Global constants in F# - how to

问题

I need to set a version number to be used in the AssemblyVersion attribute by several related projects.

In C# I use the following

public class Constants {
    public const string Version = "1.2.3.4";
}

then it can be used as follows:

[assembly:AssemblyVersion(Constants.Version)]

What would be the equivalent construct in F#. All my attempts to come up with a binding which can be accepted as an attribute argument did not work.

回答1:

Use the attribute Literal:

[<Literal>] 
let version = "1.2.3.4"

[<assembly:AssemblyVersion(version)>]

回答2:

Since I stepped into this trap myself I thought I'd share for anyone following. A 'Literal' requires that the letter starts with a capital letter. This will hit you when you try to use the literal in a pattern matching construct.

Reference: Literal attribute not working

来源：https://stackoverflow.com/questions/2326398/global-constants-in-f-how-to