Setting Lifecycle Rules

// Initialize configuration parameters.
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/eu/usermanual-ca/ca_01_0003.html.
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// Create an instance of ObsClient.
ObsClient client = new ObsClient(accessKey, secretKey, config);
//Set an object transition policy.
try
{
    SetBucketLifecycleRequest request = new SetBucketLifecycleRequest();
    request.BucketName = "bucketname";
    request.Configuration = new LifecycleConfiguration();
    LifecycleRule rule1 = new LifecycleRule();
    rule1.Id = "rule1";
    rule1.Prefix = "prefix";
    rule1.Status = RuleStatusEnum.Enabled;
    Transition transition = new Transition();
    rule1.Transitions.Add(transition);     
    // Specify that objects whose names contain the specified prefix will be transitioned 30 days after creation.
    transition.Days = 30;
    // Specify the storage class that the object will be transitioned to.
    transition.StorageClass = StorageClassEnum.Warm;
    NoncurrentVersionTransition noncurrentVersionTransition  = new NoncurrentVersionTransition();
    rule1.NoncurrentVersionTransitions.Add(noncurrentVersionTransition);
    // Specify that objects whose names contain the specified prefix will be transitioned 60 days after becoming noncurrent versions.
    noncurrentVersionTransition.NoncurrentDays = 60;
    // Specify the storage class that a noncurrent version will be transitioned to.
    noncurrentVersionTransition.StorageClass = StorageClassEnum.Warm;
    request.Configuration.Rules.Add(rule1);
    SetBucketLifecycleResponse response = client.SetBucketLifecycle(request);
    Console.WriteLine("Set bucket lifecycle response: {0}", response.StatusCode);
}
catch (ObsException ex)
{
    Console.WriteLine("ErrorCode: {0}", ex.ErrorCode);
    Console.WriteLine("ErrorMessage: {0}", ex.ErrorMessage);
}