C#•3y ago

✅ Anonymous type

So while is was reading about LINQ I stumbled upon an example that only works with

var

var

var

var due to being an anonymous function.

They showed the following:

jorenOP•10/21/23, 11:11 AM

what does new { ... }new { ... } yield here, an anonymous type but what is it deducted too

jorenOP•10/21/23, 11:12 AM

they wrote it as if only

var

var

would work as there is no explicit type one could write there that'd match it

jorenOP•10/21/23, 11:13 AM

does it generate a basic struct with name and phone as members and uses init list to initialize them ({get; init;}{get; init;})

jorenOP•10/21/23, 11:13 AM

I come from C++ and this would be deducted to a type one could type/refer to explicitly, if not, it would not compile to begin with.

x0rld•10/21/23, 11:16 AM

https://sharplab.io/#v2:EYLgtghglgdgPgNwgJwASojA9jVBeVGAUwHdUBvGCMI/VAIipvoBpUAHACxyL3oAYAbAA5RY0fQC+AbiA===
the compiler generate a generic class

SharpLab

C#/VB/F# compiler playground.

Xx0rld https://sharplab.io/#v2:EYLgtghglgdgPgNwgJwASojA9jVBeVGAUwHdUBvGCMI/VAIipvoBpUAH...

InsertPi•10/21/23, 11:16 AM

would this semantically be a record?

InsertPi•10/21/23, 11:16 AM

it looks like it to me but i cant say for certain

x0rld•10/21/23, 11:17 AM

looks like yeah

x0rld•10/21/23, 11:17 AM

I tried to re assign the value

x0rld•10/21/23, 11:19 AM

the record implement IEquatable<T> and the anonymous object doesn't

InsertPi•10/21/23, 11:20 AM

huh

InsertPi•10/21/23, 11:20 AM

this is bizarre, tbh i didnt even think this was possible

x0rld•10/21/23, 11:21 AM

that would be weird to compare 2 anyonymous objects that seems legit for me xD

jorenOP•10/21/23, 11:42 AM

I've got bad internet here on holiday, would someone be able to paste the code

jorenOP•10/21/23, 11:42 AM

from the playground

jorenOP•10/21/23, 11:44 AM

nvm it loaded finally, ok makes sense - I already dont like that lol.

x0rld•10/21/23, 11:46 AM

you still can create a record or a class if you don't want use anon type

Trinitek•10/21/23, 12:30 PM

https://learn.microsoft.com/en-us/dotnet/standard/base-types/choosing-between-anonymous-and-tuple for your reading pleasure

Choosing between anonymous and tuple types - .NET

Learn when it's appropriate to choose between anonymous types, and tuple type.

Trinitek•10/21/23, 12:30 PM

anon types are old, introduced in C# 3

TheBoxyBear•10/21/23, 4:09 PM

You should still be able to reference it as an

object

object

instead of using

var

var

. If you paste the code, hovering the query variable will reveal the declared type inside IEnumerable<>IEnumerable<>.

var

var

is just a shorthand that gets replaced with the declared type of the value you give it, nullable if it's a reference type.

Accord•10/22/23, 4:14 PM

Was this issue resolved? If so, run

/close

/close

otherwise I will mark this as stale and this post will be archived until there is new activity.

✅ Anonymous type

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