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これは C# で簡単に実行できますが、VB.Net で同等のものが必要です。VB.Net でさまざまな IAsyncResult プロパティを実装できる必要があります。

C#で

チャンピオンのように機能します...

public object AsyncState { get; set; }

VB.NET - これは失敗します

VB.Net でプロパティをオーバーロードできないため、これは失敗します。

Public ReadOnly Property AsyncState() As Object Implements IAsyncResult.AsyncState
    Get
        '... the GET's code goes here ...
    End Get
End Property
Public WriteOnly Property AsyncState() As Object
    Set(ByVal value As Object)
        '... the SET's code goes here ...
    End Set
End Property

VB.NET - これらは両方とも失敗します

これは、「IAsyncResult を実装する必要がある」という要件を満たしていません。

Public AsyncState As Object
Public AsyncState As Object Implements IAsyncResult.AsyncState
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1 に答える 1

0

これはトリックをしました...

    Public Class AsyncResult
        Implements IAsyncResult

#Region "CONSTRUCTORS"

        Public Sub New(ByVal callback As AsyncCallback, ByVal context As HttpContext)
            _asyncCallback = callback
            _httpContext = context
            _createdTime = DateTime.Now
        End Sub

#End Region

#Region "PROPERTIES"

        Public Const TimeoutSeconds As Integer = 3

        Private _asyncCallback As AsyncCallback
        Private _httpContext As HttpContext
        Private _createdTime As DateTime

        Public ReadOnly Property TimedOut() As Boolean
            Get
                Return ((DateTime.Now - _createdTime).TotalSeconds >= TimeoutSeconds)
            End Get
        End Property
        Public Property Response() As Response
            Get
                Return m_Response
            End Get
            Set(ByVal value As Response)
                m_Response = value
            End Set
        End Property
        Private m_Response As Response

#Region "IAsyncResult Members"

        Public ReadOnly Property HttpContext() As HttpContext
            Get
                Return _httpContext
            End Get
        End Property
        Public ReadOnly Property AsyncState() As Object Implements IAsyncResult.AsyncState
            Get
                Return m_AsyncState
            End Get
            'Set(ByVal value As Object)
            '    m_AsyncState = value
            'End Set
        End Property
        Private m_AsyncState As Object

        Private ReadOnly Property IAsyncResult_AsyncWaitHandle() As System.Threading.WaitHandle Implements IAsyncResult.AsyncWaitHandle
            Get
                Throw New NotImplementedException()
            End Get
        End Property

        Private ReadOnly Property IAsyncResult_CompletedSynchronously() As Boolean Implements IAsyncResult.CompletedSynchronously
            Get
                Return False
            End Get
        End Property

        Public ReadOnly Property IsCompleted() As Boolean Implements IAsyncResult.IsCompleted
            Get
                Return m_isCompleted
            End Get
            'Set(ByVal value As Boolean)
            '    If Not value Then
            '        Return
            '    End If

            '    Me.m_isCompleted = True
            '    _asyncCallback(Me)
            'End Set
        End Property
        Private m_isCompleted As Boolean = False

#End Region

#End Region

#Region "METHODS"

        Public Function ProcessRequest() As Boolean

            ' Any "Execution" code goes here...

            Return Me.IsCompleted
        End Function
#End Region

    End Class
于 2010-12-06T19:09:10.540 に答える