linkTo from C#

EventStoreDB
1

I have a use case where I would like to write linkTo events from C# code. Is it simply a matter of https://github.com/EventStore/EventStore/blob/master/src/EventStore.Core.Tests/ClientAPI/SpecificationWithLinkToToMaxCountDeletedEvents.cs#L26 or is it more involved? If I add metadata to this event (I would need to put a checkpoint in there), where does it show up? OriginalEvent?

2

Drop me a note offline I’m doing this in competing and can explain more

3

Hi Greg and João,

Did you come to any conclusions on how to write linkTo events from C# code? I have a use case that would make use of this feature.

Thanks,

Anne

4

Yes if you look at messageparker under persistent subbscripion service it even does it. Im on phone will link later

5

Sorry for the delay I am at a computer now and can give you a direct link.

A linkTo is just a special type of event "$>"

Here is some code to help you out

https://github.com/EventStore/EventStore/blob/dev/src/EventStore.Core/Services/PersistentSubscription/PersistentSubscriptionMessageParker.cs#L50

Also note the event type must be SystemEventTypes.LinkTo

https://github.com/EventStore/EventStore/blob/f0e38e85aa473b7b4c57f1e413661da86e828e31/src/EventStore.ClientAPI/Common/SystemNames.cs#L47

@all we might want to expose SystemNames to the Client API?

Cheers,

Greg

6

I just added a PR to make SystemEventTypes public so you can use it in future versions.

Not that we are likely to change it but probably best to use the constant :slight_smile:

7

This is great - thank you!

When will SystemEventTypes be public?

Thanks,

Anne

8

It is in dev i believe now