Forward type declaration with two files

问题

I have two files.

File 1:

namespace A

type A1() = 
   // ....

File 2:

namespace A

type A2() = 
   // ....

I can use A1 and A2 types in File 2, but I can see only A1 in File 1. I think it is because compiler don't know about A2 when it is parsing File 1.

Is there any way to make something like forward type declaration in this case ? Or to change the order of parsing the source files by compiler. It will be enough for me to have A1 and A2 in File1, and only A2 in File1.

Update:

I believe it is not dublicate of this question. I know about and keyword in the type declaration, but I can not merge two different files in one (See question title).

回答1:

change the order of parsing the source files

This can be done by changing the order of the files in Visual Studio: right-click and Move Up respectively Move Down

回答2:

If you have the F# Power Tools installed, Alt-UpArrow and Alt-DownArrow also work, IIRC.

来源：https://stackoverflow.com/questions/31086071/forward-type-declaration-with-two-files