Modifying Generated web.config file with net core 2 when running on IIS

Question

I have a webapi 2.0 which I am publishing using ftp to my windows 2012 server running IIS 8.5.

I ran into an issue which I can resolved using this link here;

Error 405 – Methods not Allowed in ASP.NET Core PUT and DELETE requests

so by adding;

<modules runAllManagedModulesForAllRequests="false">
    <remove name="WebDAVModule" />
</modules>

I can fix my PUT and DELETE issues, however whenever I publish I am having to physically edit the web.config to reflect the addition of the above code?

Can anyone tell me how to automatically add this when I publish using ftp with web deploy?

My program.cs has the default build in it;

        public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>()
            .Build();

In one of my deployments I have a Powershell script to modify the contents of web.config, then I execute it as a pre-publish target. — Valuator
– Valuator, Commented May 2, 2018 at 14:47
ok do you have an example you could post I can live with that solution? I assume there no way to pipe into the process when its created then? — Matthew Flynn
– Matthew Flynn, Commented May 2, 2018 at 14:53
There could be, I'm just not aware of it. web.config isn't really part of ASP.NET Core, it's just there for IIS compatibility. I get the impression it wasn't meant to be edited. — Valuator
– Valuator, Commented May 2, 2018 at 15:00

Valuator · Accepted Answer · 2018-05-02 16:11:10Z

1

One solution I've done is to create a Powershell script that will modify your web.config file however you need and execute it as a Pre-publish Target.

Keep the script in your project directory and update the .csproj file so that it will run just before publishing the project:

Left click project name in Visual Studio -> "Edit .csproj" and insert this somewhere inside the <Project> tags:

<Target Name="PrepublishScript" BeforeTargets="PrepareForPublish" Condition=" '$(IsCrossTargetingBuild)' != 'true' ">
    <Exec Command="powershell.exe -NonInteractive -File Prepublish.ps1" />
</Target>

Edit: My task was simpler, I just needed to remove the LAUNCHER_ARGS added to the <aspNetCore> element, so I just did a simple string replace with an empty string,

Prepublish.ps1:

(Get-Content web.config).Replace(" arguments=`"%LAUNCHER_ARGS%`"", "") | Set-Content web.config

edited May 2, 2018 at 16:11

answered May 2, 2018 at 15:03

Valuator

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3 Comments

Matthew Flynn Over a year ago

Out of interest how do you edit the file to add it in the correct location?

Matthew Flynn Over a year ago

Sorry I meant do you have an example of your powershell script?

Valuator Over a year ago

I added mine, but my modification wasn't quite as involved as yours so a slightly different approach might be needed.

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