https://www.cnblogs.com/axzxs2001/p/9552186.html
PID对象是代表Actor对象的进程，是能过Actor.Spawn(props)获取的；它有什么成员呢？既然代理Actor，首先有一个ID，标识自己是谁，Actor在Spawn时可以命名这个ID，否则会自动生成。还有三种向邮箱发消息的方法，Tell()，Request()，RequestAsync()，还有一个发送系统消息(Started,Stoping,Stoped等)方法SendSystemMessage()，还有一个停止的方法Stop()。
1 using Proto;
2 using System;
3 using System.Threading;
4 using System.Threading.Tasks;
5
6 namespace P004_PID
7 {
8 class Program
9 {
10 static void Main(string[] args)
11 {
12 var props = Actor.FromProducer(() => new MyActor());
13 var pid = Actor.Spawn(props);
14 while (true)
15 {
16 Console.WriteLine("**************************************");
17 Console.WriteLine("1、单向请求Tell 2、单向请求Request 3、双向请求RequestAsync");
18 switch (Console.ReadLine())
19 {
20 case "1":
21 Console.WriteLine("单向请求开始");
22 pid.Tell(new Request { Name = "单向请求 Tell", RequestType = "one-way", Time = DateTime.Now });
23 break;
24 case "2":
25 Console.WriteLine("单向请求开始");
26 //无法接回应签，与官网说法不一
27 pid.Request(new Request { Name = "单向请求 Request", RequestType = "two-way-1", Time = DateTime.Now }, pid);
28
29 break;
30 case "3":
31 Console.WriteLine("双向请求开始");
32 var response = pid.RequestAsync<Response>(new Request { Name = "双向请求 RequestAsync", RequestType = "two-way-2", Time = DateTime.Now }).Result;
33 Console.WriteLine(response.Time + ":" + response.Name);
34 break;
35 }
36 Thread.Sleep(2000);
37 }
38 }
39 }
40
41 public class MyActor : IActor
42 {
43 public Task ReceiveAsync(IContext context)
44 {
45
46 if (context.Message is Request request)
47 {
48 switch (request.RequestType)
49 {
50 case "one-way"://context.Sender为null
51 Console.WriteLine("接收到：" + request.RequestType + "," + request.Time + ":" + request.Name);
52 break;
53 case "two-way-1"://context.Sender= context.Self为自己
54 Console.WriteLine("接收到：" + request.RequestType + "," + request.Time + ":" + request.Name);
55 context.Respond(new Response() { Time = DateTime.Now, Name = "服务端应答 two-way-1" });
56 break;
57 case "two-way-2"://context.Sender!= context.Self为新实例
58 Console.WriteLine("接收到：" + request.RequestType + "," + request.Time + ":" + request.Name);
59 context.Respond(new Response() { Time = DateTime.Now, Name = "服务端应答 two-way-2" });
60 break;
61 }
62 }
63 return Actor.Done;
64 }
65 }
66
67 public class Request
68 {
69 public string Name
70 { get; set; }
71 public string RequestType
72 { get; set; }
73 public DateTime Time
74 { get; set; }
75 }
76
77 public class Response
78 {
79 public string Name
80 { get; set; }
81 public DateTime Time
82 { get; set; }
83 }
84 }
Actor中的Receive接到消息后，Context是中有两个PID对象，一个Self，一个Sender，Tell方法到达后，Sender对象为空；Request到达后，Sender=Self；而RequestAsync则Sender,Self都有对象，但不相同，这是一个区别。再有就是Tell和Request都是单向调用（我实测与官方文档说明有出入），RequestAsync是可以有返回值的，详见代码，如下是运行结果：
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