c# - default values for IEnumerable collection when length is zero -


i have ienumerable collection:

public ienumerable<config> getconfig(string cid, string name) {     var raw = db.ap_getinfo(cid, name);     foreach (var item in raw.tolist().where(x => x.name!= null))                            {         var x = raw.count();             yield return new config             {                 name = item.name.tostring(),                                         value = item.value.tostring(),             };             }         }

the problem facing if return length of 0 unable set attributes else, if have response of length 1 attributes set database, length 0 want set dfault value name , value.

a linq solution - returns default if there no items in enumerable using defaultifempty:

public ienumerable<config> getconfig(string cid, string name) {     return db.ap_getinfo(cid, name)         .where(x => !string.isnullorempty(x.name))         .select(x => new config         {             name = x.name.tostring(),             value = x.value.tostring(),         })         .defaultifempty(new config         {             name = "defaultname",             value = "defaultvalue"         }); }

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