[Solved] Environment.GetEnvironmentVariable return null in ASP.Net Core

Environment.GetEnvironmentVariable return null in asp.net core.

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "Values": {
    "EnvironmentName": "Testing"
  }
}

var test= System.Environment.GetEnvironmentVariable("EnvironmentName");