BUG: can't hook up toDump extension method with F# program

MaslowB

per https://www.linqpad.net/CustomizingDump.aspx
I should be able to make it customize the dump of a `Newtonsoft.Json.Linq.JProperty`

However, no matter what I try, (trying not to use MyExtensions since it is C# only) it won't hook up

http://share.linqpad.net/jhwfi2.linq

produces just the value, not the name and value, nor do any of the print statements get hit.

JoeAlbahari

The global ToDump hook is only valid in My Extensions, not individual queries.

I've taken a look at whether it would easy to allow My Extensions to be written in F#, but unfortunately, there's a fair bit of work involved. So the only option right now is to write the ToDump in C#.

MaslowB

I was under the impression that you could use C# extension methods to customize dump behavior in individual queries, is that not the case? One of my attempts above should be seen by C# as toDump extension methods on object.

MaslowB

Any word on this possibility? Are all the ToDump hooks, available to F#, only available per type, with no ability to hook in or inject?

MaslowB

type Newtonsoft.Json.Linq.JProperty with
    member x.ToDump() = x.Name
    member x.toDump() = x.Name

is something like this possible?

MaslowB

Can we please have a way to hook/override type-specific (for types we aren't creating) (or global) dumping in linqpad for F#?

MaslowB

@JoeAlbahari is this still entirely unavailable in F# to localized types?

JoeAlbahari

ToDump is recognized in two places the moment:

• As a static method is My Extensions. Then it executes for all types.
• As an instance method on the type itself being dumped.

LINQPad does not look for ToDump methods defined via F# type extensions. It could end up being quite a lot of work to implement this in LINQPad reliably. FWIW, there's no C# solution for this either: right now, a static ToDump method is recognized only in My Extensions and not in individual queries.