IDisposable和COM

Question

由於COM對象持有非內存資源但不支持IDisposable，因此我嘗試了一些想法來僞造它。你對我的第一次嘗試有什麼看法？

Public Function ComBlock(ByVal ParamArray comObjects As Object()) As IDisposable 
    For i As Integer = 0 To comObjects.Length - 1 
     If comObjects(i) Is Nothing Then Throw New ArgumentNullException("Null in parameter " & i) 
     If Not Marshal.IsComObject(comObjects(i)) Then Throw New ArgumentException(comObjects(i).GetType.Name & " is not a COM object") 
    Next 

    Return New ComContext(comObjects) 
End Function 

Private Class ComContext : Implements IDisposable 
    Private m_ComObjects As Object() 
    Private m_Disposed As Boolean 

    Sub New(ByVal comObjects As Object()) 
     m_ComObjects = comObjects 
    End Sub 

    Private Sub Dispose() Implements IDisposable.Dispose 
     For Each item In m_ComObjects 
      Marshal.FinalReleaseComObject(item) 
     Next 

     GC.SuppressFinalize(Me) 
    End Sub 

End Class 

Answer 1

我喜歡你要去哪裏的想法。我更傾向於在IDisposable類型中使用COM對象，其中類型公開COM對象的公共成員（認爲：Adapter）。然後，類中的Dispose（）方法將處理COM對象的垃圾回收。

如果你使用了很多COM對象，你可以從一個基類繼承來處理這個處理。我一直沒有測試過這個代碼，但這通常是我在想什麼......

public abstract class COMAdapter : IDisposable { 

    protected abstract object COMObject { get; } 

    public void Dispose() { 
     Marshal.FinalReleaseComObject(COMObject); 
     GC.SuppressFinalize(this); 
    } 
} 

public class ConcreteAdapter : COMAdapter { 
    private YourCOMType _comObject; 

    protected override object COMObject { 
     get { return _comObject; } 
    } 
}