Question

when working with the List class, i have noticed that the boolean i was looking for was:

 if(lstInts.Exists(x)){...}

X is a Predicate of T the same as lstInts. I was confused as to why you just cant pass int the int in this case, and why X’s type isnt of type T.

Example i was testing:

List<int> listInt = new List<int>();
int akey = Convert.toInt32(myMatch.Value);
Predicate<int> pre = new Predicate<int>(akey);  //akey is not the correct constructor param.
if(listInt.Exists(pre)){
   listInt.add(akey);
}

Is there a reason for having the additional Step of Predicate, or…. if i am going about the logic incorrectly?

I also noticed that the predicate constructure does not take an item of type T. Sort of confused as to how this is suppose to work.

Answer 1

You could also use Contains() method

List<int> listInt = new List<int>();
int akey = Convert.toInt32(myMatch.Value);

if(listInt.Contains(akey)){
  listInt.add(akey); 
}

Or alternately use Any()

if(listInt.Any(I => I == akey)) { 
  // Do your logic 
}