ASP.NET Core 6 how to access Configuration during startup

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WebApplicationBuilder returned by WebApplication.CreateBuilder(args) exposes Configuration and Environment properties:

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
...
ConfigurationManager configuration = builder.Configuration; // allows both to access and to set up the config
IWebHostEnvironment environment = builder.Environment;

WebApplication returned by WebApplicationBuilder.Build() also exposes Configuration and Environment:

var app = builder.Build();
IConfiguration configuration = app.Configuration;
IWebHostEnvironment environment = app.Environment;

Also check the migration guide and code samples.

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