c# - Generalize a function -

i trying figure out if there way generalize function takes hashset of 2 unrelated objects similar attributes. have sample code below:

private ilist<idictionary<string, string>> builddictionary(hashset<classa> classa) {     ilist<idictionary<string, string>> data = new list<idictionary<string, string>>();     foreach (var in classa)     {         dictionary<string, string> adictionary = new dictionary<string, string>();         adictionary.add(a.code, a.code + "," + a.name);         data.add(adictionary);     }      return data; }  private ilist<idictionary<string, string>> builddictionary(hashset<classb> classb) {     ilist<idictionary<string, string>> data = new list<idictionary<string, string>>();     foreach (var b in classb)     {         dictionary<string, string> bdictionary = new dictionary<string, string>();         bdictionary.add(b.code, b.code + "," + b.name);         data.add(bdictionary);     }      return data; } 

thus evident code, 2 classes not related both in hashset , contain similar attributes (code, name). have tried using generic t failed due fact don't have generic class t created. there anyway around issue without creating new class?

if source classes sealed or can't modified common interface, can use accessors parts needed, 1 might in linq queries.

here's example implementation. note tokey() , tomembervalue() named more appropriately, enough replicate doing class can specify lambda retrieve relevant property, , isn't dependent upon class having same property names long lambda written accordingly. main() shows use method both cases.

public ilist<idictionary<string, string>> builddictionary<t>(hashset<t> sourceset, func<t, string> tokey, func<t, string> tomembervalue) {   ilist<idictionary<string, string>> data = new list<idictionary<string, string>>();    foreach (var element in sourceset)   {     dictionary<string, string> newlookup = new dictionary<string, string>();     newlookup.add(tokey(element), $"{tokey(element)},{tomembervalue(element)}");     data.add(newlookup);   }    return data; }  void main() {   hashset<classa> setofas = new hashset<classa>(new[] { new classa { code = "foo", name = "bar" }, new classa { code = "foo2", name = "bar2" } });   hashset<classb> setofbs = new hashset<classb>(new[] { new classb { code = "foo", name = "bar" }, new classb { code = "foo2", name = "bar2" } });    var lookupofas = builddictionary(setofas, x => x.code, x => x.name);   var lookupofbs = builddictionary(setofbs, x => x.code, x => x.name); }  // define other methods , classes here public class classa {   public string code { get; set; }   public string name { get; set; } }  public class classb {   public string code { get; set; }   public string name { get; set; } }