Get values from appsettings.json in .net core 3.1

Question

What I'm trying to do should be simple but I can not get it to work!!

My appsettings.json file:

{
  "AppSettings": {
    "myKey": "myValue",
  }
}

And then:

var config = new ConfigurationBuilder().AddJsonFile("appsettings.json").Build();
var myValue = config["myKey"];

myValue is null.

I also tried:

var builder = new ConfigurationBuilder()
    .SetBasePath(Directory.GetCurrentDirectory())
    .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
    .AddEnvironmentVariables();
IConfiguration config = builder.Build();

var myValue = config.GetSection("myKey");

But again, myValue is null.

In your code sample do you mean config["myKey"] or are you doing config["myValue"]? — Steve
– Steve, Commented Feb 27, 2020 at 18:56
@knittl Typo! Trust me, it's correct in the actual code. See edited OP. — Casey Crookston
– Casey Crookston, Commented Feb 27, 2020 at 18:57

Gabriel Cappelli · Accepted Answer · 2020-02-27 19:05:35Z

7

In your appsettings.json myKey is inside an AppSettings object.

That whole object is being loaded, so you'll need to reference it:

var myValue = config["AppSettings:myKey"];

Reference: https://learn.microsoft.com/en-us/aspnet/core/fundamentals/configuration/?view=aspnetcore-3.1#hierarchical-configuration-data

answered Feb 27, 2020 at 19:05

Gabriel Cappelli

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5 Comments

Casey Crookston Over a year ago

Nailed it! Thank you!! Wow... spent hours on this. Much appreciated. Followup question: of the two examples/attempts I have above, which is better, and why?

Gabriel Cappelli Over a year ago

I wouldn't use SetBasePath and AddEnvironmentVariables unless they're really necessary, keeping it simple.

Gabriel Cappelli Over a year ago

using optional: false sounds like a good idea, you wouldn't want your tests to run without the proper config values, since they'll probably fail anyway.

Casey Crookston Over a year ago

could I also draw your attention to this quesion? :) stackoverflow.com/questions/60441040/…

variable Over a year ago

Suppose in the dev json file I created key called key1 and in prod json file I create key called key2, then when I run the project in visual studio, it is reading both the keys. Shouldn't it read only the key from the dev json file?

Shunya · Accepted Answer · 2022-01-06 16:17:21Z

0

You have to write var myValue = config["AppSettings:myKey"]; instead of var myValue = config.GetSection("myKey");, Because myKey is inside of AppSettings:myKey.

edited Jan 6, 2022 at 16:17

Shunya

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answered Jan 4, 2022 at 8:25

Vimal Maradiya

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1 Comment

Community Over a year ago

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