what's best way to check if a S3 object exists?

Question

Currently, I make a GetObjectMetaDataRequest, if the GetObjectMetaDataResponse throw an exception means the object doesn't exist. Is there a better way to check whether the file exists without downloading the file.

Answer 1

you can use S3FileInfo class and Exists method of this class it will hep you to check if file exists without download the file .see the example below I used the AWSSDK 3.1.6 .net(3.5) :

public static  bool ExistsFile()
{
    BasicAWSCredentials basicCredentials = new BasicAWSCredentials("my access key", "my secretkey");
                AmazonS3Config configurationClient = new AmazonS3Config();
                configurationClient.RegionEndpoint = RegionEndpoint.EUCentral1;

                try
                {
                    using (AmazonS3Client clientConnection = new AmazonS3Client(basicCredentials, configurationClient))
                    {

                        S3FileInfo file = new S3FileInfo(clientConnection, "mybucket", "FolderNameUniTest680/FileNameUnitTest680");
                        return file.Exists;//if the file exists return true, in other case false
                    }
                }
                catch(Exception ex)
                {
                    return false;
                }
    }