try
{
  // Bucket name in the format of bucketname-APPID. You can get APPID by referring to https://console.tencentcloud.com/developer.
  string bucket = "examplebucket-1250000000";
  GetBucketRequest request = new GetBucketRequest(bucket);
  // Execute the request
  GetBucketResult result = cosXml.GetBucket(request);
  // Bucket information
  ListBucket info = result.listBucket;
  if (info.isTruncated) {
    // The data is truncated, and the next marker of the data is recorded.
    this.nextMarker = info.nextMarker;
  }
}
catch (COSXML.CosException.CosClientException clientEx)
{
  // Request failed
  Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
  // Request failed
  Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}

try
{
  // Bucket name in the format of bucketname-APPID. You can get APPID by referring to https://console.tencentcloud.com/developer.
  string bucket = "examplebucket-1250000000";
  GetBucketRequest request = new GetBucketRequest(bucket);
  // Use the “nextMarker” from the previous request
  request.SetMarker(this.nextMarker);
  // Execute the request
  GetBucketResult result = cosXml.GetBucket(request);
  // Bucket information
  ListBucket info = result.listBucket;
}
catch (COSXML.CosException.CosClientException clientEx)
{
  // Request failed
  Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
  // Request failed
  Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}

try
{
  // Bucket name in the format of bucketname-APPID. You can get APPID by referring to https://console.tencentcloud.com/developer.
  string bucket = "examplebucket-1250000000";
  GetBucketRequest request = new GetBucketRequest(bucket);
  // Get the objects and subdirectories under “a/”
  request.SetPrefix("a/");
  request.SetDelimiter("/");
  // Execute the request
  GetBucketResult result = cosXml.GetBucket(request);
  // Bucket information
  ListBucket info = result.listBucket;
  // List objects
  List<ListBucket.Contents> objects = info.contentsList;
  // List common prefixes
  List<ListBucket.CommonPrefixes> subDirs = info.commonPrefixesList;
}
catch (COSXML.CosException.CosClientException clientEx)
{
  // Request failed
  Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
  // Request failed
  Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}

try
{
  // Bucket name in the format of bucketname-APPID. You can get APPID by referring to https://console.tencentcloud.com/developer.
  string bucket = "examplebucket-1250000000";
  ListBucketVersionsRequest request = new ListBucketVersionsRequest(bucket);
  // Execute the request
  ListBucketVersionsResult result = cosXml.ListBucketVersions(request);
  // Bucket information
  ListBucketVersions info = result.listBucketVersions;

  List<ListBucketVersions.Version> objects = info.objectVersionList;
  List<ListBucketVersions.CommonPrefixes> prefixes = info.commonPrefixesList;

  if (info.isTruncated) {
    // The data is truncated, and the next marker of the data is recorded.
    this.keyMarker = info.nextKeyMarker;
    this.versionIdMarker = info.nextVersionIdMarker;
  }
}
catch (COSXML.CosException.CosClientException clientEx)
{
  // Request failed
  Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
  // Request failed
  Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}

try
{
  // Bucket name in the format of bucketname-APPID. You can get APPID by referring to https://console.tencentcloud.com/developer.
  string bucket = "examplebucket-1250000000";
  ListBucketVersionsRequest request = new ListBucketVersionsRequest(bucket);

  // Use the “nextMarker” from the previous request
  request.SetKeyMarker(this.keyMarker);
  request.SetVersionIdMarker(this.versionIdMarker);

  // Execute the request
  ListBucketVersionsResult result = cosXml.ListBucketVersions(request);
  ListBucketVersions info = result.listBucketVersions;

  if (info.isTruncated) {
    // The data is truncated, and the next marker of the data is recorded.
    this.keyMarker = info.nextKeyMarker;
    this.versionIdMarker = info.nextVersionIdMarker;
  }
}
catch (COSXML.CosException.CosClientException clientEx)
{
  // Request failed
  Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
  // Request failed
  Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}