Question

大家。

我有以下两种形式

From1有一个按钮，当点击此Form2时会出现。
From2有一个Progressbar，它正在计算并从Maximun值更新Progressbar，直到它完成，Form2将关闭。

下面的Form2代码

public delegate void ProgressbarHandler(int value);
public partial class Form2 : Form
{

    public event WaitCallback CloseThreadEvent;

    private Thread t;

    public void OnCloseEvent(ThreadState state)
    {
        if (CloseThreadEvent != null)
            CloseThreadEvent(state);
    }

    public Form2()
    {
        InitializeComponent();

        progressBar1.Minimum = 0;
        progressBar1.Maximum = 20000;
    }
    private void Form2_Load(object sender, EventArgs e)
    {
        InitThread();
    }

    private void InitThread()
    {
        t = new Thread(new ThreadStart(RunThread));
        t.Start();

        CloseThreadEvent += new WaitCallback(CloseForm);

        Thread tt = new Thread(ThreadObserver);
        tt.IsBackground = true;
        tt.Start();
    }
    private void RunThread()
    {
        for (int i = 0; i < progressBar1.Maximum; i++)
        {
            progressBar1.Invoke(new ProgressbarHandler(UpdateProgressbar), i);
        }
    }
    private void UpdateProgressbar(int value)
    {
        progressBar1.Value = value + 1;
    }

    private void ThreadObserver()
    {
        while (t.IsAlive)
        {
            OnCloseEvent(t.ThreadState);
        }
    }
    private void CloseForm(Object state)
    {
        if ((ThreadState)state == ThreadState.Stopped)
            this.Close();
    }
}

从我的代码中，它在

this.Close();

请提出建议，如何根据我的目的编码。

谢谢。

Answer 1

您只能从创建它们的线程访问控件。表格也是一种控制。

查看Control.Invoke。

我使用类似这样的类来处理这些场景：

public static class ControlExtensions
{
    public static void Invoke(this Control control, Action action)
    {
        if (control.InvokeRequired)
        {
            control.Invoke(new MethodInvoker(action), null);
        }
        else
        {
            action.Invoke();
        }
    }
}

然后，您就可以致电this.Invoke(() => Close());关闭表单。

Answer 2

非常简单的修复。

this.Invoke(new MethodInvoker(delegate { this.Close(); }));

我不知道你为什么没想到它？不是很明显吗？：P

Answer 3

谢谢大家

它有效!!

    public partial class Form2 : Form
{  
    private Thread tstart, trun;

    public Form2()
    {
        InitializeComponent();

        progressBar1.Minimum = 0;
        progressBar1.Maximum = 100;
    }
    private void Form2_Load(object sender, EventArgs e)
    {
        tstart = new Thread(InitThread);
        tstart.Start();
    }

    private void InitThread()
    {
        trun = new Thread(new ThreadStart(RunThread));
        trun.Start();
        trun.Join();

        CloseForm(trun.ThreadState);
    }
    private void RunThread()
    {
        for (int i = 0; i < progressBar1.Maximum; i++)
        {
            Thread.Sleep(10);
            progressBar1.Invoke(new MethodInvoker(delegate { progressBar1.Increment(1); }));                            
        }
    }
    private void CloseForm(Object state)
    {
        if ((ThreadState)state != ThreadState.Stopped)               
            return;            
        else
        {
            if (this.InvokeRequired)
                this.Invoke(new MethodInvoker(delegate { this.Close(); }), null);
        }
    }

    private void Form2_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (tstart.IsAlive)
            tstart.Abort();
        if (trun.IsAlive)
            trun.Abort();
    }

}

线程完成后关闭表单

3 个答案: