Found it out.
I have to use the contextobject:
ERP_EMIModelContainer context = new ERP_EMIModelContainer();
and now I do this:
int numberOfEntities = context.MetadataWorkspace.GetEntityContainer(context.DefaultContainerName, DataSpace.CSpace).BaseEntitySets.Count;
btw Thanks for downvoting the question …
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solved Get/Count Number of Entities? [closed]