CODEWITHSUNDEEP
asp.net-coref#
Rob Lyndon
Rob Lyndon

Reputation: 12681

F# ASP.NET Core project: EntryPointAttribute error

This is my ASP.NET Core Web API entry-point:

open Microsoft.AspNetCore
open Microsoft.AspNetCore.Hosting

module Hosting =
    let BuildWebHost args =
        WebHost
            .CreateDefaultBuilder(args)
            .UseStartup<Startup>()
            .UseIISIntegration()
            .Build()

module Program =
    let [<EntryPoint>] main args = Hosting.BuildWebHost(args).Run(); 0

This is from Program.fs, the final file in my project.

After months of smooth compilation, I am suddenly getting the following compilation failure:

error FS0433: A function labeled with the 'EntryPointAttribute' attribute must be the last declaration in the last file in the compilation sequence.

It is the last declaration in the last file -- any idea why this might suddenly start failing now?

Upvotes: 4

Views: 1004

Answers (1)

Rob Lyndon
Rob Lyndon

Reputation: 12681

This is because the user secrets infrastructure injects a file as the last file in the assembly. It is fixed in the next release of F#: see https://github.com/aspnet/Configuration/issues/833.

There is a workaround here: https://medium.com/@dmytrol/making-asp-net-core-user-secrets-work-in-f-projects-9b04572d81f6, in which you can set your User Secrets ID in your codebase rather than in the project file.

Upvotes: 3

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