Overriding Configuration Values in config.json file in Azure Web App in ASP.Net 5

Question

I have a ASP.Net 5 application where i have some configuration values stored in config.json file. my config.json file is something like this.

{
  "AppSettings": {
    "SiteEmailAddress": "[email protected]",
    "APIKey": "some_api_key"
  }
}

I am setting up the config.json file to use in Startup.cs file like this.

public static IConfigurationRoot Configuration;

public Startup(IApplicationEnvironment appEnv) {

    var builder = new ConfigurationBuilder(appEnv.ApplicationBasePath)
                .AddJsonFile("config.json")
                .AddEnvironmentVariables();
    Configuration = builder.Build();
}

And accessing the config settings like this..

var email = Startup.Configuration["AppSettings:SiteEmailAddress"];

Earlier in ASP.Net we can use the Web.Config file to store these Application Settings and override them in App Settings in Azure App Settings section and that works with out any issues. But how can i do the same thing in ASP.Net 5 app.

How can i override the configuration values in config.json file in the App Settings section in Azure.

flytzen · Accepted Answer · 2015-11-22 16:38:44Z

22

Add them as App Settings in Azure, just like you are used to. For nested config values, use

AppSettings:SiteEmailAddress

Etc... (AppSettings here referring to what you used in your config.json, the similarity to Azure App Settings is coincidental)

AddEnvironmentVariables() like you have done is required for this to work.

answered Nov 22, 2015 at 16:38

flytzen

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1 Comment

silkfire Over a year ago

Also called appsettings.json in .NET Core.

Boris Lipschitz · Accepted Answer · 2016-01-15 11:48:13Z

2

Assuming you have appsettings.json, you could add another file appsettings.{Environment}.json, ie appsettings.Production.json. Only settings, defined in the production file would override settings in the appsettings.json. Now, add the following to the constructor of Startup

var builder = new ConfigurationBuilder()
    .AddJsonFile("appsettings.json")
    .AddJsonFile($"appsettings.{env.EnvironmentName}.json", true);

Next, you should go to launchSettings.json where all servers are defined and update environment variable to Production. For example,

"web": {
  "commandName": "web",
  "environmentVariables": {
    "Hosting:Environment": "Production"
  }

Now deploy to azure.

answered Jan 15, 2016 at 11:48

Boris Lipschitz

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4 Comments

Martin Over a year ago

Is there a way to not have to change the Hosting:Environment every time we deploy? Can we make this permanent?

Boris Lipschitz Over a year ago

you should define "profile" for each environment in launchSettings.json file. Each profile should have it's own "Hosting:Environment". ie for IIS Express => Development, for web => Production

Martin Over a year ago

I see. But how Azure know to pick the "web" profile? What if I'd like to have an "Azure Production" profile?

Boris Lipschitz Over a year ago

It's probably defined in the msbuild script in VS. You 'd need to lookup how to edit it.

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