C#:使用 Winforms 关闭 SerialPort 的正确方法

C#: Proper way to close SerialPort with Winforms(C#:使用 Winforms 关闭 SerialPort 的正确方法)

问题描述

我有一个应用程序，我从串口读取，一切正常，直到我关闭应用程序.当我单击 [X] 时，应用程序只是挂起，UI:无响应.

I have an app where I read from the serialport, everything goes fine, until I close the app. When I click on the [X] the app simply hangs, the UI: unresponsive.

我从 DataReceived 事件处理程序中的端口读取，并在 FormClosed 发生时关闭端口:

I read from the port in the DataReceived event handler, and I close the port when FormClosed happens:

    private void MainForm_FormClosed(object sender, FormClosedEventArgs e)
    {
        mySerialPort.Close();
    }

推荐答案

不是bug.

关闭它时它会挂起的唯一原因是因为在 SerialPort 对象的事件处理程序中，您正在与主线程同步调用(通常通过调用调用).SerialPort 的 close 方法等待触发 DataReceived/Error/PinChanged 事件的 EventLoopRunner 线程终止，但由于您自己的事件代码也在等待主线程响应，因此您遇到了死锁情况.

The only reason it would hang when you close it is because in the event handler of your SerialPort object, you're synchronizing a call with the main thread (typically by calling invoke). SerialPort's close method waits for its EventLoopRunner thread which fires DataReceived/Error/PinChanged events to terminate, but since your own code in the event is also waiting for main thread to respond, you run into a dead lock situation.

错误报告按设计"关闭的原因是因为错误"在您自己的代码中.

The reason the bug report was closed 'as designed' is because the 'bug' is in your own code.

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