在此相反，以所有的SO职位，谈论这个话题，我不感兴趣，在 [MessageContract] ，因为这是不允许的包装流对象当流模式（据我所知）。

In contrast to all the SO posts that talk about this topic, I'm not interested in wrapping a stream object in a [MessageContract], since that is not permitted when in streaming mode (afaik).

当我在流模式，我怎么返回给客户端的一些元数据，如长度和文件名？我可以添加一个WCF / SOAP头？我将如何做到这一点？

When I'm in streaming mode, how do I return to the client some metadata, such as length and filename? Can I add a WCF/SOAP header? How would I do this?

我期待到扩展文件流类，并添加 [的MessageHeader] 属性，但我无法得到这个工作。

I am looking into extending the filestream class and add a [MessageHeader] attribute, but I'm unable to get this to work.

推荐答案

下面是我们如何做到这一点

here is how we do it

     [MessageContract]
    public class StreamMessage
    {
        [MessageHeader(MustUnderstand = true)]
        public long Length { get; set; }
        [MessageHeader(MustUnderstand = true)]
        public int ServerVersion { get; set; }
        [MessageHeader(MustUnderstand = true)]
        public byte[] Cerificate { get; set; }
        [MessageBodyMember(Order = 1)]
        public Stream Stream;
    }