c# - Why list show strange behaviour? -


work on vs2010 ef,c#.

have 2 list(olistranitem,olisttaxitem) ,need copy 1 list properties values in list ,then need work on new list.problem after copy content element 1 list list type of changes impact on both list ,why happen ,i change on list changes occur in both list please check bellow syntax.

            list<transactionitem> olistranitem = new list<transactionitem>();             list<transactionitem> olisttaxitem = new list<transactionitem>();              olistranitem = _transactionitem;             olisttaxitem = _transactionitemtax;              transactionitem tmpitem = new transactionitem();              tmpitem = olistranitem.where(item => item.quotationdetailid == quotationdetailid && item.action != entity.actionmode.delete && item.isdeleted == false).firstordefault();              if (tmpitem.isnotnull())             {                  tmpitem.action = entity.actionmode.add;                 olisttaxitem.add(tmpitem);              }             else             {                 _transactionitemtax = new list<transactionitem>();             }              int ncounter = 5;              foreach (transactionitem item in olisttaxitem)             {                   if (item.quotationtaxid ==0)                 {                     ncounter = ncounter + 1;                      item.quotationtaxid = ncounter;                   }     }

please me identify why problem aries,how solve problem.

if have query please ask,thanks in advanced.

transactionitem class, right? , not struct.

every type that's class is, default, reference type. means have in lists not real values of transaction items, references (think c++ pointers) values. when copy data 1 list other, you're copying references.

you need clone items 1 list another. give class method clone instances, , use method copy items 1 list another.


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