C Sharp

擴充方法

Source: https://msdn.microsoft.com/zh-tw/library/bb383977.aspx

namespace ExtensionMethods
{
    public static class MyExtensions
    {
        public static int WordCount(this String str)
        {
            return str.Split(new char[] { ' ', '.', '?' }, 
                             StringSplitOptions.RemoveEmptyEntries).Length;
        }
    }   
}


string s = "Hello Extension Methods";  
int i = s.WordCount();