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使用适用于 .NET 的 AWS 开发工具包分段上传 API 复制 Amazon S3 对象

以下 C# 示例说明如何使用 适用于 .NET 的 AWS 开发工具包 将大于 5 GB 的 Amazon S3 对象从一个源位置复制到另一个源位置,例如从一个存储桶复制到另一个存储桶。要复制小于 5 GB 的对象,请使用使用适用于 .NET 的 AWS 开发工具包在单个操作中复制 Amazon S3 对象中所述的单个操作复制过程。有关 Amazon S3 分段上传的更多信息,请参阅分段上传概述

此示例说明如何使用 适用于 .NET 的 AWS 开发工具包 分段上传 API 将大于 5 GB 的 Amazon S3 对象从一个 S3 存储桶复制到另一个存储桶。有关开发工具包兼容性的信息以及有关创建和测试有效示例的说明,请参阅运行 Amazon S3 .NET 代码示例

// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazon-s3-developer-guide/blob/master/LICENSE-SAMPLECODE.) using Amazon.S3; using Amazon.S3.Model; using System; using System.Collections.Generic; using System.Threading.Tasks; namespace Amazon.DocSamples.S3 { class CopyObjectUsingMPUapiTest { private const string sourceBucket = "*** provide the name of the bucket with source object ***"; private const string targetBucket = "*** provide the name of the bucket to copy the object to ***"; private const string sourceObjectKey = "*** provide the name of object to copy ***"; private const string targetObjectKey = "*** provide the name of the object copy ***"; // Specify your bucket region (an example region is shown). private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2; private static IAmazonS3 s3Client; public static void Main() { s3Client = new AmazonS3Client(bucketRegion); Console.WriteLine("Copying an object"); MPUCopyObjectAsync().Wait(); } private static async Task MPUCopyObjectAsync() { // Create a list to store the upload part responses. List<UploadPartResponse> uploadResponses = new List<UploadPartResponse>(); List<CopyPartResponse> copyResponses = new List<CopyPartResponse>(); // Setup information required to initiate the multipart upload. InitiateMultipartUploadRequest initiateRequest = new InitiateMultipartUploadRequest { BucketName = targetBucket, Key = targetObjectKey }; // Initiate the upload. InitiateMultipartUploadResponse initResponse = await s3Client.InitiateMultipartUploadAsync(initiateRequest); // Save the upload ID. String uploadId = initResponse.UploadId; try { // Get the size of the object. GetObjectMetadataRequest metadataRequest = new GetObjectMetadataRequest { BucketName = sourceBucket, Key = sourceObjectKey }; GetObjectMetadataResponse metadataResponse = await s3Client.GetObjectMetadataAsync(metadataRequest); long objectSize = metadataResponse.ContentLength; // Length in bytes. // Copy the parts. long partSize = 5 * (long)Math.Pow(2, 20); // Part size is 5 MB. long bytePosition = 0; for (int i = 1; bytePosition < objectSize; i++) { CopyPartRequest copyRequest = new CopyPartRequest { DestinationBucket = targetBucket, DestinationKey = targetObjectKey, SourceBucket = sourceBucket, SourceKey = sourceObjectKey, UploadId = uploadId, FirstByte = bytePosition, LastByte = bytePosition + partSize - 1 >= objectSize ? objectSize - 1 : bytePosition + partSize - 1, PartNumber = i }; copyResponses.Add(await s3Client.CopyPartAsync(copyRequest)); bytePosition += partSize; } // Set up to complete the copy. CompleteMultipartUploadRequest completeRequest = new CompleteMultipartUploadRequest { BucketName = targetBucket, Key = targetObjectKey, UploadId = initResponse.UploadId }; completeRequest.AddPartETags(copyResponses); // Complete the copy. CompleteMultipartUploadResponse completeUploadResponse = await s3Client.CompleteMultipartUploadAsync(completeRequest); } catch (AmazonS3Exception e) { Console.WriteLine("Error encountered on server. 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); } } } }

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适用于 .NET 的 AWS 开发工具包

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