从 System.ServiceModel.Channels 消息中获取 ArraySegment<byte>

Question

我不得不修改 SOAP headers 所以我重写了

public override ArraySegment<byte> WriteMessage(Message message, int maxMessageSize, BufferManager bufferManager, int messageOffset)

但是我必须 return ArraySegment，所以我怎样才能从 System.ServiceModel.Channels.Message

得到 ArraySegment

Answer 1

public override ArraySegment<byte> WriteMessage(Message message, int maxMessageSize, BufferManager bufferManager, int messageOffset)
{
    MemoryStream stream = new MemoryStream();
    XmlWriter writer = XmlWriter.Create(stream, this.writerSettings);
    message.WriteMessage(writer);
    writer.Close();

    byte[] messageBytes = stream.GetBuffer();
    int messageLength = (int)stream.Position;
    stream.Close();

    int totalLength = messageLength + messageOffset;
    byte[] totalBytes = bufferManager.TakeBuffer(totalLength);
    Array.Copy(messageBytes, 0, totalBytes, messageOffset, messageLength);

    ArraySegment<byte> byteArray = new ArraySegment<byte>(totalBytes, messageOffset, messageLength);
    return byteArray;
}

复制自 official documentation。