Method for the. net core static class to get appsettings

Injection acquisition

Injection access through IConfiguration direct access to the method in the official document, you can directly see here

For example: appsettings. json

{
  "Position": {
    "Title": " Editor ",
    "Name": "Joe Smith"
  },
  "MyKey": "My appsettings.json Value",
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}

You can take the value in the form of colon separation with injected IConfiguration, as follows

 var name = Configuration["Position:Name"];

Entity class acquisition

It is not convenient to obtain the values corresponding to multiple combinations individually. For example, Logging should be received directly with one class as follows:
First define a class corresponding to the json node

 public class Logging
  {
    public LogLevel LogLevel { get; set; }
  }
  public class LogLevel
  {
    public string Default { get; set; }
    public string Microsoft { get; set; }
    public string Lifetime { get; set; }
  }

Then ConfigureServices increases in Startup

services.Configure<Logging>(Configuration.GetSection("Logging"));

Inject directly into the place called

 private readonly Logging _config;
 public HomeController(IOptions<Logging> config)
 {
   _config = config.Value;
 }

Static class acquisition

If it is used in a static class, you can write this in the constructor in Startup

public Startup(IConfiguration configuration)
    {
      Configuration = configuration;
      configuration.GetSection("Logging").Bind(MySettings.Setting);
    }

Bind the node directly to an instance using the Bind method of IConfigurationSection, noting that the example must be initialized.

public static class MySettings
  {
    public static Logging Setting { get; set; } = new Logging();
  }

With the properties of static classes, they can be used in static classes.