ASP.NET Core allows you to create configuration files that are specific to different environments. By convention, these files are named appsettings.{Environment}.json, where {Environment} is replaced with the name of the environment (e.g., appsettings.Development.json, appsettings.Production.json).
Purpose: Environment-Specific Settings: These files store configuration values that are unique to each environment. This could include database connection strings, API keys, logging levels, or feature flags. Customization: You can tailor your application’s behavior for development, testing, staging, and production environments without having to manually modify configuration settings every time you deploy.
Order of Precedence: ASP.NET Core loads configuration from multiple sources, and the order in which they are loaded determines which values take precedence in case of conflicts. The general order of precedence (from highest to lowest) is: Command-Line Arguments: Any configuration values specified as command-line arguments when you run your application (e.g., dotnet run –Logging:LogLevel:Default=Debug) override all other sources. Environment Variables: Configuration values set as environment variables on your system take precedence over values in configuration files. ASP.NET Core automatically maps environment variables to configuration keys using a convention. For example, the environment variable ConnectionStrings__DefaultConnection would map to the configuration key ConnectionStrings:DefaultConnection. User Secrets (Development Only): If you’re in the Development environment, values from the user secrets store (secrets.json) override those from appsettings.json and appsettings.Development.json. This is useful for storing sensitive information during development. appsettings.{Environment}.json: If present, settings from this file override values from the base appsettings.json file. This allows you to customize settings for specific environments. appsettings.json: This is the base configuration file that is always loaded. It contains the default settings for your application.
// appsettings.Production.json { “ConnectionStrings”: { “DefaultConnection”: “Server=myprodserver;Database=MyDatabaseProd;User Id=myuser;Password=mypassword;” } } If the ASPNETCORE_ENVIRONMENT variable is set to “Production”, the connection string from appsettings.Production.json will be used.
Code Example: GetSection() and GetValue() var connectionString = _configuration.GetConnectionString(“DefaultConnection”);
var logLevel = _configuration.GetValue<string>(“Logging:LogLevel:Default”); GetConnectionString(“DefaultConnection”) is a convenience method to fetch a connection string specifically from the ConnectionStrings section. GetValue<string>() retrieves values from specific configuration sections or keys.
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