C# .NET中的AWS Lambda函数在为s3 bucket创建新文件时抛出错误（无法确定内容长度）

我正在使用GN.NETCore2开发AWS lambda函数。这是我第一次使用.NET开发AWS lambda函数。我现在尝试做的很简单，读取现有文件并用新名称（新名称）保存文件。读取文件工作正常。但是当我使用PutObjectRequest保存文件时，它给了我一个错误

这是我的处理函数代码

public async Task<string> FunctionHandler(S3Event evnt, ILambdaContext context)
      {
         var s3Event = evnt.Records?[0].S3;
         if(s3Event == null)
         {
            return null;
         }

         try
         {
            if(s3Event.Object.Key.ToLower().Contains("thumb"))
            {
               //Console.WriteLine("The image is already a thumb file");
               return "The file is aready a thumb image file";
            }

            string[] pathSegments = s3Event.Object.Key.Split('/');
            string eventCode = pathSegments[0];
            string userEmail = pathSegments[1];
            string filename = pathSegments[2];
            string extension = Path.GetExtension(filename); //.jpeg with "dot"
            string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(filename);

            using(var objectResponse = await this.S3Client.GetObjectAsync(s3Event.Bucket.Name, s3Event.Object.Key))
            {
               using(Stream responseStream = objectResponse.ResponseStream)
               {
                  //This code is throwing error
                  await this.S3Client.PutObjectAsync(new Amazon.S3.Model.PutObjectRequest
                  {
                     BucketName = s3Event.Bucket.Name,
                     Key = fileNameWithoutExtension + ".thumb" + extension,
                     InputStream = responseStream
                  });
               }
            }

            return "Thumbnail version of the image has been created";

         }
         catch(Exception e)
         {
            context.Logger.LogLine($"Error getting object {s3Event.Object.Key} from bucket {s3Event.Bucket.Name}. Make sure they exist and your bucket is in the same region as this function.");
            context.Logger.LogLine(e.Message);
            context.Logger.LogLine(e.StackTrace);
            throw;
         }
      }

公共异步任务FunctionHandler（S3Event evnt，ILambdaContext上下文）
{
var s3Event=evnt.Records？[0].S3；
if（s3Event==null）
{
返回null；
}
尝试
{
if（s3Event.Object.Key.ToLower（）包含（“thumb”））
{
//WriteLine（“图像已经是一个拇指文件”）；
返回“该文件是一个拇指图像文件”；
}
string[]pathSegments=s3Event.Object.Key.Split（'/'）；
字符串eventCode=pathSegments[0]；
字符串userEmail=pathSegments[1]；
字符串文件名=路径段[2]；
字符串扩展名=Path.GetExtension（文件名）；//.jpeg，带“点”
字符串fileNameWithoutExtension=Path.GetFileNameWithoutExtension（文件名）；
使用（var objectResponse=wait this.S3Client.GetObjectAsync（s3Event.Bucket.Name，s3Event.Object.Key））
{
使用（Stream responseStream=objectResponse.responseStream）
{
//此代码正在抛出错误
等待这个.S3Client.PutObjectAsync（新的Amazon.S3.Model.PutObjectRequest
{
BucketName=s3Event.Bucket.Name，
Key=filename不带outextension+“.thumb”+扩展名，
InputStream=responseStream
});
}
}
返回“已创建图像的缩略图版本”；
}
捕获（例外e）
{
context.Logger.LogLine（$“从bucket{s3Event.bucket.Name}获取对象{s3Event.object.Key}时出错。请确保它们存在并且您的bucket与此函数位于同一区域。”）；
context.Logger.LogLine（e.Message）；
context.Logger.LogLine（如StackTrace）；
投掷；
}
}

当我运行测试函数时，它给了我这个错误

{
  "errorType": "AggregateException",
  "errorMessage": "One or more errors occurred. (Could not determine content length)",
  "stackTrace": [
    "at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)",
    "at lambda_method(Closure , Stream , Stream , LambdaContextInternal )"
  ],
  "cause": {
    "errorType": "AmazonS3Exception",
    "errorMessage": "Could not determine content length",
    "stackTrace": [
      "at Amazon.S3.Model.Internal.MarshallTransformations.PutObjectRequestMarshaller.GetStreamWithLength(Stream baseStream, Int64 hintLength)",
      "at Amazon.S3.Model.Internal.MarshallTransformations.PutObjectRequestMarshaller.Marshall(PutObjectRequest putObjectRequest)",
      "at Amazon.Runtime.Internal.Marshaller.PreInvoke(IExecutionContext executionContext)",
      "at Amazon.Runtime.Internal.Marshaller.InvokeAsync[T](IExecutionContext executionContext)",
      "at Amazon.Runtime.Internal.CallbackHandler.<InvokeAsync>d__9`1.MoveNext()",
      "--- End of stack trace from previous location where exception was thrown ---",
      "at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()",
      "at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)",
      "at Amazon.S3.Internal.AmazonS3ExceptionHandler.<InvokeAsync>d__1`1.MoveNext()",
      "--- End of stack trace from previous location where exception was thrown ---",
      "at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()",
      "at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)",
      "at Amazon.Runtime.Internal.ErrorCallbackHandler.<InvokeAsync>d__5`1.MoveNext()",
      "--- End of stack trace from previous location where exception was thrown ---",
      "at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()",
      "at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)",
      "at Amazon.Runtime.Internal.MetricsHandler.<InvokeAsync>d__1`1.MoveNext()",
      "--- End of stack trace from previous location where exception was thrown ---",
      "at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()",
      "at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)",
      "at AwsS3Lambda.Function.<FunctionHandler>d__10.MoveNext() in C:\\Users\\Acer\\Desktop\\MementoCSharp\\memento-dotnet\\AwsS3Lambda\\Function.cs:line 99"
    ]
  },
  "causes": [
    {
      "errorType": "AmazonS3Exception",
      "errorMessage": "Could not determine content length",
      "stackTrace": [
        "at Amazon.S3.Model.Internal.MarshallTransformations.PutObjectRequestMarshaller.GetStreamWithLength(Stream baseStream, Int64 hintLength)",
        "at Amazon.S3.Model.Internal.MarshallTransformations.PutObjectRequestMarshaller.Marshall(PutObjectRequest putObjectRequest)",
        "at Amazon.Runtime.Internal.Marshaller.PreInvoke(IExecutionContext executionContext)",
        "at Amazon.Runtime.Internal.Marshaller.InvokeAsync[T](IExecutionContext executionContext)",
        "at Amazon.Runtime.Internal.CallbackHandler.<InvokeAsync>d__9`1.MoveNext()",
        "--- End of stack trace from previous location where exception was thrown ---",
        "at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()",
        "at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)",
        "at Amazon.S3.Internal.AmazonS3ExceptionHandler.<InvokeAsync>d__1`1.MoveNext()",
        "--- End of stack trace from previous location where exception was thrown ---",
        "at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()",
        "at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)",
        "at Amazon.Runtime.Internal.ErrorCallbackHandler.<InvokeAsync>d__5`1.MoveNext()",
        "--- End of stack trace from previous location where exception was thrown ---",
        "at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()",
        "at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)",
        "at Amazon.Runtime.Internal.MetricsHandler.<InvokeAsync>d__1`1.MoveNext()",
        "--- End of stack trace from previous location where exception was thrown ---",
        "at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()",
        "at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)",
        "at AwsS3Lambda.Function.<FunctionHandler>d__10.MoveNext() in C:\\Users\\Acer\\Desktop\\MementoCSharp\\memento-dotnet\\AwsS3Lambda\\Function.cs:line 99"
      ]
    }
  ]
}

{
“errorType”：“AggregateException”，
“errorMessage”：“发生了一个或多个错误。（无法确定内容长度）”，
“stackTrace”：[
“位于System.Threading.Tasks.Task`1.GetResultCore（布尔waitCompletionNotification）”，
“在lambda_方法（闭包、流、流、lambdacontexternal）”
],
“原因”：{
“errorType”：“AmazonS3Exception”，
“errorMessage”：“无法确定内容长度”，
“stackTrace”：[
“在Amazon.S3.Model.Internal.MarshallTransformations.PutObjectRequestMarshalller.GetStreamWithLength（流基流，Int64 hintLength）”中，
“在Amazon.S3.Model.Internal.MarshallTransformations.PutObjectRequestMarshaller.Marshall（PutObjectRequest PutObjectRequest）”中，
“在Amazon.Runtime.Internal.Marshaller.PreInvoke（IExecutionContext executionContext executionContext）”中，
“在Amazon.Runtime.Internal.Marshaller.InvokeAsync[T]（IExecutionContext executionContext executionContext）上”，
“在Amazon.Runtime.Internal.CallbackHandler.d_u9`1.MoveNext（）”，
“---引发异常的上一个位置的堆栈结束跟踪----”，
“在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中，
“在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）”中，
“在Amazon.S3.Internal.AmazonS3ExceptionHandler.d_u1`1.MoveNext（）”，
“---引发异常的上一个位置的堆栈结束跟踪----”，
“在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中，
“在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）”中，
“在Amazon.Runtime.Internal.ErrorCallbackHandler.d_u5`1.MoveNext（）”，
“---引发异常的上一个位置的堆栈结束跟踪----”，
“在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中，
“在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）”中，
“在Amazon.Runtime.Internal.MetricsHandler.d_u1`1.MoveNext（）”，
“---引发异常的上一个位置的堆栈结束跟踪----”，
“在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中，
“在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）”中，
“在C:\\Users\\Acer\\Desktop\\MementoCSharp\\memento dotnet\\AwsS3Lambda\\Function.d_u10.MoveNext（）中的AwsS3Lambda.Function.d_u10.MoveNext（）。cs:第99行”
]
},
“原因”：[
{
“errorType”：“AmazonS3Exception”，
“errorMessage”：“无法确定内容长度”，
“stackTrace”：[
“在Amazon.S3.Model.Internal.MarshallTransformations.PutObjectRequestMarshalller.GetStreamWithLength（流基流，Int64 hintLength）”中，
“在Amazon.S3.Model.Internal.MarshallTransformations.PutObjectRequestMarshaller.Marshall（PutObjectRequest PutObjectRequest）”中，
“在Amazon.Runtime.Internal.Marshaller.PreInvoke（IExecutionContext executionContext executionContext）”中，
“在Amazon.Runtime.Internal.Marshaller.InvokeAsync[T]（IExecutionContext executionContext executionContext）上”，
“在Amazon.Runtime.Internal.CallbackHandler.d_u9`1.MoveNext（）”，
“---引发异常的上一个位置的堆栈结束跟踪----”，
“在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中，
“在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）”中，
“在Amazon.S3.Internal.AmazonS3ExceptionHandler.d_u1`1.MoveNext（）”，
“---来自上一个IOU的堆栈结束跟踪
await this.S3Client.PutObjectAsync(new Amazon.S3.Model.PutObjectRequest
{
    BucketName = s3Event.Bucket.Name,
    Key = fileNameWithoutExtension + ".thumb" + extension,
    InputStream = responseStream
});

await this.S3Client.PutObjectAsync(new Amazon.S3.Model.PutObjectRequest
{
    BucketName = s3Event.Bucket.Name,
    Key = fileNameWithoutExtension + ".thumb" + extension,
    InputStream = responseStream,
    Headers.ContentLength = s3event.object.size
});