Obtaining Object Properties

You can call ObsClient.GetObjectMetadata to obtain object properties, including the last modification time, version ID, and customized metadata. The sample code is as follows:

// Initialize configuration parameters.
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// Hard-coded or plaintext AK and SK are risky. For security purposes, encrypt your AK and SK before storing them in the configuration file or environment variables. In this example, the AK and SK are stored in environment variables. Before running the code in this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/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);

try
{
    GetObjectMetadataRequest request = new GetObjectMetadataRequest();
    // Specify a bucket name.
    request.BucketName = "bucketname";
    // Specify an object (example/objectname in this example).
    request.ObjectKey = "example/objectname";
    // Obtain the object metadata.
    using (GetObjectMetadataResponse response = client.GetObjectMetadata(request)) {
       Console.WriteLine("Get object metadata response: {0}", response.StatusCode);
       // Obtain the ETag of the object.
       Console.WriteLine("Object etag {0}:  ", response.ETag);
    // Obtain the object version ID.
       Console.WriteLine("Object versionId {0}:  ", response.VersionId);
    // Obtain the length of the object data, in bytes.
       Console.WriteLine("Object contentLength {0}:  ", response.ContentLength);
    }
}
catch (ObsException ex)
{
   Console.WriteLine("Message: {0}", ex.Message);
}