c# - Lambda expressions query null field -


well, have following query use search list text user has filled.

it's 1 textbox search in these fields below, it's working when 1 of these fields null, it's throwing null reference exception, how can avoid that?

list<rep_medidordisplay> searchfiltered = new list<rep_medidordisplay>();             if (filter != string.empty)             {                 searchfiltered.clear();                 foreach (string item in filter.split(';').tolist<string>())                 {                     searchfiltered.addrange(medidores.where(x => x.data_toi.contains(item.trim()) ||                         x.elemento.toupper().contains(item.trim()) ||                         x.fase.toupper().contains(item.trim()) ||                         x.id.toupper().contains(item.trim()) ||                         x.kdke.toupper().contains(item.trim()) ||                         x.n_equipamento.toupper().contains(item.trim()) ||                         x.status.toupper().contains(item.trim()) ||                         x.tensao.toupper().contains(item.trim())));                  }             }

i hope guys can me. thanks.

by checking null first:

(x.elemento != null && x.elemento.toupper().contains(item.trim())) || // etc

of course should calculate item.trim() once , reuse value tests rather trimming many times there fields.


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