ServiceStack是否支持二进制响应？

ServiceStack服务中是否有任何机制返回流/大二进制数据？ WCF的MTOM支持在返回大量数据而无需文本转换开销的情况下很难但很有效。

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从鸟瞰视图中，ServiceStack可以返回以下任何一项：

任何DTO对象 - >序列化为Response ContentType

HttpResult，HttpError，CompressedResult（IHttpResult）用于定制HTTP响应

以下类型不会被转换并直接写入响应流：

串

流

IStreamWriter

字节[] - 与application/octet-stream内容类型。

细节

除了返回纯C＃对象之外，ServiceStack还允许您返回任何Stream或IStreamWriter（对于如何写入响应流，这会更灵活一些）：

public interface IStreamWriter
{
    void WriteTo(Stream stream);
}

两者都允许您直接写入Response OutputStream，而不会产生额外的转换开销。

如果你想在同一时间自定义HTTP标头，你只需要实现IHasOptions，任何字典条目被写入Response HttpHeaders。

public interface IHasOptions
{
    IDictionary<string, string> Options { get; }
}

除此之外，IHttpResult还允许您可以提供自定义HTTP响应状态代码的HTTP输出的更细粒度控制。 您可以参考HttpResult对象的实现，以实现上述接口的实际实现。

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我喜欢服务堆栈，这个litle代码足以从内存流中返回Excel报告

public class ExcelFileResult : IHasOptions, IStreamWriter
{
    private readonly Stream _responseStream;
    public IDictionary<string, string> Options { get; private set; }

    public ExcelFileResult(Stream responseStream)
    {
        _responseStream = responseStream;

        Options = new Dictionary<string, string> {
             {"Content-Type", "application/octet-stream"},
             {"Content-Disposition", "attachment; filename="report.xls";"}
         };
    }

    public void WriteTo(Stream responseStream)
    {
        if (_responseStream == null) 
            return;

        _responseStream.WriteTo(responseStream);
        responseStream.Flush();
    }
}

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我也有类似的要求，这也要求我跟踪流式文件下载的进度。 我大致是这样做的：

服务器端：

服务：

public object Get(FooRequest request)
{
    var stream = ...//some Stream
    return new StreamedResult(stream);
}

StreamedResult类：

public class StreamedResult : IHasOptions, IStreamWriter
{
    public IDictionary<string, string> Options { get; private set; }
    Stream _responseStream;

    public StreamedResult(Stream responseStream)
    {
        _responseStream = responseStream;

        long length = -1;
        try { length = _responseStream.Length; }
        catch (NotSupportedException) { }

        Options = new Dictionary<string, string>
        {
            {"Content-Type", "application/octet-stream"},
            { "X-Api-Length", length.ToString() }
        };
    }

    public void WriteTo(Stream responseStream)
    {
        if (_responseStream == null)
            return;

        using (_responseStream)
        {
            _responseStream.WriteTo(responseStream);
            responseStream.Flush();
        }
    }
}

客户端：

string path = Path.GetTempFileName();//in reality, wrap this in try... so as not to leave hanging tmp files
var response = client.Get<HttpWebResponse>("/foo/bar");

long length;
if (!long.TryParse(response.GetResponseHeader("X-Api-Length"), out length))
    length = -1;

using (var fs = System.IO.File.OpenWrite(path))
    fs.CopyFrom(response.GetResponseStream(), new CopyFromArguments(new ProgressChange((x, y) => { Console.WriteLine(">> {0} {1}".Fmt(x, y)); }), TimeSpan.FromMilliseconds(100), length));

“CopyFrom”扩展方法直接从此项目的源代码文件“StreamHelper.cs”中借用：复制具有进度报告的流（赞美Henning Dieterichs）

并赞扬神话和任何对ServiceStack的贡献者。 伟大的项目！

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