哪个.Net集合可以一次添加多个对象并收到通知？

using TencentCloud.Cos.V4;
using TencentCloud.Cos.V4.Model;

public class COSExample
{
    public static void Main(string[] args)
    {
        // 初始化 COS 客户端
        CosClient cosClient = new CosClient(new CosClientOptions()
        {
            SecretId = "your_secret_id",
            SecretKey = "your_secret_key",
            Region = "your_region"
        });

        // 创建一个存储桶
        string bucketName = "your_bucket_name";
        PutBucketRequest putBucketRequest = new PutBucketRequest(bucketName);
        cosClient.PutBucket(putBucketRequest);

        // 上传多个对象
        List<string> objectKeys = new List<string>() { "object1", "object2", "object3" };
        List<PutObjectRequest> putObjectRequests = new List<PutObjectRequest>();
        foreach (string objectKey in objectKeys)
        {
            PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectKey, new MemoryStream(Encoding.UTF8.GetBytes("Hello, COS!")));
            putObjectRequests.Add(putObjectRequest);
        }

        // 一次添加多个对象并收到通知
        TransferUtility transferUtility = new TransferUtility(cosClient);
        transferUtility.UploadDirectory(putObjectRequests);

        // 删除存储桶
        DeleteBucketRequest deleteBucketRequest = new DeleteBucketRequest(bucketName);
        cosClient.DeleteBucket(deleteBucketRequest);
    }
}