Configuration Execution Order in ASP.NET Core App
The default orders in which the various configuration sources are read for the same key are as follows:
1. appsettings.json
2. appsettings.{Environment}.json here we use appsettings.Development.json
3. User secrets
4. Environment Variables
Add a Key in appsettings.Development.json file
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft.AspNetCore": "Warning"
}
},
"MyCustomKey": "MyCustomKey Value coming from appsettings.Development.json"
}
Register in Program.cs file to show value of this custom key
public class Program
{
public static void Main(string[] args)
{
var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();
ConfigurationManager configuration = builder.Configuration;
string MyCustomKeyValue = configuration.GetValue<string>("MyCustomKey");
app.MapGet("/", () => $"{MyCustomKeyValue}");
app.UseStaticFiles();
app.UseRouting();
app.Run();
}
}
}
Run your application
Now add the same key as “MyCustomKey”: “MyCustomKey Value coming from Environment Variable of launchsSettings.json” in the IIS Express Profile Section of the launchSettings.json file
{
"profiles": {
"IIS Express": {
"commandName": "IISExpress",
"launchBrowser": true,
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
},
"ancmHostingModel": "OutOfProcess",
"MyCustomKey": "MyCustomKey Value coming from Environment Variable of launchSettings.json file"
}
},
}
Run your application
