AWS SES C＃sendemailasync任务被取消

Question

我正在使用asp.net core 2.0，并尝试使用适用于.net的AWS开发工具包通过AWS SES发送电子邮件。

我使用了非常简单的代码来执行此操作，但是由于某些原因，当我尝试发送时，异步任务被取消了。 有什么明显的我想念的地方吗？ 我从此代码中获得的异常显示“操作已取消”。 如果我深入研究总体异常，它特别表示该任务已取消。

这是我的代码。

public async Task<transactionresponse> sendemail(string subject, string message, string sender, string replyto, List<string> receivers, string[] attachment = null)
    {
        transactionresponse tr = new transactionresponse();
        try
        {
            AmazonSimpleEmailServiceClient client = new AmazonSimpleEmailServiceClient(RegionEndpoint.USWest2);
            sender = (sender == "" ? config.GetSection("appsettings:appemail").Value : sender);
            var dest = new Destination
            {
                ToAddresses = receivers,
            };

            var from = sender;
            var messagesubject = new Content(subject);
            var body = new Body(new Content(message));
            var msg = new Message(messagesubject, body);

            var request = new SendEmailRequest
            {
                Destination = dest,
                Message = msg,
                Source = from
            };
            SendEmailResponse sendit = await client.SendEmailAsync(request);
        }
        catch (Exception ex)
        {
            tr.errors = new string[] { ex.ToString() };
            tr.message = ex.Message;
            tr.iserror = true;
        }
        return tr;
    }

这是例外：

“ System.OperationCanceledException：操作已取消。\\ r \\ n位于System.Net.Http.HttpClient.HandleFinishSendAsyncError（异常e，CancellationTokenSource cts）\\ r \\ n
在System.Net.Http.HttpClient.FinishSendAsyncUnbuffered（任务1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)\\r\\n
at System.Net.Http.HttpClient.GetStringAsyncCore(Task 1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)\\r\\n
at System.Net.Http.HttpClient.GetStringAsyncCore(Task 1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)\\r\\n
at System.Net.Http.HttpClient.GetStringAsyncCore(Task 1 getTask）\\ r \\ n在Amazon.Runtime.Internal.Util.AsyncHelpers。<> c__DisplayClass1_1 1.<<RunSync>b__0>d.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n
at Amazon.Runtime.Internal.Util.AsyncHelpers.ExclusiveSynchronizationContext.BeginMessageLoop() in E:\\\\JenkinsWorkspaces\\\\v3-trebuchet-release\\\\AWSDotNetPublic\\\\sdk\\\\src\\\\Core\\\\Amazon.Runtime\\\\Internal\\\\Util\\\\_mobile\\\\AsyncHelpers.cs:line 142\\r\\n
at Amazon.Runtime.Internal.Util.AsyncHelpers.RunSync[T](Func 1.<<RunSync>b__0>d.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n
at Amazon.Runtime.Internal.Util.AsyncHelpers.ExclusiveSynchronizationContext.BeginMessageLoop() in E:\\\\JenkinsWorkspaces\\\\v3-trebuchet-release\\\\AWSDotNetPublic\\\\sdk\\\\src\\\\Core\\\\Amazon.Runtime\\\\Internal\\\\Util\\\\_mobile\\\\AsyncHelpers.cs:line 142\\r\\n
at Amazon.Runtime.Internal.Util.AsyncHelpers.RunSync[T](Func 1.<<RunSync>b__0>d.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n
at Amazon.Runtime.Internal.Util.AsyncHelpers.ExclusiveSynchronizationContext.BeginMessageLoop() in E:\\\\JenkinsWorkspaces\\\\v3-trebuchet-release\\\\AWSDotNetPublic\\\\sdk\\\\src\\\\Core\\\\Amazon.Runtime\\\\Internal\\\\Util\\\\_mobile\\\\AsyncHelpers.cs:line 142\\r\\n
at Amazon.Runtime.Internal.Util.AsyncHelpers.RunSync[T](Func E：\\ JenkinsWorkspaces \\ v3-trebuchet-release \\ AWSDotNetPublic \\ sdk \\ src \\ Core \\ Amazon.Runtime \\ Internal \\ Util \\ _mobile \\ 1.<<RunSync>b__0>d.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n
at Amazon.Runtime.Internal.Util.AsyncHelpers.ExclusiveSynchronizationContext.BeginMessageLoop() in E:\\\\JenkinsWorkspaces\\\\v3-trebuchet-release\\\\AWSDotNetPublic\\\\sdk\\\\src\\\\Core\\\\Amazon.Runtime\\\\Internal\\\\Util\\\\_mobile\\\\AsyncHelpers.cs:line 142\\r\\n
at Amazon.Runtime.Internal.Util.AsyncHelpers.RunSync[T](Func 1任务）处AsyncHelpers.cs：第87行\\ r \\ n
在E：\\ JenkinsWorkspaces \\ v3-trebuchet-release \\ AWSDotNetPublic \\ sdk \\ src \\ Core \\ Amazon.Util \\ AWSSDKUtils.cs：line 1000 \\ r中的Amazon.Util.AWSSDKUtils.DownloadStringContent（Uri uri，TimeSpan timeout，IWebProxy代理）中\\ n
在E. \\ JenkinsWorkspaces \\ v3-trebuchet-release \\ AWSDotNetPublic \\ sdk \\ src \\ Core \\ Amazon.Util \\ _bcl + coreclr \\ EC2InstanceMetadata.cs中的Amazon.Util.EC2InstanceMetadata.GetItems（String relativeOrAbsolutePath，Int32 trys，Boolean slurp）中： 513行\\ r \\ n
在E：\\ JenkinsWorkspaces \\ v3-trebuchet-release \\ AWSDotNetPublic \\ sdk \\ src \\ Core \\ Amazon.Util \\ _bcl + coreclr \\ EC2InstanceMetadata.cs：line 311 \\ r \\ n中的Amazon.Util.EC2InstanceMetadata.get_IAMSecurityCredentials（）
在E：\\ JenkinsWorkspaces \\ v3-trebuchet-release \\ AWSDotNetPublic \\ sdk \\ src \\ Core \\ Amazon.Runtime \\ Credentials \\ _bcl + coreclr \\ DefaultInstance \\ AWSCredentials.cs：line 142 \\ r中的Amazon.Runtime.DefaultInstanceProfileAWSCredentials.FetchCredentials（）
在E：\\ JenkinsWorkspaces \\ v3-trebuchet-release \\ AWSDotNetPublic \\ sdk \\ src \\ Core \\ Amazon.Runtime \\ Credentials \\ _bcl + coreclr \\ DefaultInstanceProfileAWSCredentials.cs：line 88 \\ r \\ n中的Amazon.Runtime.DefaultInstanceProfileAWSCredentials.GetCredentials（）
在E：\\ JenkinsWorkspaces \\ v3-trebuchet-release \\ AWSDotNetPublic \\ sdk \\ src \\ Core \\ Amazon.Runtime \\ Credentials \\ _bcl + coreclr \\ DefaultInstance \\ AWSCredentials.cs：line 106 \\ r中的Amazon.Runtime.DefaultInstanceProfileAWSCredentials.GetCredentialsAsync（）
在E：\\ JenkinsWorkspaces \\ v3-trebuchet-release \\ AWSDotNetPublic \\ sdk \\ src \\ Core \\ Amazon.Runtime \\ Pipeline \\ Handlers \\ CredentialsRetriever.cs：line中的Amazon.Runtime.Internal.CredentialsRetriever.InvokeAsync [T]（IExecutionContext executeContext）中90 \\ r \\ n
E：\\ JenkinsWorkspaces \\ v3-trebuchet-release \\中的Amazon.Runtime.Internal.RetryHandler.InvokeAsync [T]（IExecutionContext executeContext）\\ r \\ n在Amazon.Runtime.Internal.RetryHandler.InvokeAsync [T]（IExecutionContext executeContext）中Amazon.Runtime.Internal.CallbackHandler.InvokeAsync的AWSDotNetPublic \\ sdk \\ src \\ Core \\ Amazon.Runtime \\ Pipeline \\ RetryHandler \\ RetryHandler.cs：line 137 \\ r \\ n [T]（IExecutionContext executeContext）\\ r \\ n
在Amazon.Runtime.Internal.CallbackHandler.InvokeAsync [T]（IExecutionContext executeContext）\\ r \\ n在Amazon.Runtime.Internal.ErrorCallbackHandler.InvokeAsync [T]（IExecutionContext executeContext）\\ r \\ n在Amazon.Runtime.Internal.MetricsHandler .InvokeAsync [T]（IExecutionContext executeContext）\\ r \\ n
在webworxfive.Helpers.messaging.sendemail（在messageting.cs：第48行中，为String（主题，String消息，String发送者，String Replyto，List`1接收者，String []附件））

Answer 1

好吧，我自己弄清楚了。 显然，我的应用程序没有从aws sdk配置文件设置中获取访问密钥和访问密码。 当我将其添加到我的appsettings中并将其调用到发送的代码中时。 我似乎记得当您安装Visual Studio插件时，它总是会抓住选定的配置文件密钥。 也许我记错了。

感谢那些发表评论的人。