Do initonly properties work for factory methods?

[msedi]

Assume I have a struct

public struct Point
{
  public double X  {get; init;}
  public double Y  {get; init;}
}

I assume the init-only does not work for factory methods:

public static Point Create() => new Point();

so I cannot write

  Create().X = 10;

correct?
If it doesn't work would it be worth a proposal such that factory methods still allow access to init only properties? I know this bears a lot of problems, but I think it's worth to think about it.

[Joe4evr]

I don't think it's going to be in 9.0, but the idea that the LDT wants to do is allowing to annotate the factory method with an attribute (eg. [Factory]) which the compiler recognizes and will limit what you can actually return (only new and the return value of other [Factory] methods), and that will let you add an object initializer at the callsite. More information here (the example is on With(), but that's just a special case of the more general feature).

[ufcpp]

https://github.com/dotnet/csharplang/blob/master/meetings/2020/LDM-2020-04-20.md

We'll consider broader Factory scenarios later.

[msedi]

Thanks to both of you.