AWS SDK for .NET Documentation
KeyPrefix Property
AmazonAmazon.S3.TransferTransferUtilityUploadDirectoryRequestKeyPrefix Did this page help you?   Yes   No    Tell us about it...
Gets or sets the KeyPrefix property. As object keys are generated for the files being uploaded this value will prefix the key. This is useful when a directory needs to be uploaded into sub directory in the S3 Bucket.
Declaration Syntax
C#
public string KeyPrefix { get; set; }
Value
The directory where files are uploaded from.

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)