“跨线程操作无效". ..在串行端口上读取数据时 [英] "Cross thread operation not valid" .. while reading data on Serial Port

问题描述

在Windows窗体应用程序中，在主窗体加载时，我已经设置了一个串行端口并开始读取它.目的是，当我在串行端口上收到一些数据时，我想打开与该数据相关的另一种形式.

In a windows form application, on main form load, i have set a serial port and started reading it. The purpose is, as and when I receive some data on the serial port, I want to open another form related to the data.

因此，我使用串行端口的DataReceived事件处理程序.

So i use the DataReceived Event Handler of the serial port.

  void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {

            string str = this.serialPort1.ReadLine();


                if (!string.IsNullOrEmpty(str))
                {


                    Main.Instance.customerData = new CustomerData(str);
                    Main.Instance.customerData.MdiParent = Main.Instance;  //Exeption received at this point
                    Main.Instance.customerData.Disposed += new EventHandler(customerData_Disposed);

                    Main.Instance.customerData.Show();


                }

        }

但是，当我尝试在事件处理程序中打开表单时，它给了我一个InvalidOperationExeption说: 跨线程操作无效:控制'Main'是从创建该线程的线程之外的线程访问的."

But when I try to open a form within the event handler it gives me an InvalidOperationExeption saying: "Cross-thread operation not valid: Control 'Main' accessed from a thread other than the thread it was created on."

我尝试删除代码行: Main.Instance.customerData.MdiParent = Main.Instance; 然后就可以了但是也有必要分配mdiparent，以便将其作为子窗体打开.

I tried removing the code line : Main.Instance.customerData.MdiParent = Main.Instance; then it works fine. But its necessary also to assign the mdiparent in order to open it as a child form.

是否有解决此问题的建议?

Any suggestions to resolve this problem ?

推荐答案

在Main窗体上使用Invoke方法.您必须将控制权传递给Main表单才能与其进行交互.事件处理程序在后台线程上触发.

Use the Invoke method on the Main form. You have to pass control over to the Main form to interact with it. The event handler is triggered on a background thread.

以下一些可能有效的示例代码:

Here's some sample code that may work:

void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
    string str = this.serialPort1.ReadLine();
    if (!string.IsNullOrEmpty(str))
    {
        ShowCustomerData(str);
    }   

}

private delegate void ShowCustomerDataDelegate(string s);

private void ShowCustomerData(string s)
{
    if (Main.Instance.InvokeRequired)
    {
        Main.Instance.Invoke(new ShowCustomerDataDelegate(ShowCustomerData), s);
    }
    else
    {

        Main.Instance.customerData = new CustomerData(str);
        Main.Instance.customerData.MdiParent = Main.Instance;  //Exeption received at this point
        Main.Instance.customerData.Disposed += new EventHandler(customerData_Disposed);

        Main.Instance.customerData.Show();
    }
}

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