Count() a specfic attribute within a list c#

Question

if (gardenvlist.Count() == getava.Count())
{

}
else if(oceanvlist.Count() == getava.Count())
{

}
else if (cityvlist.Count() == getava.Count())
{

}

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Answer 1

There is another overload of Count() that takes a lambda expression as a parameter where you can filter elements to count from the source collection.

Say you have a list of strings like this:

var list = new List() {
   "a",
   "b",
   "c",
   "aa",
   "bbb"
};

Then you can use it like this:

var countSingles = list.Count(str => str.Length == 1);

This will count the elements of the list with length 1, so here it would return 3.