Environment Variables

2018-04-30

At the root of an application is a metadata file that describes the global configuration of the host serving the different functions.

Accessing environment variables

You may need to store custom settings for your Azure function. One available option is to use environment variables. You can manage these settings in the Application settings section of your function app in the Azure portal.

[FunctionName("CustomSettings")]
public static Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "GET")]HttpRequestMessage req, TraceWriter log)
{
    log.Info("101 Azure Function Demo - Accessing Environment variables");
    var customSetting =  Environment.GetEnvironmentVariable("CustomSetting", EnvironmentVariableTarget.Process);
    return Task.FromResult(req.CreateResponse(HttpStatusCode.OK, new { setting= customSetting }));
}

[<FunctionName("CustomSettings")>]
let Run([<HttpTrigger(AuthorizationLevel.Anonymous, "GET")>] req: HttpRequestMessage, log: TraceWriter) =
    log.Info "101 Azure Function Demo - Accessing Environment variables"
    let customSetting = Environment.GetEnvironmentVariable("CustomSetting", EnvironmentVariableTarget.Process)
    req.CreateResponse(HttpStatusCode.OK, sprintf "My setting is %s" customSetting)

Takeaways

Environment variables are configured in the Application Settings section
Use the static GetEnvironmentVariable method of the Environment type access them