c# - Linq List of Objects GroupBy Multiple Property Equality -

i have list<reportobject> , want able combine elements of list single element based on equality of properties 1 element matching other properties second element in list. in case, want update first element values second element , return list collection of "first elements".

perhaps groupby (or linq in general) isn't right solution here, seem lot cleaner doing traditional foreach loop , newing second list. want this:

list<reportobject> thelist = new list<reportobject>()                            { new reportobject() { property1 = "1", property2 = "2" },                             new reportobject() { property1 = "2", property2 = "3" }                             new reportobject() { property1 = "1", property2 = "3" } };  list<reportobject> newlist = new list<reportobject>(); for(int = 0; < thelist.count; i++) {     for(int j = + 1; < thelist.count; j++)     {        if (thelist[i].property1 == thelist[j].property2)        {            thelist[i].property2 = thelist[j].property2);            newlist.add(thelist[i]);             thelist.removeat(j);        }     } }  return newlist; 

from code, it's newlist contain items have property1 = property2:

var newlist = thelist.selectmany((x,i)=>                                  thelist.where((y,j)=>j>i && y.propery2 == x.propery1)                                         .select(a=> new reportobject{                                                       property1=x.property1,                                                       property2=x.property1                                                       });