什么是全球::? [英] What is global::?
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问题描述
在C#我看全球::
用于经常在自动生成的代码。这是不是我使用过自己,所以我不知道目的是什么。有人能解释一下吗?
In C# I see global::
used quite often in auto-generated code. It is not something I have ever used myself so I don't know what the purpose is. Can someone explain this?
推荐答案
全局指的是全局命名空间,它可以用来解决问题,让你可以重新定义类型。例如: -
global refers to the global namespace, it can be used to solve problems whereby you may redefine types. For example: -
class foo
{
class System
{
}
}
如果您要使用系统的地方
If you were to use System where it would be locally scoped in the foo class, you could use: -
global::System.Console.WriteLine("foobar");
访问全局命名空间
to access the global namespace
示例
using System;
class Foo
{
public void baz()
{
Console.WriteLine("Foo 1");
}
}
namespace Demo
{
class Foo
{
public void baz()
{
Console.WriteLine("Foo 2");
}
}
class Program
{
protected static global::Foo bar = new global::Foo();
static void Main(string[] args)
{
bar.baz(); // would write Foo 1 to console as it refers to global scope
Foo qux = new Foo();
qux.baz(); // would write Foo 2 to the console as it refers to the Demo namespace
}
}
}
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