如何在.Net中过滤亚马逊s3对象？

Question

我在Amazon s3 Bucket中有多个对象，每个对象都有一个自定义元数据（＆＃34; x-amz-meta-cod＆＃34;）。我按以下方式放置元数据：

putRequest2.Metadata.Add("x-amz-meta-cod", "53");

因此，为了查询我的所有对象，我按以下方式进行：

 static void ListObjects()
    {
        try
        {
            ListObjectsV2Request request = new ListObjectsV2Request
            {
                BucketName = "test",

            };
            ListObjectsV2Response response;
            do
            {
                response = client.ListObjectsV2(request);

                // Process response.
                foreach (S3Object entry in response.S3Objects)
                {
                    Console.WriteLine("key = {0} Size = {1}",
                        entry.Key, entry.Size);
                }
                Console.WriteLine("Next Continuation Token: {0}", response.NextContinuationToken);
                request.ContinuationToken = response.NextContinuationToken;
            } while (response.IsTruncated == true);
        }
        catch (AmazonS3Exception amazonS3Exception)
        {
            if (amazonS3Exception.ErrorCode != null &&
                (amazonS3Exception.ErrorCode.Equals("InvalidAccessKeyId")
                ||
                amazonS3Exception.ErrorCode.Equals("InvalidSecurity")))
            {
                Console.WriteLine("Check the provided AWS Credentials.");
                Console.WriteLine(
                "To sign up for service, go to http://aws.amazon.com/s3");
            }
            else
            {
                Console.WriteLine(
                 "Error:'{0}'",
                 amazonS3Exception.Message);
            }
        }
    }

我的问题是，如何只使用＆＃34; x-amz-meta-cod＆＃34; =＆＃34; 50＆＃34; ？ 我需要帮助！感谢。