如何使用AWS SDK for .NET下载Requester Pays存储桶中的S3对象

算力阿峰

2026-8-13

解决Amazon S3 Requester Pays存储桶的.NET SDK访问问题

Requester Pays存储桶要求请求方承担访问产生的费用，.NET SDK默认不会自动启用该选项，这是导致你访问拒绝的核心原因。以下是两种可行的解决方式：

方法一：使用TransferUtilityDownloadRequest配置请求方付费

通过TransferUtility的重载方法，显式设置RequesterPays属性为true：

static async Task DownloadFile()
{
    var s3Client = new AmazonS3Client(accessKey, secretAccessKey, Amazon.RegionEndpoint.USEast1);
    var transferUtility = new TransferUtility(s3Client);
    
    var downloadRequest = new TransferUtilityDownloadRequest
    {
        BucketName = "data-repository-client-1",
        Key = "20221002-22%2709%2753_to_20221002-22%2723%2715_Trades_v5.csv.gz",
        FilePath = "destination",
        RequesterPays = true // 启用请求方付费标识
    };
    
    await transferUtility.DownloadAsync(downloadRequest);
}

方法二：直接通过GetObjectRequest设置

如果不需要使用TransferUtility，可以直接构造GetObjectRequest并开启请求方付费：

static async Task DownloadFileDirectly()
{
    var s3Client = new AmazonS3Client(accessKey, secretAccessKey, Amazon.RegionEndpoint.USEast1);
    
    var getRequest = new GetObjectRequest
    {
        BucketName = "data-repository-client-1",
        Key = "20221002-22%2709%2753_to_20221002-22%2723%2715_Trades_v5.csv.gz",
        RequesterPays = true
    };
    
    using (var response = await s3Client.GetObjectAsync(getRequest))
    {
        await response.WriteResponseStreamToFileAsync("destination", false, CancellationToken.None);
    }
}