Sets an ETag to be matched as a pre-condition for returning the object,
otherwise a PreconditionFailed signal is returned.

C# |
[ObsoleteAttribute("The With methods are obsolete and will be removed in version 2 of the AWS SDK for .NET. See http://aws.amazon.com/sdkfornet/#version2 for more information.")] public GetObjectRequest WithETagToMatch( string etagToMatch )

- etagToMatch (String)
- The ETag to match

this instance

When this is set the S3 object is returned only if its entity tag (ETag) is the same as the one specified,
otherwise return a 412 (precondition failed).