How do I get values from a json configuration file on c# using ConfigurationBuilder?

Question

I'm trying to get a path url from the following notificatorConfig.json file:

{
  "UserNotificatorConfig": {
    "URL": "http://localhost:8001",
    "BasePath": "/send-message/android"
  }
}

Using a ConfigurationBuilder() as follows:

public async Task Send(string message)
{
    var config = new ConfigurationBuilder()
                           .AddJsonFile("notificatorConfig.json", true)
                           .Build();

    var url = config.GetSection("UserNotificatorConfig:URL").Value;
    var basePath = config.GetSection("UserNotificatorConfig:BasePath").Value;

    await _rest.PostAsync<Notification>(url, basePath, message);
}

Both my json file and the file where my Send() method is located, are in the same folder.

But every time I try to debug this method on unit tests I get null values for both parameters url and basePath.

What am I missing here?

Your code looks a bit off to me. Building the configuration is something that's done in startup. Why are you trying to build it in some method during runtime? — Dennis VW
– Dennis VW, Commented May 22, 2020 at 23:59

Marko Radivojević · Accepted Answer · 2020-05-23 01:40:43Z

1

You need to add SetBasePath(Directory.GetCurrentDirectory()):

var config = new ConfigurationBuilder()
    .SetBasePath(Directory.GetCurrentDirectory())
    .AddJsonFile("notificatorConfig.json", true)
    .Build();

And, as @Dennis1679 said, you should build configuration in startup.

Edit:

If this doesn't help, access Value inside Section this way:

var userNotificatorConfig = config.GetSection("UserNotificatorConfig");
var url = userNotificatorConfig.GetValue<string>("URL");
var basePath = userNotificatorConfig.GetValue<string>("BasePath");

Instead of this way:

var url = config.GetSection("UserNotificatorConfig:URL").Value;
var basePath = config.GetSection("UserNotificatorConfig:BasePath").Value;

edited May 23, 2020 at 1:40

answered May 23, 2020 at 0:01

Marko Radivojević

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4 Comments

Rogerio Schmitt Over a year ago

No game, when I do this GetCurrentDirectory() returns my tests directory and not the one where my json is located.

Rogerio Schmitt Over a year ago

According to this: stackoverflow.com/questions/39791634/…. There is a specific issue about using GetCurrentDirectory() on a test project, it is recommended that I keep a copy of my json file in the test project. I see a big issue here as I would have to assure equality in two different json files.

Marko Radivojević Over a year ago

@RogerioSchmitt This might help you: stackoverflow.com/questions/674857/…. I see a big issue here as I would have to assure equality in two different json files. I agree with you, however, it is a valid everyday solution.

Marko Radivojević Over a year ago

@RogerioSchmitt I've added another way of accessing Values in UserNotificatorConfig section, if previous solution doesn't help.

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