C＃HttpClient PUT

Question

出于某种原因，我现在使用的下面的代码因此引发了异常：

public static async Task<string> HttpPut(string inUrl, string inFilePath)
    {
        using (var handler = new HttpClientHandler
        {
            AllowAutoRedirect = false
        })
        {
            using (var client = new HttpClient(handler))
            {
                //var content = new StreamContent(new FileStream(inFilePath, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 4096, useAsync: true));
                using (var content = new StreamContent(new FileStream(inFilePath, FileMode.Open)))
                {
                    content.Headers.Remove("Content-Type");
                    content.Headers.Add("Content-Type", "application/octet-stream");

                    using (var req = new HttpRequestMessage(HttpMethod.Put, inUrl))
                    {
                        string authInfo = String.Format("{0}:{1}", Program.Config.MediaStorageList.Find(o => o.Name == "Viz Media Engine Test").UserName, Program.Config.MediaStorageList.Find(o => o.Name == "Viz Media Engine Test").Password);
                        authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
                        req.Headers.Add("Authorization", "Basic " + authInfo);
                        req.Headers.Remove("Expect");
                        req.Headers.Add("Expect", "");
                        //req.Headers.TransferEncodingChunked = true;

                        req.Content = content;

                        // Ignore Certificate validation failures (aka untrusted certificate + certificate chains)
                        ServicePointManager.ServerCertificateValidationCallback = ((sender, certificate, chain, sslPolicyErrors) => true);

                        using (HttpResponseMessage resp = await client.SendAsync(req))
                        {
                            //This part is specific to the setup on an Expo we're at...
                            if (resp.StatusCode == HttpStatusCode.Redirect || resp.StatusCode == HttpStatusCode.TemporaryRedirect)
                            {
                                string redirectUrl = resp.Headers.Location.ToString();

                                if (redirectUrl.Contains("vme-store"))
                                {
                                    redirectUrl = redirectUrl.Replace("vme-store", "10.230.0.11");
                                }
                                return await HttpPut(redirectUrl, inFilePath);
                            }

                            resp.EnsureSuccessStatusCode();

                            return await resp.Content.ReadAsStringAsync();
                        }
                    }
                }
            }
        }
    }

我得到的例外是：

System.NotSupportedException was unhandled
HResult=-2146233067
Message=The stream does not support concurrent IO read or write operations.
Source=System
StackTrace:
     at System.Net.ConnectStream.InternalWrite(Boolean async, Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
   at System.Net.ConnectStream.BeginWrite(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
   at System.Net.Http.StreamToStreamCopy.BufferReadCallback(IAsyncResult ar)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at VizWolfInnerServer.Tools.HttpConnector.<HttpPut>d__39.MoveNext() in c:\Users\christer\Documents\Visual Studio 2012\Projects\VizWolfNew\VizWolfInnerServer\Tools\HttpConnector.cs:line 202
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at VizWolfInnerServer.Tools.VizAPIConnector.<VmeUploadMedia>d__0.MoveNext() in c:\Users\christer\Documents\Visual Studio 2012\Projects\VizWolfNew\VizWolfInnerServer\Tools\VizAPIConnector.cs:line 187
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__1(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
InnerException: 

我很难找到HttpClient的正确文档和示例，我正在努力弄清楚为什么这突然不起作用（与StringContent完全相似的方法而不是StreamContent完美地工作）...

它最初是从它自己的线程中调用的，然后像这样：

public static async void VmeUploadMedia(string inUploadLink, string inFilePath)
{
    string result = await HttpConnector.HttpPut(inUploadLink, inFilePath);
}

有人发现任何明显的事情吗？

由于

更新

结果让那些世界各地的人用它的IP映射他们的存储名称，所以我可以回到原来的代码是最好的解决方案。我遇到的问题与AllowAutoRedirect = false有关。在HttpResponseMessage resp = await client.SendAsync（req）上发生异常，即使实际上没有重定向。我有点迷失为什么它甚至发生了，但使用这个代码现在一切正常：

public static async Task<string> HttpPut(string inUrl, string inFilePath)
    {
        using (var client = new HttpClient())
        {
            using (var content = new StreamContent(File.OpenRead(inFilePath)))
            {
                content.Headers.Remove("Content-Type");
                content.Headers.Add("Content-Type", "application/octet-stream");

                using (var req = new HttpRequestMessage(HttpMethod.Put, inUrl))
                {
                    string authInfo = String.Format("{0}:{1}", Program.Config.MediaStorageList.Find(o => o.Name == "Viz Media Engine Test").UserName, Program.Config.MediaStorageList.Find(o => o.Name == "Viz Media Engine Test").Password);
                    authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
                    req.Headers.Add("Authorization", "Basic " + authInfo);
                    req.Headers.Remove("Expect");
                    req.Headers.Add("Expect", "");

                    req.Content = content;

                    // Ignore Certificate validation failures (aka untrusted certificate + certificate chains)
                    ServicePointManager.ServerCertificateValidationCallback = ((sender, certificate, chain, sslPolicyErrors) => true);

                    using (HttpResponseMessage resp = await client.SendAsync(req))
                    {
                        resp.EnsureSuccessStatusCode();

                        return await resp.Content.ReadAsStringAsync();
                    }
                }
            }
        }
    }

感谢那些试图帮助的人

Answer 1

结果让那些世界各地的人用它的IP映射他们的存储名称，所以我可以回到原来的代码是最好的解决方案。我遇到的问题与AllowAutoRedirect = false有关。在HttpResponseMessage resp = await client.SendAsync（req）上发生异常，即使实际上没有重定向。我有点迷失为什么它甚至发生了，但使用这个代码现在一切正常：

public static async Task<string> HttpPut(string inUrl, string inFilePath)
    {
        using (var client = new HttpClient())
        {
            using (var content = new StreamContent(File.OpenRead(inFilePath)))
            {
                content.Headers.Remove("Content-Type");
                content.Headers.Add("Content-Type", "application/octet-stream");

                using (var req = new HttpRequestMessage(HttpMethod.Put, inUrl))
                {
                    string authInfo = String.Format("{0}:{1}", Program.Config.MediaStorageList.Find(o => o.Name == "Viz Media Engine Test").UserName, Program.Config.MediaStorageList.Find(o => o.Name == "Viz Media Engine Test").Password);
                    authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
                    req.Headers.Add("Authorization", "Basic " + authInfo);
                    req.Headers.Remove("Expect");
                    req.Headers.Add("Expect", "");

                    req.Content = content;

                    // Ignore Certificate validation failures (aka untrusted certificate + certificate chains)
                    ServicePointManager.ServerCertificateValidationCallback = ((sender, certificate, chain, sslPolicyErrors) => true);

                    using (HttpResponseMessage resp = await client.SendAsync(req))
                    {
                        resp.EnsureSuccessStatusCode();

                        return await resp.Content.ReadAsStringAsync();
                    }
                }
            }
        }
    }

感谢那些试图帮助的人

Answer 2

using (HttpResponseMessage resp = await client.SendAsync(req))

似乎这一行会为该执行创建一个新的上下文，因此一个新的线程上下文，也许你不能这样做，因为你将共享FileStream的锁。

Answer 3

您似乎再次致电HttpPut()，但仍然打开了FileStream。在从内部递归调用HttpPut()之前尝试处理FileStream。

//This part is specific to the setup on an Expo we're at...
                            if (resp.StatusCode == HttpStatusCode.Redirect || resp.StatusCode == HttpStatusCode.TemporaryRedirect)
                            {
                                string redirectUrl = resp.Headers.Location.ToString();

                                if (redirectUrl.Contains("vme-store"))
                                {

                                    redirectUrl = redirectUrl.Replace("vme-store", "10.230.0.11");
                                }
                                content.Dispose();
                                return await HttpPut(redirectUrl, inFilePath);
                        }

此外，您可能希望处理任何其他IDisposable对象（如http响应），以确保在深入到堆栈跟踪之前释放所有资源。这是递归的一个问题，当你使用Using语句时，你不会离开他们的范围，所以他们没有做好自己的工作。