Code inspection: Use collection's count property

If a collection has a Count property (or a Length property), ReSharper suggests using the property instead of the Count() method. The property works faster (to see why, read the StackOverflow answers linked in the See Also below). Such a replacement is only possible for collections that implement ICollection<T> or its derived interfaces.

For arrays, ReSharper suggests replacing Count() with Length:

            
public int BooksCount(string[] books)
{
    return books.Count();
}

            
public int BooksCount(string[] books)
{
    return books.Length;
}

For other collection types, ReSharper suggests replacing Count() with Count:

            
public int ToysCount(IList<string> toys)
{
    return toys.Count();
}

            
public int ToysCount(IList<string> toys)
{
    return toys.Count;
}

Last modified: 08 April 2024