<PackageReference Include="NETStandard.Library" Version="2.0.0" />
System.NullReferenceException
namespace System
{
public class NullReferenceException :
SystemException
{
public NullReferenceException();
protected NullReferenceException(
SerializationInfo info,
StreamingContext context);
public NullReferenceException(
string message);
public NullReferenceException(
string message,
Exception innerException);
}
}