How to create unique contacts in Salesforce depending on the value of number of location field in account object?

I have created a trigger on account object and want to insert or update number of contacts depending on the value of number of location field in Account Object.

While using List<Contacts> it's working and gives list of contacts with same name.

But i want to use Set<Contact> to get unique contacts????

#trigger

trigger numberOfLocations on Account (after insert, After Update) {

Set<contact> listContact = new Set<contact>();//When I replace Set<Contact> With List<Contact> it's working and gives the list of contacts which is not unique.
map<id,decimal> mapAcc=new map<id,decimal>();
for(Account acc:trigger.new){
mapAcc.put(acc.id,acc.NumberofLocations__c);
}
if(mapAcc.size()>0 && mapAcc!=null){
for(Id accId:mapAcc.keyset()){
for(integer i=0;i<mapAcc.get(accId);i++){
contact newContact=new contact(AccountId=accId,LastName='MyContact');// I don't want to use 'MyContact'+i bcz i want to check the functionality of Set<Contact>
listContact.add(newContact);
}
}
}
if(listContact.size()>0 && listContact!=null)
upsert listContact;
}

#error

DML requires SObject or SObject list type: Set<Contact>

• This discussion was modified 7 years, 8 months ago by  Shaharyar.
• This discussion was modified 7 years, 8 months ago by  Forcetalks.
• This discussion was modified 7 years, 8 months ago by  Forcetalks.