vb.net - npgsql 连接等待 ssl

Question

我在 vb.net 中通过 npgsql 设置了一个监听器以接收来自 postresql 的通知。 sub 只是打开一个新的 ssl 连接并启动一个带有循环等待通知的新线程。下面是代码

Public Sub StartListening()
    If mConnString Is Nothing Then
        Main_Form.WriteMessage("Not connected")
    End If
    Try
        connection = New NpgsqlConnection(mConnString) With {
            .ProvideClientCertificatesCallback = New ProvideClientCertificatesCallback(AddressOf MyProvideClientCertificates)
        }
        connection.Open()
        If connection.State = ConnectionState.Open Then
            Using command = New NpgsqlCommand("listen my_notification", connection)
                command.ExecuteNonQuery()
            End Using
        End If

        AddHandler connection.Notification, New NotificationEventHandler(AddressOf OnNotification)
        Dim thread As New Thread(
            Sub()
                While True
                    connection.Wait()
                End While
            End Sub
        )
        thread.Start()

    Catch ex As Exception
        Main_Form.WriteMessage("Error:" +  ex.Message)
    End Try
End Sub


Private Sub MyProvideClientCertificates(ByVal clienteCertis As X509CertificateCollection)
    Dim cert As X509Certificate2 = New X509Certificate2("mycertificate.pfx")
    clienteCertis.Add(cert)
End Sub

在我引入 SSL 连接之前一切正常:它在 connection.Wait() 说

时失败

Wait() with timeout isn't supported when SSL is used, see https://github.com/npgsql/npgsql/issues/1501

因为实际上我不需要超时，所以我尝试在连接字符串中设置 timeout=0 和 commandtimeout=0 但错误仍然存​​在，这就是我在错误堆栈跟踪

in Npgsql.NpgsqlConnector.Wait(Int32 timeout)

in Npgsql.NpgsqlConnection.Wait(Int32 timeout)

in Npgsql.NpgsqlConnection.Wait()

有人能帮忙吗？

Answer 1

我找到了解决方案。我写在这里以防万一其他人有同样的问题。

我将 Wait() 更改为 WaitAsync()。

为了避免连续循环，还添加了Await并将子声明为Async。

下面是代码

        ....
        Dim thread As New Thread(
            Async Sub()
                While True
                    Await connection.WaitAsync()
                End While
            End Sub
        )
        thread.Start()
        ....