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Attachments: How to update an attachment metadata only?

UpdateAttachmentMetadata is used to update an attachment metadata in a database.

Syntax​

void UpdateAttachmentMetadata(string key, Etag etag, RavenJObject metadata);
Parameters
keystringkey under which attachment is stored
etagEtagcurrent attachment etag, used for concurrency checks (null to skip check)
metadataRavenJObjectattachment metadata

Example​

JsonDocumentMetadata attachment = store.DatabaseCommands.Head("albums/holidays/sea.jpg");
RavenJObject metadata = attachment.Metadata;
metadata["Description"] = "Holidays 2012";

store
.DatabaseCommands
.UpdateAttachmentMetadata("albums/holidays/sea.jpg", attachment.Etag, metadata);