c# - 如何从 S3 获取 GetObjectResponse 的字节？

Question

我正在从 Amazon S3 检索文件。我想将文件转换为字节，以便我可以按如下方式下载它:

var download = new FileContentResult(bytes, "application/pdf");
download.FileDownloadName = filename;
return download;

我这里有文件:

var client = Amazon.AWSClientFactory.CreateAmazonS3Client(
        accessKey,
        secretKey,
        config
        );
GetObjectRequest request = new GetObjectRequest();
GetObjectResponse response = client.GetObject(request);          

我知道 response.WriteResponseStreamToFile() 但我想将文件下载到常规下载文件夹。如果我将 GetObjectResponse 转换为字节，我可以返回该文件。我该怎么做？

Answer 1

这是我为任何需要它的人找到的解决方案:

GetObjectResponse response = client.GetObject(request);
using (Stream responseStream = response.ResponseStream)
{
    var bytes = ReadStream(responseStream);
    var download = new FileContentResult(bytes, "application/pdf");
    download.FileDownloadName = filename;
    return download;
}

---

public static byte[] ReadStream(Stream responseStream)
{
    byte[] buffer = new byte[16 * 1024];
    using (MemoryStream ms = new MemoryStream())
    {
        int read;
        while ((read = responseStream.Read(buffer, 0, buffer.Length)) > 0)
        {
            ms.Write(buffer, 0, read);
        }
        return ms.ToArray();
    }
}