Background Service to early up and running

[hannespreishuber]

following code fails with NullReferenceException

 protected override Task ExecuteAsync(CancellationToken stoppingToken)
        {
            var path = Path.Combine(AppDomain.CurrentDomain.GetData("WWWBaseDirectory").ToString(),
                "wwwroot\\videos"); ;

the reason is (my guess) the pipeline is not configured

   public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            AppDomain.CurrentDomain.SetData("WWWBaseDirectory", env.ContentRootPath);

Cause

     services.AddHostedService<VideosWatcher>();

runs earlier

[davidfowl]

@hannespreishuber Can you provide the actual error and call stack?

[davidfowl]

Yes this was an intentional breaking change that was made #11437.

A couple of things you can do:

• Inject the IHostEnvironment or IWebHostEnvironment into the VideosWatcher.
• Add the hosted service in Program.cs after calling ConfigureWebHostDefaults

cc @Tratcher @anurse

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