This is designed to offer functionality that replaces placeholders in configuration files with environment variables.
Placeholders follow the format ${The_Variable}. The solution supports reloadOnChange except environment variables.
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
})
.ConfigureAppConfiguration((hostBuilderContext, configBuilder) =>
{
// clear original sources
configBuilder.Sources.Clear();
// add json file supports placeholder
configBuilder.AddPlaceholderJsonFile("appsettings.json", optional: false, reloadOnChange: true);
// add environment variables
configBuilder.AddEnvironmentVariables();
})
;
}{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*",
"ServerInfo": {
"Data": "Name = ${SERVER_NAME}, IP = ${SERVER_IP}, NotFound = ${NOT_FOUND}, Name = ${SERVER_NAME}"
}
}SERVER_NAME=Ron's Server
SERVER_IP=1.1.1.1
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