ASP.NET Core - Connection String Configuration

ConfigurationExtensions.cs

public static class ConfigurationExtensions
{
    public static string GetConnectionStringOrThrow(this IConfiguration configuration, string name)
    {
        var connectionString = configuration.GetConnectionString(name);
        if (string.IsNullOrWhiteSpace(connectionString))
        {
            throw new InvalidOperationException($"Connection string '{name}' not found.");
        }

        return connectionString;
    }
}