嵌套的静态类C#

本文关键字:静态类 嵌套 | 更新日期: 2023-09-27 17:58:42

我想知道是否可以得到一个对象,它调用了静态类的静态方法例如:

public class Person
{
    private static class TelephoneLine
    {
        public static string sharedString = string.Empty;
        public static void NotifyOnCall()
        {
            //notify if someone call this person
        }
        public static void Comunicate(Person comunicateWith, string message)
        {
            sharedString = "Sender: " /* Object which called that method */ + " To: " + comunicateWith.Name +
                           " said: " + message;
        }
    }
    public Person(string name)
    {
        Name = name;
    }
    string Name;
    public void CallTo(Person person, string message)
    {
        TelephoneLine.Comunicate(person, message);
    }
    public void ShowCall()
    {
        Console.Write(TelephoneLine.sharedString);
    }
}

}

那么,除了在ThelephoneLine.Communicate(this,comunicateWith,msg)的参数中传递"Sender"之外,还有什么可能得到它吗?

嵌套的静态类C#

使用堆栈爬网是可能的(前提是防止静态方法内联),但这通常是个坏主意。

从方法中检索调用方法名称

如果可以的话,这样做是为了调试目的。这样做是因为你太懒了,没有把它明确地写进你的正常程序流中,这是非常糟糕的设计。因此,在您的情况下,我强烈建议手动传递它。


有点偏离主题,但我很确定你的类不应该是静态的。静态方法适用于简单的无副作用函数(有关好的示例,请参见MathEnumerable)。你的TelephoneLine至少应该是一个Singleton,但IMO你应该简单地使用依赖注入并注入它的一个实例。

简单的答案是否定的。许多.NET自己的事件(WinForms或ASP中的Clicked等)都需要传递一个"sender"参数。

您可以查看堆栈来获得方法的名称,甚至可能获得调用方的类型,但您肯定无法获得调用该函数的特定对象。

一种方法是在人员和服务之间定义一个通用接口,并使用其合约传递数据:

对于嵌套的私有服务类来说,通用解决方案可能有些过头了,但您可能需要扩展以后可以进行电话呼叫的内容,并将其重构为公共的,例如自动服务呼叫之类的。

public interface ICallable { string CallerIdString(); }
public class Person : ICallable
{
    private static class TelephoneLine
    {
        public static string sharedString = string.Empty;
        public static void NotifyOnCall()
        {
            //notify if someone call this person
        }
        public static void Comunicate<TCaller>(TCaller Caller, Person comunicateWith, string message) where TCaller : ICallable
        {
            sharedString = "Sender: " + Caller.CallerIdString() + " To: " + comunicateWith.Name +
                           " said: " + message;
                           sharedString.Dump();
        }
    }
    public Person(string name)
    {
        Name = name;
    }
    string Name;
    public void CallTo(Person person, string message)
    {
        TelephoneLine.Comunicate<Person>(this, person, message);
    }
    public void ShowCall()
    {
        Console.Write(TelephoneLine.sharedString);
    }
    public string CallerIdString() { return this.Name;}
}

TelephoneLine类不应该真正归Person所有(它们归电话公司所有!),也不应该是静态的(static==代码气味)。

class TelephoneLine
{
  public TelephoneLine (Person sender, Person receiver)
  {
    m_sender = sender;
    m_receiver = receiver;
  }
  public void Send (Person from, String message)
  {
    if (from == sender)
    {
       output "From: " + m_sender + " To: " + m_receiver + " Message: " + message;
    }
    else
    {
       output "From: " + m_receiver + " To: " + m_sender + " Message: " + message;
    }
  }
  Person m_sender, m_receiver;
};
class Person
{
  public void MakeCall (Person receiver, string message)
  {
     TelephoneLine line = new TelephoneLine (this, receiver);
     line.Send (this, message);
  }
}

事实上,TelephoneLine对象应该属于其他对象:

class Exchange
{
  public TelephoneLine MakeCall (Person from, Person to)
  {
    // check that 'to' can receive call first!
    return new TelephoneLine (from, to);
  }
};
class Person
{
  public void MakeCall (Person receiver, string message)
  {
     TelephoneLine line = the_exchange.MakeCall (this, receiver);
     if (line != null)
     {
       line.Send (this, message);
     }
     // else, receiver not listening!
  }
}