private void AddInMemorySettings(EnvironmentConfig config) { var builder = new ConfigurationBuilder(); var dict = new Dictionary <string, string> { { "App:MainWindow:Height", "20" }, { "App:MainWindow:Width", "50" }, { "App:MainWindows:ValidatedValue", "3" }, { "App:MainWindow:Dialog:Colors:Frame", "RED" }, { "App:MainWindow:Dialog:Colors:Title", "DARK_RED" } }; builder.AddInMemoryCollection(dict); config.UseConfiguration(builder.Build()); }