global::
关键字在C#中的使用是什么?我们何时需要使用这个关键字?
从技术上讲,global
不是关键字:它是所谓的“上下文关键字”。这些仅在有限的程序上下文中具有特殊含义,并且可以在该上下文之外用作标识符。
只要存在歧义或成员被隐藏,就应该使用global
。来自这里:
class TestApp
{
// Define a new class called 'System' to cause problems.
public class System { }
// Define a constant called 'Console' to cause more problems.
const int Console = 7;
const int number = 66;
static void Main()
{
// Error Accesses TestApp.Console
Console.WriteLine(number);
// Error either
System.Console.WriteLine(number);
// This, however, is fine
global::System.Console.WriteLine(number);
}
}
global
无法使用:// See: no namespace here
public static class System
{
public static void Main()
{
// "System" doesn't have a namespace, so this
// will refer to this class!
global::System.Console.WriteLine("Hello, world!");
}
}