Thanks.

I should have mentioned about “ref” in the post for completeness. Caution while mixing structures and events - is the point I wanted to make.

Although not always the case, it is useful to think cautiously when using structures and events together. In some cases, particularly for very lightweight structures (shouldn’t all be?), an event can be useful. In these rare situations, care should be used. For example, the real problem in the sample code is the missing ‘ref’ to ensure that HookOntoEvent receives a reference to the SomeStruct instance, rather than a copy of the structure. Of course, if the structure is quite large then consideration should be made to using a class instead.