c# - Remove an item from ienumerable<string> -

i have method expect ienumerable<string> can see here :

  public static string fromdecimalascii(ienumerable<string> input)         {              return new string(input.select(s => (char)int.parse(s)).toarray());         } 

but every time last record of ienumerable empty got error in line because of :

    return new string(input.select(s => (char)int.parse(s)).toarray()); 

so have remove item ienumerable .

the error:input string not in correct format ideas appreciated.

best regards

you need filter collection where:

return new string(input.where(s => !string.isnullorempty(s))                        .select(s => (char)int.parse(s)).toarray()); 

you can use extension method use tryparse:

static class extensions {     public delegate bool tryparsedelegate<tsource>(string s, out tsource source);      public static ienumerable<tresult> whereparsed<tsource, tresult>(                                                ienumerable<tsource> source,                                                tryparsedelegate<tresult> tryparse)     {           // todo: check arguments against null first          foreach (var item in source)         {             tresult result;             if (tryparse(item != null ? item.tostring() : null, out result))             {                 yield return result;             }         }     } }  

usage:

var collection = input.whereparsed<string, int>(int.tryparse)                       .cast<char>()                       .toarray(); return new string(collection);