How to get string array from core console appSettings.json file

Question

How do I return an string[] from the IConfigurationRoot object?

File exists and is set to copy to output

Code

var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("settings.json", optional: false, reloadOnChange: false);
_configuration = builder.Build();

var arr = _configuration["stringArray"]; // this returns null
var arr1 = _configuration["stringArray:0"]; // this works and returns first element

Settings.json

{
  "stringArray": [
    "myString1",
    "myString2",
    "myString3"
  ]
}

Nkosi · Accepted Answer · 2019-12-31 11:32:44Z

10

Use the GetValue<TResult> extension to get the value of the section.

// Requires NuGet package "Microsoft.Extensions.Configuration.Binder"
var array = _configuration.GetValue<string[]>("stringArray");

Or try binding to the section

var values = new List<string>();
_configuration.Bind("stringArray", values);

Alternatively ConfigurationBinder.Get<T> syntax can also be used, which results in more compact code:

List<string values = _configuration.GetSection("stringArray").Get<string[]>();

Reference Configuration in ASP.NET Core: Bind to an object graph

edited Dec 31, 2019 at 11:32

answered Jun 6, 2018 at 18:55

Nkosi

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2 Comments

user3953989 Over a year ago

Thanks! The 2nd method works. Also, just to comment here, it's disheartening to need 3 external nuget packages just to read text from a file, then another one just to get the info from it. Seems like this is way over-complicated.

Josef Bláha Over a year ago

The 1st method seems intuitive, but returns null for me. The 3rd one works.

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