ASP.NET Core Configuration & Logging 3

Question 1

What is IOptionsSnapshot<T> used for in ASP.NET Core?

Accepted Answer

To get a scoped options value that reflects configuration changes between requests

Answer

To take a snapshot of all configuration at startup

Answer

To cache options values permanently

Answer

To validate options on first access

Question 2

Which method adds Serilog as the host logging provider in the minimal hosting model?

Accepted Answer

builder.Host.UseSerilog()

Answer

services.AddSerilog()

Answer

app.UseSerilog()

Answer

builder.Logging.AddSerilog()

Question 3

What does the ASPNETCORE_ENVIRONMENT environment variable control?

Accepted Answer

The active environment name, affecting which appsettings and middleware are loaded

Answer

The base URL of the application

Answer

The port the Kestrel server listens on

Answer

The log output destination

Question 4

What is the purpose of IConfiguration.GetConnectionString("name") in ASP.NET Core?

Accepted Answer

It retrieves the connection string from the ConnectionStrings section by name

Answer

It creates a database connection

Answer

It validates the connection string format

Answer

It reads connection strings from environment variables only

Question 5

Which method validates options at startup and throws if the configuration is invalid?

Accepted Answer

services.AddOptions<T>().ValidateDataAnnotations().ValidateOnStart()

Answer

services.Configure<T>().Validate()

Answer

IOptions.Validate()

Answer

services.ValidateOptions<T>()

Question 6

What is a logging scope in ASP.NET Core?

Accepted Answer

A context block that adds additional structured data to all log messages within it

Answer

A restricted area where logging is disabled

Answer

A named logger instance for a specific class

Answer

A log level filter applied to a namespace