Question

我使用了非常基本的代码从Amazon S3下载文件。我试过两个不同的代码。

评论GetObjectResponse投掷错误

的评论

System.Xml.XmlException: There are multiple root elements. Line 2, position 2.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.Throw(String res, String arg)
at System.Xml.XmlTextReaderImpl.Throw(Int32 pos, String res)
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlTextReader.Read()

等，

包含TransferUtilityDownloadRequest的代码。我不确定这种方法是否正确。在Amazon Site中找到了类似的例子。

源代码

  private static void AmazonS3Access()
    {
        string accessKey = "my_access_key";
        string secretKey = "my_secret_key";

        AmazonS3Config config = new AmazonS3Config();
        config.ServiceURL = "s3.amazonaws.com";

        AmazonS3 client = Amazon.AWSClientFactory.CreateAmazonS3Client(
                accessKey,
                secretKey,
                config);
        GetObjectRequest request = new GetObjectRequest();
        request.BucketName = "bucket";
        request.Key = "myfile.extension";
        try
        {
            TransferUtilityDownloadRequest myfile = new TransferUtilityDownloadRequest();                
            myfile.WithBucketName(request.BucketName);
            myfile.WithKey(request.Key);
            myfile.WithFilePath("D:\\S3File\\myfile.extension");  
            //GetObjectResponse response = client.GetObject(request);
            //response.WriteResponseStreamToFile("D:\\S3File\\myfile.extension");
        }
        catch (Exception Ex)
        {
            Console.WriteLine(Ex.ToString());
        }
    }

如何从Amazon S3下载对象。提前谢谢。

注意：

使用VS 2010和.NetFramework 3.5
使用AmazonSDK.dll旧版本

解决方案：

在程序中添加网络代理凭据后，它开始正常工作。

Answer 1

public Stream DownloadS3Object（string awsBucketName，string keyName）

    {
        using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client())
        {
            Stream imageStream = new MemoryStream();
            GetObjectRequest request = new GetObjectRequest { BucketName = awsBucketName, Key = keyName };
            using (GetObjectResponse response = client.GetObject(request))
            {
                response.ResponseStream.CopyTo(imageStream);
            }
            imageStream.Position = 0;
            // Clean up temporary file.
            // System.IO.File.Delete(dest);
            return imageStream;
        }
    }

传递函数获取流路径中的值将其保存在文件夹中，使用下面的内容。

SaveStreamToFile（foldername +“/”，MainStreamAwsPath）;

并且您可以应用简单的c＃代码来下载该文件夹。

还从aws.amazon.com/sdkfornet下载.net的最新AWS SDK并在项目中添加该dll

Answer 2

    public Stream DownloadS3Object(string awsBucketName, string keyName)

    {
        using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client())
        {
            Stream imageStream = new MemoryStream();
            GetObjectRequest request = new GetObjectRequest { BucketName = awsBucketName, Key = keyName };
            using (GetObjectResponse response = client.GetObject(request))
            {
                response.ResponseStream.CopyTo(imageStream);
            }
            imageStream.Position = 0;
            // Clean up temporary file.
            // System.IO.File.Delete(dest);
            return imageStream;
        }
    }

注意：

使用VS 2010与.Net Framework 3.5 我使用的是Amazon SDK.dll旧版本

使用C＃从Amazon S3存储桶下载对象时出错

2 个答案: