How Configuration works in ASP.NET Core?

In ASP.NET Core, Configuration is implemented using various configuration providers. Configuration data is present in the form of key value pairs that can be read by configuration providers as key value from different configuration sources as below.
  • appsettings.json - settings file
  • Azure Key Vault
  • Environment variables
  • In-memory .Net objects
  • Command Line Arguments
  • Custom Providers
By default apps are configured to read the configuration data from appsettings.json, environment variables, command line arguments etc. While reading the data, values from environment variables override appsettings.json data values. 'CreateDefaultBuilder' method provide default configuration.

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