ListObjectsEnumAsync gives an System.Xml.XmlException: Root element is missing.

[wouterDevelop]

I tried to implement the new ListObjectsEnumAsync function. But when I execute it, the code crashed and gives the following error:

    An unhandled exception has occurred while executing the request.
      System.Xml.XmlException: Root element is missing.
         at System.Xml.XmlTextReaderImpl.Throw(Exception e)
         at System.Xml.XmlTextReaderImpl.ThrowWithoutLineInfo(String res)
         at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
         at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
         at System.Xml.Linq.XDocument.Load(Stream stream, LoadOptions options)
         at Minio.MinioClient.ListObjectsEnumAsync(ListObjectsArgs args, CancellationToken cancellationToken)+MoveNext()
         at Minio.MinioClient.ListObjectsEnumAsync(ListObjectsArgs args, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()

when I have logging enabled, I get I think a getting a valid xml from the minio server

<?xml version="1.0" encoding="UTF-8"?>
<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Name>mediastorage</Name><Prefix></Prefix><KeyCount>3</KeyCount><MaxKeys>1000</MaxKeys><IsTruncated>false</IsTruncated><Contents><Key>7c9c9a49-8818-4d94-a2bc-d59e4caf6fea</Key><LastModified>2024-09-29T12:36:51.211Z</LastModified><ETag>&#34;449f26d4372db066e6ea857935e74c10&#34;</ETag><Size>95476</Size><StorageClass>STANDARD</StorageClass></Contents><Contents><Key>936d03a9-971a-495b-a980-87c72fd69037_IMG_0343.jpg</Key><LastModified>2024-09-29T13:11:17.382Z</LastModified><ETag>&#34;449f26d4372db066e6ea857935e74c10&#34;</ETag><Size>95476</Size><StorageClass>STANDARD</StorageClass></Contents><Contents><Key>a1b9b74b-3628-430a-890e-2546d225c714</Key><LastModified>2024-09-29T13:00:46.271Z</LastModified><ETag>&#34;449f26d4372db066e6ea857935e74c10&#34;</ETag><Size>95476</Size><StorageClass>STANDARD</StorageClass></Contents><EncodingType>url</EncodingType></ListBucketResult>

this is the code is used to get the objects:

            .WithBucket(BUCKETNAME)
                .WithPrefix(null)
                .WithRecursive(true)
                .WithVersions(false);


        var photos = new List<Photo>();


        await foreach (var item in _minioClient.ListObjectsEnumAsync(listArgs))
        {

            photos.Add(new Photo
            {
                Src = item.Key,
                CreatedAt = item.LastModifiedDateTime,

            });

        }

I hope someone can figure out what's wrong here

[davidlahuta]

Any luck? How did you resolve this?

[aroquemaurel]

Hello,
I had the same exact issue, but i have fixed it when I removed the SetTraceOn. So I suppose there is a bug here, when the travec is enabled, somewhere the stream seems to be consume and so the ListObjectsEnumAsync is not working anymore.

Basically, the first code has the error, but not the second.

    var minio = new MinioClient()
                .WithEndpoint("127.0.0.1:9000")
                .WithCredentials("JZRk76FAXRZOab8yoVl0", "dgApzvqZYRbxcnZ59RLYEwNvnBvb0HmgfI5nVK9G")
                .WithSSL(false)
                .Build();
    minio.SetTraceOn(new DefaultRequestLogger(_logger));
    var listArgs = new ListObjectsArgs()
                   .WithBucket("bucket1")
                   .WithRecursive(true);
    await foreach (var item in minio.ListObjectsEnumAsync(listArgs).ConfigureAwait(false)) // Root xml exception here
    {
      _logger.LogInformation("Item: {Item}", item.Key);
    }

This code is working :

    var minio = new MinioClient()
                .WithEndpoint("127.0.0.1:9000")
                .WithCredentials("JZRk76FAXRZOab8yoVl0", "dgApzvqZYRbxcnZ59RLYEwNvnBvb0HmgfI5nVK9G")
                .WithSSL(false)
                .Build();
    var listArgs = new ListObjectsArgs()
                   .WithBucket("bucket1")
                   .WithRecursive(true);
    await foreach (var item in minio.ListObjectsEnumAsync(listArgs).ConfigureAwait(false))
    {
      _logger.LogInformation("Item: {Item}", item.Key); // logs ok
    }

Anyone can take a look to fix this ?

Thanks