CODEWITHSUNDEEP
asp.net-core
dumbledad
dumbledad

Reputation: 17527

ASP.Net Core RC2 cannot find config.json

I'm updating my ASP.Net Core project from RC1 to the recently released RC2. One problem I am facing is loading the config.json file into the configuration object in Startup.cs.

My project fails to start and throws the System.IO.FileNotFound exception when it fails to find config.json.

Here's the working code from RC1

public Startup(IHostingEnvironment env, IApplicationEnvironment appEnv)
{
    Configuration = new ConfigurationBuilder()       
        .AddJsonFile("Settings/config.json")
        .AddEnvironmentVariables()
        .Build();
}

Here's the almost identical code in RC2, which does not work. Note that I've moved the config.json file up a level just-in-case it was folder hierarchies that were causing the failure.

public Startup(IHostingEnvironment env)
{
    Configuration = new ConfigurationBuilder()
        .SetBasePath(env.ContentRootPath)
        .AddJsonFile("config.json")
        .AddEnvironmentVariables()
        .Build();
}

(N.B. I've tried with and without the SetBasePath call.)

One option is to replace .AddJsonFile("config.json") with these two lines

.AddJsonFile("config.json", optional: true, reloadOnChange: true)
.AddJsonFile($"config.{env.EnvironmentName}.json", optional: true)

That does prevent the System.IO.FileNotFound exception but only by making the file load optional, it still seems to fail to load.

To debug what is happening I've added a FileInfo("config.json") and the file exists. I've tried using the full name from that FileInfo object and I still get the exception.

How do I load the config.json in RC2, or how do I diagnose its failure to load?

Upvotes: 0

Views: 363

Answers (1)

Set
Set

Reputation: 49769

You should add WebHostBuilderExtensions.UseContentRoot method call before building IWebHost instance.

Example: 

    public static void Main(string[] args)
    {
        var host = new WebHostBuilder()
            .UseKestrel()
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseStartup<Startup>()
            .Build();

        host.Run();
    }

Upvotes: 3

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