()
      End Using
      nWords = Regex.Matches(txt, pattern).Count
   End Sub
   
   Public ReadOnly Property FullName As String
      Get
         Return filename
      End Get   
   End Property
   
   Public ReadOnly Property Name As String
      Get
         Return Path.GetFileName(filename)
      End Get   
   End Property
   
   Public ReadOnly Property Count As Integer
      Get
         Return nWords
      End Get
   End Property
End Class

O using instrução é realmente uma conveniência sintática.The using statement is actually a syntactic convenience. Em tempo de compilação, o compilador de linguagem implementa a IL (linguagem intermediária) para um try / finally bloco.At compile time, the language compiler implements the intermediate language (IL) for a try/finally block.

Para obter mais informações sobre o using instrução, consulte a instrução Using ou usando a instrução tópicos.For more information about the using statement, see the Using Statement or using Statement topics.

O bloco Try/FinallyThe Try/Finally block

Se sua linguagem de programação não oferece suporte a uma construção semelhante a using instrução em c# ou Visual Basic, ou se você preferir não usá-lo, você pode chamar o IDisposable.Dispose implementação da finally block de um try / finally instrução.If your programming language does not support a construct like the using statement in C# or Visual Basic, or if you prefer not to use it, you can call the IDisposable.Dispose implementation from the finally block of a try/finally statement. O exemplo a seguir substitui o using bloquear no exemplo anterior com um try / finally bloco.The following example replaces the using block in the previous example with a try/finally block.

using System;
using System.IO;
using System.Text.RegularExpressions;

public class WordCount
{
   private String filename = String.Empty;
   private int nWords = 0;
   private String pattern = @"\b\w+\b"; 

   public WordCount(string filename)
   {
      if (! File.Exists(filename))
         throw new FileNotFoundException("The file does not exist.");
      
      this.filename = filename;
      string txt = String.Empty;
      StreamReader sr = null;
      try {
         sr = new StreamReader(filename);
         txt = sr.ReadToEnd();
      }
      finally {
         if (sr != null) sr.Dispose();     
      }
      nWords = Regex.Matches(txt, pattern).Count;
   }
   
   public string FullName
   { get { return filename; } }
   
   public string Name
   { get { return Path.GetFileName(filename); } }
   
   public int Count 
   { get { return nWords; } }
}   
Imports System.IO
Imports System.Text.RegularExpressions

Public Class WordCount
   Private filename As String
   Private nWords As Integer
   Private pattern As String = "\b\w+\b" 

   Public Sub New(filename As String)
      If Not File.Exists(filename) Then
         Throw New FileNotFoundException("The file does not exist.")
      End If   
      
      Me.filename = filename
      Dim txt As String = String.Empty
      Dim sr As StreamReader = Nothing
      Try
         sr = New StreamReader(filename)
         txt = sr.ReadToEnd()
      Finally
         If sr IsNot Nothing Then sr.Dispose() 
      End Try
      nWords = Regex.Matches(txt, pattern).Count
   End Sub
   
   Public ReadOnly Property FullName As String
      Get
         Return filename
      End Get   
   End Property
   
   Public ReadOnly Property Name As String
      Get
         Return Path.GetFileName(filename)
      End Get   
   End Property
   
   Public ReadOnly Property Count As Integer
      Get
         Return nWords
      End Get
   End Property
End Class

Para obter mais informações sobre o try / finally padrão, consulte tente... Catch... Instrução Finally, try-finally, ou instrução try-finally.For more information about the try/finally pattern, see Try...Catch...Finally Statement, try-finally, or try-finally Statement.

Implementando IDisposableImplementing IDisposable

Você deve implementar IDisposable somente se seu tipo usa os recursos não gerenciados diretamente.You should implement IDisposable only if your type uses unmanaged resources directly. Os consumidores do seu tipo podem chamar seu IDisposable.Dispose implementação para liberar recursos quando a instância não for mais necessário.The consumers of your type can call your IDisposable.Dispose implementation to free resources when the instance is no longer needed. Para lidar com casos em que eles não chame Dispose, você deve usar uma classe derivada de SafeHandle encapsular os recursos não gerenciados, ou você deve substituir o Object.Finalize método para um tipo de referência.To handle cases in which they fail to call Dispose, you should either use a class derived from SafeHandle to wrap the unmanaged resources, or you should override the Object.Finalize method for a reference type. Em ambos os casos, você deve usar o Dispose método para executar qualquer limpeza é necessária depois de usar os recursos não gerenciados, como liberar, liberar ou redefinir os recursos não gerenciados.In either case, you use the Dispose method to perform whatever cleanup is necessary after using the unmanaged resources, such as freeing, releasing, or resetting the unmanaged resources.

Importante

Se você estiver definindo uma classe base que usa recursos não gerenciados e que tenha ou é a probabilidade de ter subclasses que devem ser descartadas, você deve implementar o IDisposable.Dispose método e forneça uma segunda sobrecarga de Dispose, conforme discutido na próxima seção.If you are defining a base class that uses unmanaged resources and that either has, or is likely to have, subclasses that should be disposed, you should implement the IDisposable.Dispose method and provide a second overload of Dispose, as discussed in the next section.

IDisposable e a hierarquia de herançaIDisposable and the inheritance hierarchy

Uma classe base com subclasses que devem ser descartáveis deve implementar IDisposable da seguinte maneira.A base class with subclasses that should be disposable must implement IDisposable as follows. Você deve usar esse padrão sempre que você implemente IDisposable em qualquer tipo que não seja sealed (NotInheritable no Visual Basic).You should use this pattern whenever you implement IDisposable on any type that isn't sealed (NotInheritable in Visual Basic).

  • Ele deve fornecer uma pública não virtual Dispose() um protegidos e método virtual Dispose(Boolean disposing) método.It should provide one public, non-virtual Dispose() method and a protected virtual Dispose(Boolean disposing) method.

  • O Dispose() método deve chamar Dispose(true) e deve suprimir a finalização para o desempenho.The Dispose() method must call Dispose(true) and should suppress finalization for performance.

  • O tipo base não deve incluir finalizadores.The base type should not include any finalizers.

O fragmento de código a seguir reflete o padrão de descarte para classes base.The following code fragment reflects the dispose pattern for base classes. Ele pressupõe que seu tipo não substitui o Object.Finalize método.It assumes that your type does not override the Object.Finalize method.

using Microsoft.Win32.SafeHandles;
using System;
using System.Runtime.InteropServices;

class BaseClass : IDisposable
{
   // Flag: Has Dispose already been called?
   bool disposed = false;
   // Instantiate a SafeHandle instance.
   SafeHandle handle = new SafeFileHandle(IntPtr.Zero, true);
   
   // Public implementation of Dispose pattern callable by consumers.
   public void Dispose()
   { 
      Dispose(true);
      GC.SuppressFinalize(this);           
   }
   
   // Protected implementation of Dispose pattern.
   protected virtual void Dispose(bool disposing)
   {
      if (disposed)
         return; 
      
      if (disposing) {
         handle.Dispose();
         // Free any other managed objects here.
         //
      }
      
      disposed = true;
   }
}
Imports Microsoft.Win32.SafeHandles
Imports System.Runtime.InteropServices

Class BaseClass : Implements IDisposable
   ' Flag: Has Dispose already been called?
   Dim disposed As Boolean = False
   ' Instantiate a SafeHandle instance.
   Dim handle As SafeHandle = New SafeFileHandle(IntPtr.Zero, True)

   ' Public implementation of Dispose pattern callable by consumers.
   Public Sub Dispose() _
              Implements IDisposable.Dispose
      Dispose(True)
      GC.SuppressFinalize(Me)           
   End Sub
   
   ' Protected implementation of Dispose pattern.
   Protected Overridable Sub Dispose(disposing As Boolean)
      If disposed Then Return
      
      If disposing Then
         handle.Dispose()
         ' Free any other managed objects here.
         '
      End If
      
      disposed = True
   End Sub
End Class

Se você substituir o Object.Finalize método, sua classe deve implementar o padrão a seguir.If you do override the Object.Finalize method, your class should implement the following pattern.

using System;

class BaseClass : IDisposable
{
   // Flag: Has Dispose already been called?
   bool disposed = false;
   
   // Public implementation of Dispose pattern callable by consumers.
   public void Dispose()
   { 
      Dispose(true);
      GC.SuppressFinalize(this);           
   }
   
   // Protected implementation of Dispose pattern.
   protected virtual void Dispose(bool disposing)
   {
      if (disposed)
         return; 
      
      if (disposing) {
         // Free any other managed objects here.
         //
      }
      
      // Free any unmanaged objects here.
      //
      disposed = true;
   }

   ~BaseClass()
   {
      Dispose(false);
   }
}
Class BaseClass : Implements IDisposable
   ' Flag: Has Dispose already been called?
   Dim disposed As Boolean = False
   
   ' Public implementation of Dispose pattern callable by consumers.
   Public Sub Dispose() _
              Implements IDisposable.Dispose
      Dispose(True)
      GC.SuppressFinalize(Me)           
   End Sub
   
   ' Protected implementation of Dispose pattern.
   Protected Overridable Sub Dispose(disposing As Boolean)
      If disposed Then Return
      
      If disposing Then
         ' Free any other managed objects here.
         '
      End If
      
      ' Free any unmanaged objects here.
      '
      disposed = True
   End Sub

   Protected Overrides Sub Finalize()
      Dispose(False)      
   End Sub
End Class

As subclasses devem implementar o padrão descartável desta maneira:Subclasses should implement the disposable pattern as follows:

  • Elas devem substituir Dispose(Boolean) e chamar a implementação Dispose(Boolean) da classe base.They must override Dispose(Boolean) and call the base class Dispose(Boolean) implementation.

  • Podem fornecer um finalizador, se necessário.They can provide a finalizer if needed. O finalizador deve chamar Dispose(false).The finalizer must call Dispose(false).

Observe que classes derivadas não em si implementa o IDisposable da interface e não incluem um sem parâmetros Dispose método.Note that derived classes do not themselves implement the IDisposable interface and do not include a parameterless Dispose method. Eles apenas substituem a classe base Dispose(Boolean) método.They only override the base class Dispose(Boolean) method.

O fragmento de código a seguir reflete o padrão de descarte para classes derivadas.The following code fragment reflects the dispose pattern for derived classes. Ele pressupõe que seu tipo não substitui o Object.Finalize método.It assumes that your type does not override the Object.Finalize method.

using Microsoft.Win32.SafeHandles;
using System;
using System.Runtime.InteropServices;

class DerivedClass : BaseClass
{
   // Flag: Has Dispose already been called?
   bool disposed = false;
   // Instantiate a SafeHandle instance.
   SafeHandle handle = new SafeFileHandle(IntPtr.Zero, true);

   // Protected implementation of Dispose pattern.
   protected override void Dispose(bool disposing)
   {
      if (disposed)
         return; 
      
      if (disposing) {
         handle.Dispose();
         // Free any other managed objects here.
         //
      }
      
      // Free any unmanaged objects here.
      //

      disposed = true;
      // Call base class implementation.
      base.Dispose(disposing);
   }
}
Imports Microsoft.Win32.SafeHandles
Imports System.Runtime.InteropServices

Class DerivedClass : Inherits BaseClass 
   ' Flag: Has Dispose already been called?
   Dim disposed As Boolean = False
   ' Instantiate a SafeHandle instance.
   Dim handle As SafeHandle = New SafeFileHandle(IntPtr.Zero, True)

   ' Protected implementation of Dispose pattern.
   Protected Overrides Sub Dispose(disposing As Boolean)
      If disposed Then Return
      
      If disposing Then
         handle.Dispose()
         ' Free any other managed objects here.
         '
      End If
      
      ' Free any unmanaged objects here.
      '
      disposed = True
      
      ' Call base class implementation.
      MyBase.Dispose(disposing)
   End Sub
End Class

Métodos

Dispose() Dispose() Dispose() Dispose()

Realiza tarefas definidas pelo aplicativo associadas à liberação ou à redefinição de recursos não gerenciados.Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

Aplica-se a

Veja também