C#新手.

我正在try 编写一些代码，它将从一个AWS帐户复制S3存储桶内容，并使用AWS SDK将它们放入另一个S3帐户.

我的问题是，虽然文件名出现在目标存储桶中，但内容/文件似乎已损坏. 作为测试，我让它复制并移动了一个图像. 源映像是193KB，但目标存储桶中的文件是339KB，这似乎有点小.

以下是我的代码. 以ListAndCopyObjects方法作为入口点开始. 客户端，已在代码的另一部分中定义了目标客户端. 如有任何帮助，我们不胜感激. 我已经在这个问题上苦苦思索好几天了.

public static async Task ListAndCopyObjects(string bucketName, string folderName, AmazonS3Client client)
        {
            // Read all bucket files
            Console.WriteLine("Listing Objects");
            var listObjects = client.Paginators.ListObjectsV2(new ListObjectsV2Request()
            {
                BucketName = bucketName,
                Prefix = folderName,
                StartAfter = folderName
            });
            
            Console.WriteLine("Loop through Files");
            
            await foreach (var response in listObjects.Responses)
            {
                Console.WriteLine($"HttpStatusCode: {response.HttpStatusCode}");
                Console.WriteLine($"Number of Keys: {response.KeyCount}");
                foreach (var entry in response.S3Objects)
                {
                    Console.WriteLine($"Key = {entry.Key} Size = {entry.Size}");
                    //Download file data
                    NameValueCollection fileContent = await DownloadObject(client, bucketName, entry.Key);
                    
                    Console.WriteLine(fileContent);
                    //Upload file
                    await UploadObject(destinationClient, Environment.GetEnvironmentVariable("DESTINATION_BUCKET"),
                        entry.Key, fileContent);
                }
            }
        }

        private static async Task<bool> UploadObject(AmazonS3Client client, string bucketName, string objectName, 
            NameValueCollection fileContents)
        {
            var request = new PutObjectRequest
            {
                BucketName = bucketName,
                Key = objectName,
                ContentBody = fileContents["content"],
                ContentType = fileContents["contentType"]
            };

            var response = await client.PutObjectAsync(request);
            if (response.HttpStatusCode == System.Net.HttpStatusCode.OK)
            {
                Console.WriteLine($"Successfully uploaded {objectName} to {bucketName}.");
                return true;
            }
            else
            {
                Console.WriteLine($"Could not upload {objectName} to {bucketName}.");
                return false;
            }
        }
        
        private static async Task<NameValueCollection> DownloadObject(AmazonS3Client client, string bucketName, string objectName)
        {
            Console.WriteLine("Downloading File");
            NameValueCollection fileData = new NameValueCollection();
            try
            {
                GetObjectRequest request = new GetObjectRequest
                {
                    BucketName = bucketName,
                    Key = objectName
                };
                using (GetObjectResponse response = await client.GetObjectAsync(request))
                using (Stream responseStream = response.ResponseStream)
                using (StreamReader reader = new StreamReader(responseStream))
                {
                    string title = response.Metadata["x-amz-meta-title"];
                    string contentType = response.Headers["Content-Type"];
                    Console.WriteLine("Object metadata, Title: {0}", title);
                    Console.WriteLine("Content type: {0}", contentType);

                    fileData["contentType"] = contentType;
                    fileData["content"] = reader.ReadToEnd();
                    
                    return fileData;
                }
            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine("Error encountered ***. Message:'{0}' when writing an object", e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
            }

            return fileData;
        }