c# 串列埠 應答式順序下發命令 迴圈 間隔傳送指令
阿新 • • 發佈:2021-07-07
目錄
c# 串列埠 應答式順序下發命令 迴圈 間隔傳送指令
實現原理
難點
- 多個命令放在list 內如何順序傳送
- 如果保證應答
- 如何保證命令之間的延時
解決方法
- 1 2 使用 while await Task.Delay(1000) 解決
- 應答 使用AutoResetEvent解決
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示例程式碼
internal class Program { private static readonly AutoResetEvent _autoResetEvent = new AutoResetEvent(false); private static void Main(string[] args) { Console.WriteLine("Hello World!"); Test(); Console.ReadLine(); } private static void Test() { SerialPort serialPort = new SerialPort("COM2"); serialPort.Open(); SerialPort serialPort1 = new SerialPort("COM3"); serialPort1.ReceivedBytesThreshold = 6; serialPort1.DataReceived += ((se, ev) => { byte[] respBytes = new byte[6]; serialPort1.Read(respBytes, 0, 6); Console.WriteLine("COM3接收到的資訊:" + Encoding.UTF8.GetString(respBytes) + " " + respBytes.Length); _autoResetEvent.Set(); }); serialPort1.Open(); List<string> list = new List<string>() { "aaaccc", "bbbccc", "cccaaa", "ddddaaa" }; Task.Run(async () => { int i = 0; while (true) { await Task.Delay(1000); Console.WriteLine("執行COM1指令"); serialPort.Write(Encoding.UTF8.GetBytes(list[i]), 0, 6); i++; if (i == list.Count) i = 0; _autoResetEvent.WaitOne(); } }); } }
其他思路
思路一:解決順序執行
原文連結:https://www.cnblogs.com/cplemom/p/14290789.html
public static Task LoopAsync<T>(this IEnumerable<T> list, Func<T, Task> function) { return Task.WhenAll(list.Select(function)); } public async static Task<IEnumerable<TOut>> LoopAsyncResult<TIn, TOut>(this IEnumerable<TIn> list, Func<TIn, Task<TOut>> function) { var loopResult = await Task.WhenAll(list.Select(function)); return loopResult.ToList().AsEnumerable(); }
思路二:
程式碼出處:https://onebyone.icu/
登峰造極的成就源於自律private readonly int TimeoutInMilliseconds = 10000; //請求等待時長 public bool IsSuccess { get; set; }//預設false,如果接收結果則更改為true private bool CheckResult() { var s1 = new Stopwatch();//計時器 s1.Start(); do { if (!IsSuccess continue; IsSuccess = false; return true; } while (TimeoutInMilliseconds > s1.ElapsedMilliseconds); return false; }