在.NET开发过程中，定时器（Timer）是一种常用的实现定时任务的技术手段。然而，在使用.NET提供的定时器类（如System.Timers.Timer、System.Threading.Timer或System.Windows.Forms.Timer）时，开发者经常会遇到一个实际问题：定时器的回调方法（即定时器到期后所执行的方法）不能直接传递参数。本文将对这一问题进行详细分析，并给出实用的解决方法。
问题分析
以System.Threading.Timer为例，其构造函数签名如下：
public Timer(TimerCallback callback, object state, int dueTime, int period);

其中，TimerCallback委托定义如下：
public delegate void TimerCallback(object state);

也就是说，无论你期望在定时回调时传递多少个参数，最终的回调方法只允许有一个object类型的参数。这一机制在System.Timers.Timer.Elapsed事件和System.Windows.Forms.Timer.Tick事件中也是类似的，要么无参、要么只提供一个系统自动产生的事件参数。因此，我们无法像普通方法调用一样，自由地传递任意类型、任意数量的参数。
为什么不能直接传参？
.NET定时器设计的初衷是为了兼容多线程、简化调度模型，同时减少委托签名复杂度。这种设计使得系统可以更容易地调用用户定义的回调方法，也方便框架层面的管理，但带来的限制就是无法像普通方法那样灵活传参。对于一些需要携带上下文信息的场景，就需要开发者采用变通办法。
解决方法
1. 利用State参数传递复合参数对象
由于回调只接受一个object参数，可以将需要的所有参数封装进一个自定义类（或元组、字典），在回调内部再进行解包。例如：
public class MyParams
{
public int Id { get; set; }
public string Name { get; set; }
}

void MyCallback(object state)
{
var myParams = (MyParams)state;
// 使用myParams.Id和myParams.Name
}

// 定时器实例化
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