从WCT Restful服务中消费FileStream

本文关键字：FileStream 服务 WCT Restful | 更新日期: 2023-09-27 18:10:25

我已经创建了一个WCF Restful服务，代码如下:

接口: 

[ServiceContract]
public interface ISIGService
{
    [OperationContract]
    [WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Xml,
        BodyStyle = WebMessageBodyStyle.Bare,
        UriTemplate = "GetMultimedia/{id}")]
    Stream GetMultimedia(string id);
}

实现服务的代码:

public Stream GetMultimedia(string id)
{
    string filePath = MultimediaBLL.GetFilePath(int.Parse(id));
    if (string.IsNullOrEmpty(filePath))
        return null;
    try
    {
        FileStream multimediaFileStream = File.OpenRead(filePath);
        return multimediaFileStream;
    }
    catch (Exception ex)
    {
        Console.WriteLine("Not able to get multimedia stream:{0}", ex.Message);
        throw ex;
    }
}

我需要使用这个获取多媒体文件(图像，音频或视频)的文件流的服务，到目前为止，我有这个:

RestClient client = new RestClient(urlService);
RestRequest request = new RestRequest
{
    Method = Method.GET,
    RequestFormat = DataFormat.Xml,
    Resource = "GetMultimedia/{id}"
};
request.AddParameter("id", idMultimedia, ParameterType.UrlSegment);
var response = client.Execute(request);
if (!response.StatusCode != HttpStatusCode.OK)
   return;
???

我不知道如何获取流并处理它以在处理程序中显示它，像这样:

context.Response.ClearContent();
context.Response.ClearHeaders();
context.Response.AddHeader("Content-Length", bytes.Length.ToString());
context.Response.BinaryWrite(bytes);
context.Response.End();

我想我必须得到文件字节发送给处理程序。

从WCT Restful服务中消费FileStream

我不知道这是不是你想做的事情。

public Stream GetMultimedia(string id)
{ 
    string filePath = MultimediaBLL.GetFilePath(int.Parse(id));
    if (string.IsNullOrEmpty(filePath))
        return null;
    try
    {
        FileStream multimediaFileStream = File.OpenRead(filePath);
        WebOperationContext.Current.OutgoingResponse.ContentType = "Your/contentType";
        WebOperationContext.Current.OutgoingResponse.Headers["Content-Disposition"] = "attachment; filename=Your_file_name.png";
        return multimediaFileStream;
    }
    catch (Exception ex)
    {
        Console.WriteLine("Not able to get multimedia stream:{0}", ex.Message);
        throw ex;
    }
}


RestClient client = new RestClient(urlService);
RestRequest request = new RestRequest
{
    Method = Method.GET,
    RequestFormat = DataFormat.Xml,
    Resource = "GetMultimedia/{id}"
};
request.AddParameter("id", idMultimedia, ParameterType.UrlSegment);
context.Response.Clear();
content.Response.ClearHeaders();
# write original responseStream to the context.Response.OutputStream
request.ResponseWriter = (responseStream) => responseStream.WriteTo(context.Response.OutputStream);
var response = client.DownloadData(request);
# maybe you need to add content type and file name as well
context.Response.AddHeader("Content-Type", "fetch from response");
context.Response.AddHeader("Content-Disposition", "fetch from response");
context.Response.Flush();
context.Response.Close();
context.Response.End();
if (!response.StatusCode != HttpStatusCode.OK)
    # do something
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