Question

我正在用.NET编写高性能套接字应用程序。我有以下代码异步读取套接字。

Private Sub Read(ByVal ar As IAsyncResult)
    Dim asyncState = DirectCast(ar.AsyncState, ReadAsyncState)
    Dim buffer = asyncState.Buffer
    Dim client = asyncState.client

    Try
        Dim stream = client.GetStream()

        'Complete the asynchronous read and get the first block of data.
        If stream IsNot Nothing AndAlso stream.CanRead Then
            Dim byteCount = stream.EndRead(ar)

            If byteCount = 0 Then
                'If there is no data when an asynchronous read completes it is because the client closed the connection.
                Me.RemoveClient(client)
            Else
                'Notify any listeners that a message was received.
                RaiseEvent MessageReceived(client, buffer.Take(byteCount).ToArray)

                'Listen asynchronously for another incoming message.
                stream.BeginRead(buffer, 0, Me.BufferSize, AddressOf Read, New ReadAsyncState With {.client = client, .Buffer = buffer})
            End If
        Else
            Me.RemoveClient(client)
        End If
    Catch ex As Exception
        Me.RemoveClient(client)
        Return
    End Try
End Sub

以下代码的性能如何？

RaiseEvent MessageReceived(client, buffer.Take(byteCount).ToArray)

我使用1024作为缓冲区大小。所以变量 buffer 是一个大小为1024的字节数组。但是我只需要返回一个大小为 byteCount 的缓冲区。为此，我使用Array.Take（）。ToArray（）。有没有更好的方法来实现这一点来提高性能？使用Array.Copy或Buffer.BlockCopy是否更好？

Answer 1

我认为这是你遇到的问题。如果你需要高性能，我会看SocketAsyncEventArgs。此外，提升事件将阻止您的线程，直到事件完成。我会有两个线程，一个从套接字读取并将数据放入队列。另一个从队列中读取数据并对其进行处理。

Array.Take（）的性能.ToArray（）

1 个答案: