c# - Best way to handle null properties on a method parameter -

when checking method's parameter, throw argumentnullexception if it's null. see first line in method below. properties on parameter shouldn't null? if try handle them same way, code analysis error:

ca2208 instantiate argument exceptions correctly method 'priorityderatingcomponentlogic.createitem(ivsimulation)' passes 'ivsimulation.solarpanel' 'paramname' argument 'argumentnullexception' constructor. replace argument 1 of method's parameter names. note provided parameter name should have exact casing declared on method.

public deratingcomponentbase createitem(ivsimulation ivsimulation) {     if (ivsimulation == null) { throw new argumentnullexception("ivsimulation"); }     if (ivsimulation.solarpanel == null) { throw new argumentnullexception("ivsimulation.solarpanel"); }     if (ivsimulation.globalequipment == null) { throw new argumentnullexception("ivsimulation.globalequipment"); }      // ... method body here } 

is ca error should suppress, or there generally-accepted way better handle this? perhaps issue upstream , shouldn't have check properties being null @ point?

throwing argumentnullexception intended indicate argument null. however, when 1 of argument components null, argument isn't, proper exception argumentexception name of argument parameter:

if (ivsimulation.globalequipment == null) {     throw new argumentexception("globalequipment cannot null", "ivsimulation");  } 

this provides information error in message, while specifying ivsimulation parameter name.

note: assume have no choice of validating globalequipment in constructor of ivsimulation, because throwing argumentnullexception valid choice in constructor.