c# - Linq Expression Get Predicated Items From Last With a Function -

are there linq expression exists gives predicated list end of source list.

i.e: "abc1zxc".tochararray().somemagiclinq(p=>char.isletter(p));

should give "zxc"

you use approach:

var lastletters = "abc1zxc".reverse().takewhile(char.isletter).reverse(); string lastlettersstring = new string(lastletters.toarray()); 

not efficient way working , readable.

if need single (optimized) method use this:

public static ienumerable<tsource> getlastpart<tsource>(this ienumerable<tsource> source, func<tsource, bool> predicate)  {     var buffer = source ilist<tsource> ?? source.tolist();     var reverselist = new list<tsource>();     (int = buffer.count - 1; >= 0; i--)     {         if (!predicate(buffer[i])) break;         reverselist.add(buffer[i]);     }     (int = reverselist.count - 1; >= 0; i--)     {         yield return reverselist[i];     } } 

then it's more concise:

string lastletters = new string("abc1zxc".getlastpart(char.isletter).toarray());