owin，webapi中将文件写入到response stream中

首先在controller项目中添加一个类：

 using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Net;
 using System.Net.Http;
 using System.Text;
 using System.Threading.Tasks;

 namespace Test
 {
     public interface IWriteStreamToResponse<T>
     {
         T Suorce { get; set; }
         void WriteToStream(Stream outputStream, HttpContent content, TransportContext context);
     }

     public class StreamFromFileName : IWriteStreamToResponse<string>
     {
         private string _suorce;

         public string Suorce
         {
             get
             {
                 return _suorce;
             }
             set
             {
                 _suorce = value;
             }
         }
         public async void WriteToStream(Stream outputStream, HttpContent content, TransportContext context)
         {
             try
             {
                 ];
                 using (var video = File.Open(_suorce, FileMode.Open, FileAccess.Read))
                 {
                     var length = (int)video.Length;
                     ;

                      && bytesRead > )
                     {
                         bytesRead = video.Read(buffer, , Math.Min(length, buffer.Length));
                         , bytesRead);
                         length -= bytesRead;
                     }
                 }
             }
             catch (Exception ex)
             {
                 return;
             }
             finally
             {
                 outputStream.Close();
             }
         }
     }

     public class StreamFromBytes : IWriteStreamToResponse<byte[]>
     {
         private byte[] _source;

         public byte[] Suorce
         {
             get
             {
                 return _source;
             }
             set
             {
                 _source = value;
             }
         }

         public async void WriteToStream(Stream outputStream, HttpContent content, TransportContext context)
         {
             try
             {
                 , _source.Length);
             }
             catch (Exception ex)
             {
                 return;
             }
             finally
             {
                 outputStream.Close();
             }
         }
     }
 }

controller中的action调用

  public HttpResponseMessage GetVideo(string file)
         {
             try
             {
                 var bytes = IC.GetClipFileBytes(file.Replace(".mp4", ""));
                 if (bytes == Encoding.UTF8.GetBytes(EntityEnums.StatusCode.NoFound.ToString()))
                     throw new HttpResponseException(HttpStatusCode.NotFound);
                 IWriteStreamToResponse<byte[]> video = new StreamFromBytes() { Suorce = bytes };
                 Action<Stream, HttpContent, TransportContext> send = video.WriteToStream;
                 var response = Request.CreateResponse();
                 response.Content = new System.Net.Http.PushStreamContent(send, new MediaTypeHeaderValue("video/mp4"));
                 //调用异步数据推送接口
                 return response;

             }
             catch (Exception)
             {
                 throw;
             }
         }

action中接收客户端upload的文件

  string tempFile = Environment.GetEnvironmentVariable("TEMP");
                MultipartFormDataStreamProvider provider = new MultipartFormDataStreamProvider(tempFile);
                var result = Request.Content.ReadAsMultipartAsync(provider).Result;
                string[] arrFiles = new string[provider.FileData.Count];
                ;
                //Request.Content.ReadAsMultipartAsync().Wait();
                // 获取文件名称
                foreach (MultipartFileData fileData in provider.FileData)
                {
                }