AWS S3 buffer size not increasing

问题

I am creating an S3 client with a modified buffer size, however, it does not seem to make a difference as always the same amount of bytes is read from the stream. Example code:

var s3Client = new AmazonS3Client(access, secret, token, new AmazonS3Config
{
     RegionEndpoint = Amazon.RegionEndpoint.USEast1,
     BufferSize = 1000000, // 1 MB (completely arbitrary)
});

await s3Client.PutObjectAsync(new PutObjectRequest 
{
     Key = fileName,
     Bucket = bucketName,
     InputStream = new MyCustomStream(...)
});

When I debug this example, however, instead of reading a megabyte at a time from MyCustomStream, the buffer size is 81920 bytes which is the default for Stream. This leads me to think that the AWS implementation has not overridden the size.

From the documentation I assume that this is the correct property - int BufferSize : The BufferSize controls the buffer used to read in from input streams and write out to the request. I am indeed reading from an input stream so I would expect that this would get overridden.

来源：https://stackoverflow.com/questions/61917654/aws-s3-buffer-size-not-increasing