函数只能在其定义的代码块中使用。
using System; namespace a { class Program { static void Write() { string myString ="String defined in Write()"; Console.WriteLine("Now in Write()"); Console.WriteLine("myString={0}",myString); } static void Main(string[] args) { string myString="String defined in Main()"; Write(); Console.WriteLine("\nNow in Main()"); Console.WriteLine("myString={0}",myString); Console.ReadKey(); } } }