ConfigurationBuilder is built in .net core thinger ConfigurationBuilder from Microsoft.Extensions.Configuration package (or the metapackage if you're using asp.net core.)
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Woah, how did I not know about the ConfigurationBuilder class?
Are you using the one that comes with ASP, or is that an AutoFac thing?
yar!
ConfigurationBuilderis built in .net core thinger ConfigurationBuilder fromMicrosoft.Extensions.Configurationpackage (or the metapackage if you're using asp.net core.)