how to get values from appsettings.json

Hi Ritu,

You need to inject IConfiguration interface in which ever place you need to use. After that you can get values from appsetting.json file,

Please refer this link which will help you out,

https://www.c-sharpcorner.com/article/reading-values-from-appsettings-json-in-asp-net-core/

https://www.c-sharpcorner.com/article/appsettings-6-ways-to-read-the-config-in-asp-net-core-3-0/

You can simply inject IConfiguration inside the constructor of the particular class and use that object to get environment variables value form appsettings.json

thanks for ur solution
but when i'm using this approach to my code like below:

public class TeemController : ControllerBase
{
public readonly IConfiguration _iconfiguration;
 public TeemController(IConfiguration iconfiguration)
        {
            _iconfiguration = iconfiguration;
        }

[HttpGet("getTime")]

public ActionResult getTime(string r, string p, string e)
        {
            string p = _iconfiguration.GetValue("DevSetting:pr");

           PContract pCon = getP() ;
        //.....
      }
} // it shows p value successfully.

-----------------------------------------------------------------------

But when i'm using this approach to another class 
it throws error null reference

public class MyHelper
{
public static IConfiguration _iconfiguration;
        public MyHelper(IConfiguration iconfiguration)
        {
            _iconfiguration = iconfiguration;
        }
private static List getP() 
        {
            string p = _iconfiguration.GetSection("DevSetting").GetSection("pr").Value;
            string p = _iconfiguration.GetValue("DevSetting:pr");

        //......
}

You can do in controller or class.

First inject IConfiguration in Ctor as shown:

 private readonly IConfiguration _iconfiguration;  
public HomeController(IConfiguration iconfiguration) {  
            _iconfiguration = iconfiguration;  
 }  

Then use configuration as in any Action as shown:

 public IActionResult Index() {  
            // First way  
            string value1 = _iconfiguration.GetSection("Data").GetSection("ConnectionString").Value;  
            // Second way  
            string value2 = _iconfiguration.GetValue < string > ("Data:ConnectionString");  
            var EmailID = _iconfiguration["EmailID"];  
            var Websitename = _iconfiguration["Websitename"];  
            var WebsiteURL = _iconfiguration["WebsiteURL"];  
            return View();  
}  

You can do the same way in class. However, if it better to use interface and implementation. 

https://www.c-sharpcorner.com/article/appsettings-6-ways-to-read-the-config-in-asp-net-core-3-0/

public class DemoController : ControllerBase
{
    private readonly IConfiguration _configuration;

    public DemoController(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    [HttpGet]
    public bool GetIsLaunchBrower()
    {
        var brower = _configuration.GetValue("IIS Express:launchBrowser");
        return brower;
    }
}

var envrionment = _configuration.GetValue("IIS Express:environmentVariables:ASPNETCORE_ENVIRONMENT");

Refer links

https://www.c-sharpcorner.com/article/reading-values-from-appsettings-json-in-asp-net-core/