ASP.NET Core Configuration & Environments 3

Question 1

What does services.Configure<T>() do in the DI container?

Accepted Answer

Binds a configuration section to an options class and registers it

Answer

services.Configure() reads a configuration section and registers it so it can be injected via IOptions, IOptionsSnapshot, or IOptionsMonitor.

Question 2

How do you perform options validation in ASP.NET Core?

Accepted Answer

Use services.AddOptions().ValidateDataAnnotations() or implement IValidateOptions

Answer

ValidateDataAnnotations() checks data annotation attributes at runtime, while IValidateOptions<T> allows custom validation logic.

Question 3

What is the purpose of the ConfigureAppConfiguration method in the host builder?

Accepted Answer

Adds or customizes configuration sources for the application

Answer

ConfigureAppConfiguration allows adding or modifying configuration providers such as JSON files, environment variables, or custom sources.

Question 4

Which configuration provider is used to read from Azure Key Vault?

Accepted Answer

Azure.Extensions.AspNetCore.Configuration.Secrets

Answer

The Azure.Extensions.AspNetCore.Configuration.Secrets NuGet package provides the AzureKeyVaultConfigurationProvider for reading secrets from Azure Key Vault.

Question 5

What is PostConfigure used for in the Options pattern?

Accepted Answer

Applying configuration changes after all Configure calls have run

Answer

PostConfigure<T>() registers a callback that runs after all Configure callbacks, allowing final overrides or modifications to options.

ASP.NET Core Practice Test

ASP.NET Core Practice Test

ASP.NET Core Configuration & Environments 3