C# 命名空间（Namespace）相关知识总结

namespace namespace_name
{
  // 代码声明
}

namespace_name.item_name;

using System;
namespace first_space
{
  class namespace_cl
  {
   public void func()
   {
     Console.WriteLine("Inside first_space");
   }
  }
}
namespace second_space
{
  class namespace_cl
  {
   public void func()
   {
     Console.WriteLine("Inside second_space");
   }
  }
} 
class TestClass
{
  static void Main(string[] args)
  {
   first_space.namespace_cl fc = new first_space.namespace_cl();
   second_space.namespace_cl sc = new second_space.namespace_cl();
   fc.func();
   sc.func();
   Console.ReadKey();
  }
}

Console.WriteLine ("Hello there");

System.Console.WriteLine("Hello there");

using System;
using first_space;
using second_space;

namespace first_space
{
  class abc
  {
   public void func()
   {
     Console.WriteLine("Inside first_space");
   }
  }
}
namespace second_space
{
  class efg
  {
   public void func()
   {
     Console.WriteLine("Inside second_space");
   }
  }
} 
class TestClass
{
  static void Main(string[] args)
  {
   abc fc = new abc();
   efg sc = new efg();
   fc.func();
   sc.func();
   Console.ReadKey();
  }
}

namespace namespace_name1 
{
  // 代码声明
  namespace namespace_name2 
  {
   // 代码声明
  }
}

using System;
using SomeNameSpace;
using SomeNameSpace.Nested;

namespace SomeNameSpace
{
  public class MyClass
  {
    static void Main()
    {
      Console.WriteLine("In SomeNameSpace");
      Nested.NestedNameSpaceClass.SayHello();
    }
  }

  // 内嵌命名空间
  namespace Nested 
  {
    public class NestedNameSpaceClass
    {
      public static void SayHello()
      {
        Console.WriteLine("In Nested");
      }
    }
  }
}