What's the difference between String.Count and String.Length?

Question

I'm using them alternately, is there any difference between them?

Answer 1

On the surface they would seem functionally identical, but the main difference is:

• Length is a property that is defined of strings and is the usual way to find the length of a string

• .Count() is implemented as an extension method. That is, what string.Count() really does is call Enumerable.Count(this IEnumerable<char>), a System.Linq extension method, given that string is really a sequence of chars.

Performance concerns of LINQ enumerable methods notwithstanding, use Length instead, as it's built right into strings.

Answer 2

String implements the IEnumerable, so it has a method Count while Length is a property in the String class.