entity framework - Code first mapping for self-related xref table -

i have read through several threads on stackoverflow , have not been able figure out. hoping can offer advice. have poco classes this:

person {   int personcode {get; set;}   ...   virtual list<personcontact> {get; set;} }  personcontact {   int personpersoncode {get; set;}   int contactpersoncode {get; set;}   int personcontacttypecode {get; set;}    virtual personcontacttype {get; set;}   virtual person person {get; set;}    // not sure need 1   virtual person contact {get; set;} } 

each person record have 0 many personcontact records. each personcontact record links 1 person record 1 other person record , indicates type of relationship between 2 person records personcontacttypecode.

i need able map person record can navigated related personcontact records. this:

var john = new person(...); var david = new person(...); john.personcontacts.add(new personcontact   {     contact = david,     personcontacttype = ... // manager   }); 

and then

john.personcontacts   .where(c => c.personcontacttype.personcontacttypecode == "manager")   .firstordefault(); 

would return

david 

i have tried many combinations of data annotations , fluent api can hardly remember started. seemed have best luck combination:

modelbuilder.entity<person>()     .hasmany(entity => entity.personcontacts)         .withrequired(person => person.person)         .hasforeignkey(xref => xref.personpersoncode)         .willcascadeondelete(false);  modelbuilder.entity<person>()     .hasmany(entity => entity.personcontacts)         .withrequired(xref => xref.contact)         .hasforeignkey(entity => entity.contactpersoncode)         .willcascadeondelete(false); 

but, when try add more 1 personcontact person, error:

multiplicity constraint violated. role 'person_personcontacts_source' of relationship '...entities.person_personcontacts' has multiplicity 1 or 0..1. 

i appreciate help, stumped right now. way, open changing these pocos if necessary.

i'd guess it's because using same navigation property link personcontact.person , personcontact.contact.

assuming this:

person {   int personcode {get; set;}   ...   virtual icollection<personcontact> personcontacts {get; set;} } 

try like:

modelbuilder.entity<personcontact>()     .hasrequired(x => x.person)         .withmany(x => x.personcontacts)         .hasforeignkey(x => x.personpersoncode)         .willcascadeondelete(false);  modelbuilder.entity<personcontact>()     .hasrequired(x => x.contact)         .withmany()         .hasforeignkey(x => x.contactpersoncode)         .willcascadeondelete(false);