C#•7h ago

Appsettings not mapping to Options class

I could probably have worded the question better, but please bear with me. Also, this is not my code, and probably has not been set up properly, but other team members are all really busy. I see this in the Program class:

        public static IWebHost CreateWebHostBuilder(string[] args)
        {
            var config = new ConfigurationBuilder().AddCommandLine(args).Build();
             return WebHost.CreateDefaultBuilder(args)
...
                     .UseConfiguration(config)
                     .Build()
                     .InitializeIdentityDb<ApplicationUser, ApplicationRole>();
        }

        public static IWebHost CreateWebHostBuilder(string[] args)
        {
            var config = new ConfigurationBuilder().AddCommandLine(args).Build();
             return WebHost.CreateDefaultBuilder(args)
...
                     .UseConfiguration(config)
                     .Build()
                     .InitializeIdentityDb<ApplicationUser, ApplicationRole>();
        }

and then

` is defined as such:
```cs
        public static IWebHost InitializeIdentityDb<TUser, TRole>(this IWebHost host)
        {
            using (var scope = host.Services.CreateScope())
            {
                var services = scope.ServiceProvider;
                var options = services.GetRequiredService<IOptions<CassandraOptions>>();
...
                var initializer = new DbInitializer(session);
                initializer.Initialize<TUser, TRole>(options.Value);

                return host;
            }
        }
```
Then

CassandraOptions

 is declared as:
```cs
    public class CassandraOptions
    {
        public List<string> ContactPoints { get; set; }
        public CassandraCredentials Credentials { get; set; }
        public string KeyspaceName { get; set; }
        public Dictionary<string, string> Replication { get; set; } = null;
        public bool DurableWrites { get; set; } = true;
        public CassandraQueryOptions Query { get; set; }
    }
```
Now at my breakpoint on

initializer.Initialize<TUser, TRole>(options.Value), I see that options

 is not populated. Colleagues reckon it's supposed to be populated from command line arguments, but how do I define nested values like

CassandraOptions` with command line params?

8 Replies

Unknown User•7h ago

Message Not Public

Thalnos•7h ago

unrelated to the problem but also odd that CreateWebHostBuilder returns IWebHost rather than IWebHostBuilder. Either change the method's name or don't build inside the method

Unknown User•7h ago

Message Not Public

Yawnder•6h ago

Where is CassandraOptions registered? I'd expect to see something like builder.Services.Configure<CassandraOptions>(builder.Configuration.GetSection("Cassandra"));

Unknown User•6h ago

Message Not Public

Yawnder•6h ago

You don't need the bind afaik.

Unknown User•6h ago

Message Not Public

VoidPointerOP•4h ago

Sorry guys, the use of options in this project was royally screwed up be whoever tried it, so they reverted to manually reading env vars for cassandra, and mine weren't getting read. I'll close this now as a bad joke.

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Appsettings not mapping to Options class

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