Question

我具有上传文件功能。我以块为单位上传文件，它尝试上传块，登录失败后尝试再次登录，然后重试上传。在某些文件上它可以正常工作，而在某些文件上则不能（关于哪些文件失败和哪些文件上载没有一致性-同一文件一次可以工作而另一种则不能）。

我在上传文件功能时遇到的错误：

System.ObjectDisposedException：无法访问已处置的对象。对象名称：“ System.Net.Http.MultipartFormDataContent”。在 System.Net.Http.HttpContent.CheckDisposed（）在 System.Net.Http.HttpContent.CopyToAsync（Stream stream， TransportContext上下文）位于 System.Net.Http.HttpClientHandler.GetRequestStreamCallback（IAsyncResult ar） ---从之前引发异常的位置开始的堆栈跟踪- System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务） System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务），位于System.Runtime.CompilerServices.TaskAwaiter`1.GetResult（）在

功能：

private bool uploadFile(string path, ref string fileName)
        {

            var chunkSize = 1024 * 1024;
            var identifier = Guid.NewGuid();
            using (var fileStream = File.OpenRead(path))
            using (var client = new HttpClient())
            {
                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
                var count = 1;
                var totalChunkCount = Math.Ceiling((double)fileStream.Length / chunkSize);
                HttpResponseMessage response = null;
                while (fileStream.Position < fileStream.Length)
                {
                    var readCount = fileStream.Length - fileStream.Position > chunkSize
                        ? chunkSize
                        : (int)(fileStream.Length - fileStream.Position);
                    var buffer = new byte[readCount];
                    fileStream.Read(buffer, 0, readCount);
                    using (var chunkedStream = new MemoryStream(buffer))
                    {
                        using (var content = new MultipartFormDataContent())
                        {
                            content.Add(new StreamContent(chunkedStream),
                                Path.GetFileNameWithoutExtension(path), Path.GetFileName(path));
                            content.Add(new StringContent(count.ToString()), "ChunkNumber");
                            content.Add(new StringContent(totalChunkCount.ToString()), "TotalChunks");
                            content.Add(new StringContent(identifier), "Identifier");
                            content.Add(new StringContent(Path.GetFileName(path)), "Filename");

                            response = client.PostAsync(m_uploadURL, content).GetAwaiter().GetResult();
                            if (!response.IsSuccessStatusCode && response.StatusCode == HttpStatusCode.Unauthorized)
                            {
                                login();
                                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
                                response = client.PostAsync(m_uploadURL, content).GetAwaiter().GetResult();
                            }
                        }
                    }
                    ShowPercentProgress("Upload of  " + path, count, Convert.ToInt32(totalChunkCount));
                    count++;
                }

                if (response != null)
                {
                    var contents = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
                    var json = JObject.Parse(contents);
                    var uploadResponse = json.ToObject<UploadResponse>();
                    if (!uploadResponse.status.isSuccess)
                    {
                        Logger.Log("Error: " + uploadResponse.status.statusDescription);
                        return false;
                    }
                    if (uploadResponse.data.allChunksUploaded)
                    {
                        serverFileName = uploadResponse.data.fileName;
                        return true;
                    }
                }
            }

            return false;
        }

在网上找不到答案

Answer 1

各种内容都用大括号括起来。而且您正在使用postbasync。因此，它异步调用，当它从var scope移出时，内容对象会自动处置。尝试

                   var content = new MultipartFormDataContent():

                        content.Add(new StreamContent(chunkedStream),
                            Path.GetFileNameWithoutExtension(path), Path.GetFileName(path));
                        content.Add(new StringContent(count.ToString()), "ChunkNumber");
                        content.Add(new StringContent(totalChunkCount.ToString()), "TotalChunks");
                        content.Add(new StringContent(identifier), "Identifier");
                        content.Add(new StringContent(Path.GetFileName(path)), "Filename");

使用删除。

httpclient.postasync-System.ObjectDisposedException：无法访问已处置的对象

1 个答案: