c# - 如何在没有多部分 MIME 类型的 ASP .Net WebAPI 中接收大文件（> 2GB）？

Question

有没有办法实现一个.net Web api来接收一个使用没有多部分/表单数据mime类型的无缓冲输入流的lrage文件（> 2gb）？

我试图用下面的代码来做，但它没有完全读取流。我正在尝试上传 100 MB 的文件，但它只将 10MB 写入“c:\sampl.zip”并出来。下面的代码出了什么问题？

        public async Task<HttpResponseMessage> FileReceive1r(string id)
        {
            var content = new StreamContent(HttpContext.Current.Request.GetBufferlessInputStream(true));
            Stream stream = HttpContext.Current.Request.GetBufferlessInputStream(true);

            StreamReader rdr = new StreamReader(stream);
            while(!rdr.EndOfStream)
            {
                //FileStream fs = new FileStream(@"c:\sampl.zip", FileMode.OpenOrCreate);
                StreamWriter wrtr = new StreamWriter(new FileStream(@"c:\sampl.zip", FileMode.OpenOrCreate));
                wrtr.Write(rdr.ReadToEnd());
                wrtr.Close();
            }
            rdr.Close();
            return await Task.FromResult(new HttpResponseMessage(HttpStatusCode.Created));
        }

Answer 1

您可以使用以下代码以块的形式下载文件

public HttpResponseMessage Get()
        {
            string filename = @"c:\sampl.zip";

            var response = this.Request.CreateResponse();

            response.Content = new PushStreamContent(async (Stream outputStream, HttpContent content, TransportContext context) =>
            {
                try
                {
                    var buffer = new byte[65536];

                    using (var video = File.Open(filename, FileMode.Open, FileAccess.Read))
                    {
                        var length = (int)video.Length;
                        var bytesRead = 1;

                        while (length > 0 && bytesRead > 0)
                        {
                            bytesRead = video.Read(buffer, 0, Math.Min(length, buffer.Length));
                            await outputStream.WriteAsync(buffer, 0, bytesRead);
                            length -= bytesRead;

                        }
                    }
                }
                finally
                {
                    outputStream.Close();
                }
            });

            return response;
        }