Get Azure AppSettings in a Controller

Question

I have an ASP.NET Core 2 application hosted on Azure, and I added a new Application Settings MyNewSetting for my App in the Azure Portal.

How do I access that setting from a controller?

My code bellow:

public void ConfigureServices(IServiceCollection services)
{
    services.AddOptions();

    services.Configure<AppSecrets>(Configuration);
    services.AddSingleton<ITableRepositories, TableClientOperationsService>();
    //...

My Controller:

public class RecordController : Controller
{
    const int MyNewSetting = 7; // this one to replace with Azure Setting one
    private readonly ITableRepositories repository;

    public RecordController(ITableRepositories rep) {
        repository = rep;
    }

Here, I need probably to add FromServices injection, but I am not sure if it will work...

EDIT:

Folowing the @dee_zg answer, the following code could probably do the job:

public class RecordController : Controller
{
    int MyNewSetting = 7;
    private readonly ITableRepositories repository;

    public RecordController(ITableRepositories rep) {
        repository = rep;
        int myInt;
        if (int.TryParse(System.Environment.GetEnvironmentVariable("MY_NEW_SETTING"), 
                         out myInt)) {
            MyNewSetting = myInt;
        };
    }

tlt · Accepted Answer · 2017-10-31 10:26:19Z

2

You can choose to either get them from AppSettings["your-key"] collection or as environment variables: Environment.GetEnvironmentVariable("your-key").

From there you can map them to your custom IOptions and inject wherever you need them.

answered Oct 31, 2017 at 10:26

tlt

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Community · Accepted Answer · 2020-06-20 09:12:55Z

0

There's quite a few things you can do.

Use Options and configuration objects

The options pattern uses custom options classes to represent a group of related settings. We recommended that you create decoupled classes for each feature within your app.
Use an IOptionsSnapshot.

IOptionsSnapshot supports reloading configuration data when the configuration file has changed. It has minimal overhead. Using IOptionsSnapshot with reloadOnChange: true, the options are bound to Configuration and reloaded when changed.
... (see documentation)

In short, have a look at Configuration in ASP.NET Core, determine the scenario that best fits your needs and have at it!

Hope this helps.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Oct 31, 2017 at 10:39

rickvdbosch

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2 Comments

serge Over a year ago

I already saw that documentation before asking the question. Say, I know what to use, I don't know HOW to use, this is why I added some code.

serge Over a year ago

Thanks. I wouldn't ask if the code in example were useful for my case.

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