是什么原因导致我的用户界面在关闭的串行端口时冻结？ [英] What causes my UI to freeze when closing a serial port?
问题描述
我工作的一个串行端口相关的应用程序。虽然使用的SerialPort 我需要更新与接收字节的文本框 DataReceived 事件：
I am working on a serial port related application. While using DataReceived event of SerialPort I need to update a textbox with the received bytes:
private void Connection_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
var data = Connection.ReadExisting();
_readBuffer.Add(indata);
Invoke(new EventHandler(AddReceivedPacketToTextBox));
}
所以，我用调用更新文本框。但是有一个很大的问题。当我尝试，我的UI被冻结，关闭连接，我觉得这是becase的调用正在做somehing可能。
So I use Invoke to update the textbox. But there is a big problem. When I try to close connection, my UI gets freezed, I think this is becase Invoke is doing somehing perhaps.
一个朋友说我应该用 RequiredInvoke ，但我不知道他真正的精神疾病。如何关闭没有搞乱的调用和UI线程的连接？
A friend said I should use RequiredInvoke, but I have no idea what he ment really. How can I close the connection without messing up the invoke and UI thread?
下面是我的亲密方式：
private void DisconnectFromSerialPort()
{
if (Connection != null && Connection.IsOpen)
{
Connection.Close();
}
}
更新
正如汉斯说我改变了调用到的BeginInvoke ，但现在它有点糟糕的是，我的应用程序停止由于工作 InvalidOperationException异常因为集合 _readBuffer 的修改（那是什么的详细说，在VS）
As Hans said I changed Invoke to BeginInvoke but now its a bit worse, my application stops working due to InvalidOperationException because the collection _readBuffer was modified (Thats what the detail says in VS)
下面是我的$ C $下添加文本到文本框：
Here is my code for adding text to textbox:
private void AddReceivedPacketToTextBox(object sender, EventArgs e)
{
foreach (var i in _readBuffer)
tbIn.Text += string.Format("{0:X2} ", i);
tbIn.Text += Environment.NewLine;
ScrollToBottom(tbIn);
label4.Text = _receivedPackets.ToString();
_receivedPackets++;
_readBuffer.Clear(); //Possibly because clearing collection gets out of sync with BeginInvoke??
}
2日更新
我仍然有这个问题，改变了的invoke（）到的BeginInvoke 没;吨的帮助。我也尝试添加断开连接，形成闭合事件NU成功......只要我闭上我的形式，它获得的股票（我的意思是它的父的形式，因为这种形式可以访问的SerialPort正在从另一个form`调用。
I still have the problem, changing the Invoke() to BeginInvoke didn;t help. I also tried to add disconnect to form closing event nu success...anytime I close my form it gets stock (I mean its parent form, because this form that has access to serialport is being called from another form`.
我的意思是我想通了，用户界面被锁定只有2例：如果我时钟一个按钮，要求的Connection.close（）另外，如果我试图关闭形式，即某些对象被设置父窗体会抛出异常。
I mean I figured out that the UI gets locked only in 2 cases: If I clock a button which calls Connection.Close() also if I try to close the form, the parent form will throw exception that some objects are disposed.
我称这样的串行形式从父窗体：
I call the serial form like this from the parent form:
public DebugForm DebugForm;
private void button1_Click(object sender, EventArgs e)
{
if (DebugForm != null)
{
DebugForm.BringToFront();
return;
}
DebugForm = new DebugForm();
DebugForm.StartPosition = FormStartPosition.CenterScreen;
DebugForm.Closed += delegate
{
WindowState = FormWindowState.Normal;
DebugForm = null;
};
DebugForm.Show();
WindowState = FormWindowState.Minimized;
}
难道这是问题吗？！
Could this be the problem?!
推荐答案
这个问题可以通过添加一个计时器来解决：
The problem could be solved by adding a timer:
bool formClosing = false;
private void Connection_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
if (formClosing) return;
_buffer = Connection.ReadExisting();
Invoke(new EventHandler(AddReceivedPacketToTextBox));
}
protected override void OnFormClosing(FormClosingEventArgs e)
{
base.OnFormClosing(e);
if (formClosing) return;
e.Cancel = true;
Timer tmr = new Timer();
tmr.Tick += Tmr_Tick;
tmr.Start();
formClosing = true;
}
void Tmr_Tick(object sender, EventArgs e)
{
((Timer)sender).Stop();
this.Close();
}
由于JohnWein从<一个href="http://social.msdn.microsoft.com/Forums/en/winforms/thread/cd2f052c-b245-4df7-a935-d0b1be943cf3"相对=nofollow> MSDN
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