<PackageReference Include="System.Configuration.ConfigurationManager" Version="4.4.0-preview2-25405-01" />

SettingsPropertyNotFoundException

using System.Runtime.Serialization; namespace System.Configuration { public class SettingsPropertyNotFoundException : Exception { public SettingsPropertyNotFoundException(string message) : base(message) { } public SettingsPropertyNotFoundException(string message, Exception innerException) : base(message, innerException) { } protected SettingsPropertyNotFoundException(SerializationInfo info, StreamingContext context) : base(info, context) { throw new PlatformNotSupportedException(); } public SettingsPropertyNotFoundException() { } } }