Configuration is the cornerstone of any application, providing essential settings and values that drive its behavior. ASP.NET Core’s configuration system is flexible and extensible, allowing you to retrieve configuration data from various sources and prioritize them according to your needs.
Core Concepts Configuration Providers: These components read configuration data from different sources and populate a central configuration store. Configuration Sources: The actual locations or mechanisms where your configuration data resides (e.g., files, environment variables, command-line arguments). Key-Value Pairs: Configuration data is stored as key-value pairs, where the key is a string identifier, and the value is the configuration data (string, number, boolean, etc.).
Common Configuration Sources Files (JSON, XML, INI): Purpose: Storing configuration data in structured files. JSON is the default and most common format in ASP.NET Core.
Environment Variables: Purpose: Reading configuration values from environment variables.
Command-Line Arguments: Purpose: Overriding configuration values when running the application from the command line.
In-Memory .NET Objects: Purpose: Storing configuration data in a dictionary or custom objects directly in your code.
Azure Key Vault: Purpose: Securely storing secrets and sensitive configuration data in the cloud.
Azure App Configuration: Purpose: A powerful cloud-based service for managing feature flags and configuration settings.
User Secrets (Development): Purpose: Storing sensitive data (e.g., API keys) during development without committing them to source control.
Adding and Managing Configuration Sources in Program.cs var builder = WebApplication.CreateBuilder(args); var configuration = builder.Configuration;
// Add configuration sources in the desired order of precedence (last added wins) configuration.AddJsonFile(“appsettings.json”, optional: false, reloadOnChange: true); configuration.AddJsonFile($”appsettings.{env.EnvironmentName}.json”, optional: true, reloadOnChange: true); configuration.AddEnvironmentVariables(); configuration.AddUserSecrets<Program>(); // For development secrets // … other sources … AddJsonFile: Loads configuration from JSON files. AddEnvironmentVariables: Loads configuration from environment variables. AddUserSecrets<Program>(): Loads configuration from the user secrets store (for development).
By
No Comments
Dependency Injection in ASP.NET Core