The Microsoft.Extensions.Configuration package provides a ConfigurationBuilder class which can be used to create a configuration object that reads data from various sources such as appsettings.json, environment variables, command-line arguments, etc. One of the useful features of ConfigurationBuilder is the ability to store sensitive data such as connection strings, passwords, etc. in a safe and secure manner using the AddUserSecrets method.
The AddUserSecrets method is used to enable reading of user secrets during development. This method loads secrets from a user-specific location and merges them into the configuration. The user secrets are typically stored in a file on the developer's computer and are not checked into source control. This ensures that sensitive information is not visible to other developers or stored in the source code repository.
Here is an example of how to use the AddUserSecrets method in C#:
`using Microsoft.Extensions.Configuration; using Microsoft.Extensions.Configuration.UserSecrets;
var builder = new ConfigurationBuilder() .AddUserSecrets() .Build();`
In this example, the AddUserSecrets method is applied to the ConfigurationBuilder instance, specifying the type of the class that is loading the secrets (in this case, the Program class). The Build method is then called to create the configuration object.
The package library for this functionality is Microsoft.Extensions.Configuration.UserSecrets. This package is part of the Microsoft.Extensions.Configuration family of packages and is available via NuGet.
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