CODEWITHSUNDEEP
c#asp.net-corekestrel-http-server
Nicolas Boisvert
Nicolas Boisvert

Reputation: 1171

asp.net core 2 web api set hosting url from appsettings

On an asp.net core 2 web api, I want to be able to set the url on which my api will listen (api run as windows service) based on a value in appsettings.json file. I can't find a way to achive it, how can I have acces to an instance of IConfiguration ?

var pathToExe = Process.GetCurrentProcess().MainModule.FileName;
var pathToContentRoot = Path.GetDirectoryName(pathToExe);

return WebHost.CreateDefaultBuilder(args)
    .UseContentRoot(pathToContentRoot)
    .UseStartup<Startup>()
    .UseUrls({value_from_appsettings})
    .Build()
    .RunAsService();

Upvotes: 1

Views: 3265

Answers (1)

Kirk Larkin
Kirk Larkin

Reputation: 93053

In order to gain access to the configuration before you go down the WebHost.CreateDefaultBuilder path, you'll need to build your own IConfiguration instance using ConfigurationBuilder.

Taking the example from your question, you can use something like the following:

var pathToExe = Process.GetCurrentProcess().MainModule.FileName;
var pathToContentRoot = Path.GetDirectoryName(pathToExe);

var appSettingsConfiguration = new ConfigurationBuilder()
    .SetBasePath(pathToContentRoot)
    .AddJsonFile("appsettings.json")
    .Build();

return WebHost.CreateDefaultBuilder(args)
    .UseContentRoot(pathToContentRoot)
    .UseStartup<Startup>()
    .UseUrls(appSettingsConfiguration["Your:Value"])
    .Build()
    .RunAsService();

This is somewhat explained in the docs where the example uses instead a hosting.json file to set this up. It also makes use of UseConfiguration, which allows you to specify a value for e.g. urls, which will be picked up automatically.

Upvotes: 2

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