Question

以第二种形式异步打印消息。 System.Windows.Forms.dll期间的System.ObjectDisposedException 第二种形式的结束。

MainForm运行SecondForm。 SecondForm在文本框中运行消息生成器和消息打印的异步线程。消息生成器创建具有随机时间延迟的消息字符串格式的时间延迟是此消息。问题 - 在第二个表单关闭期间，方法SecondForm_Closing，我收到例外

System.Windows.Forms.dll中的System.ObjectDisposedException 期间无法访问已处置的对象。

public partial class MainForm : Form
{
    secondForm SecondForm;
    private void MainForm_Closing(object o, FormClosingEventArgs e)
    {
        Environment.Exit(0);
    }
    public MainForm()
    {
        InitializeComponent();
        SecondForm = new secondForm();
        SecondForm.Show();
    }
}
public partial class secondForm : Form
{
    private messageGenerator MessageGenerator;
    Action actPrint;
    //This method calls ObjectDisposedException then point to Invoke in method Print
    private void SecondForm_Closing(object o, FormClosingEventArgs e)
    {
        Close();
    }
    public secondForm()
    {
        InitializeComponent();
        MessageGenerator = new messageGenerator();
        actPrint = new Action(Print);
        actPrint.BeginInvoke(null, null);
    }
    public void Print()
    {
        while (true)   //  Infinite  cycle
        {
            MessageGenerator.CreateEvent.WaitOne(); //  Wait event "Message is created"
            MessageGenerator.CreateEvent.Reset();//  Event reset
            Invoke(new MethodInvoker
            (() =>
            {
                TextBoxTimeDelay.Text = MessageGenerator.Message;//  Message print
            }));
        }
    }
}
public class messageGenerator
{
    public AutoResetEvent CreateEvent;
    public string Message;
    public Action actStart;
    public messageGenerator()
    {
        CreateEvent = new AutoResetEvent(false);
        actStart = new Action(Start);
        actStart.BeginInvoke(null, null);
    }
    public void Start()
    {
        Random R = new Random();
        while (true)
        {
            int TimeDelay = 10 * R.Next(1, 5);
            Thread.Sleep(TimeDelay);
            Message = TimeDelay.ToString();
            CreateEvent.Set();  //  Event "Message is created"
        }
    }
}

来自here的解决方案没有实现资源。即MessageGenerator继续，和打印方法工作。如何实现资源？

private void SecondForm_Closing (object o, FormClosingEventArgs e)
{
    e.Cancel = true;
    this.Hide();
    this.Parent = null;
}

无法访问已处置的对象。以第二种形式异步打印消息

0 个答案: