线程的事件未执行..

liu_lxx 2014-05-20 03:03:17



WebBrowser w1;

private void button1_Click(object sender, EventArgs e)

        {

            Thread t = new Thread(p =>

            {

                w1 = new WebBrowser();

                w1.ObjectForScripting = this;

                w1.Navigate(System.Environment.CurrentDirectory + @"\test.html");

                w1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(GetBitmap);

            });

            t.TrySetApartmentState(ApartmentState.STA);

            t.Start();

        }

private void GetBitmap(object sender,WebBrowserDocumentCompletedEventArgs e)

        {

            HtmlElement element = w1.Document.Body;

            int w = element.ScrollRectangle.Width + element.OffsetRectangle.Width;

            int h = element.ScrollRectangle.Height + element.OffsetRectangle.Height;



            w1.Width = w;

            w1.Height = h;

            using (Bitmap bmp = new Bitmap(w, h))

            {

                w1.DrawToBitmap(bmp, element.ClientRectangle);

                string fileName = "d:\\" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".bmp";

                bmp.Save(fileName);

            }

        }

问题：运行时没进GetBitmap方法，刚开始接触线程，求详细指点..
PS:不用线程，是能进GetBitmap方法的

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liu_lxx 2014-05-20

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引用 6 楼 jan307 的回复:

WebBrowser w1;
AutoResetEvent autoResetEvent = new AutoResetEvent(false);
private void button1_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(p =>
            {
                w1 = new WebBrowser();
                w1.ObjectForScripting = this;
                w1.Navigate(System.Environment.CurrentDirectory + @"\test.html");
                w1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(GetBitmap);
                while (w1 .ReadyState != WebBrowserReadyState.Complete)
                {
                       Application.DoEvents();
                }
            });
            t.TrySetApartmentState(ApartmentState.STA);
            t.Start();
            t.Join();
        }
private void GetBitmap(object sender,WebBrowserDocumentCompletedEventArgs e)
        {
            HtmlElement element = w1.Document.Body;
            int w = element.ScrollRectangle.Width + element.OffsetRectangle.Width;
            int h = element.ScrollRectangle.Height + element.OffsetRectangle.Height;
  
            w1.Width = w;
            w1.Height = h;
            using (Bitmap bmp = new Bitmap(w, h))
            {
                w1.DrawToBitmap(bmp, element.ClientRectangle);
                string fileName = "d:\\" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".bmp";
                bmp.Save(fileName);
            }
               //即通知正在等待的线程有事件发生  
                autoResetEvent.Set();  
        }

行了谢谢，没加事件的时候还试过这种写法加了事件之后反而忘了不胜感激..

jan307 2014-05-20

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WebBrowser w1;
AutoResetEvent autoResetEvent = new AutoResetEvent(false);
private void button1_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(p =>
            {
                w1 = new WebBrowser();
                w1.ObjectForScripting = this;
                w1.Navigate(System.Environment.CurrentDirectory + @"\test.html");
                w1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(GetBitmap);
                while (w1 .ReadyState != WebBrowserReadyState.Complete)
                {
                       Application.DoEvents();
                }
            });
            t.TrySetApartmentState(ApartmentState.STA);
            t.Start();
            t.Join();
        }
private void GetBitmap(object sender,WebBrowserDocumentCompletedEventArgs e)
        {
            HtmlElement element = w1.Document.Body;
            int w = element.ScrollRectangle.Width + element.OffsetRectangle.Width;
            int h = element.ScrollRectangle.Height + element.OffsetRectangle.Height;
  
            w1.Width = w;
            w1.Height = h;
            using (Bitmap bmp = new Bitmap(w, h))
            {
                w1.DrawToBitmap(bmp, element.ClientRectangle);
                string fileName = "d:\\" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".bmp";
                bmp.Save(fileName);
            }
               //即通知正在等待的线程有事件发生  
                autoResetEvent.Set();  
        }

liu_lxx 2014-05-20

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引用 1 楼 pengyi_205 的回复:

异步事件完成，应该是异步还没有执行完，线程就结束了，所以你可以在 w1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(GetBitmap); 这句后面，设置一个信号量，让线程不要结束，然后在 private void GetBitmap(object sender,WebBrowserDocumentCompletedEventArgs e) 方法里，重置这个信号量。


WebBrowser w1;
AutoResetEvent autoResetEvent = new AutoResetEvent(false);
private void button1_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(p =>
            {
                w1 = new WebBrowser();
                w1.ObjectForScripting = this;
                w1.Navigate(System.Environment.CurrentDirectory + @"\test.html");
                w1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(GetBitmap);
                autoResetEvent .WaitOne();
            });
            t.TrySetApartmentState(ApartmentState.STA);
            t.Start();
        }
private void GetBitmap(object sender,WebBrowserDocumentCompletedEventArgs e)
        {
            HtmlElement element = w1.Document.Body;
            int w = element.ScrollRectangle.Width + element.OffsetRectangle.Width;
            int h = element.ScrollRectangle.Height + element.OffsetRectangle.Height;
 
            w1.Width = w;
            w1.Height = h;
            using (Bitmap bmp = new Bitmap(w, h))
            {
                w1.DrawToBitmap(bmp, element.ClientRectangle);
                string fileName = "d:\\" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".bmp";
                bmp.Save(fileName);
            }
               //即通知正在等待的线程有事件发生  
                autoResetEvent.Set();  
        }

这样改试试。

试过了，还是没有进GetBitmap方法额..

liu_lxx 2014-05-20

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引用 2 楼 pengyi_205 的回复:

话说，你为什以要另起一个线程呢？

如果不另起线程会报这样一个错：

这是一个测试的例子，原方法WebBrowser w1 = new WebBrowser();放在方法中的，不另起线程运行就报错

yzf86211861 2014-05-20

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.NET也写了 5年了多线程真的很少用学习围观大神

夺命胖子 2014-05-20

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话说，你为什以要另起一个线程呢？

夺命胖子 2014-05-20

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WebBrowser w1;
AutoResetEvent autoResetEvent = new AutoResetEvent(false);
private void button1_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(p =>
            {
                w1 = new WebBrowser();
                w1.ObjectForScripting = this;
                w1.Navigate(System.Environment.CurrentDirectory + @"\test.html");
                w1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(GetBitmap);
                autoResetEvent .WaitOne();
            });
            t.TrySetApartmentState(ApartmentState.STA);
            t.Start();
        }
private void GetBitmap(object sender,WebBrowserDocumentCompletedEventArgs e)
        {
            HtmlElement element = w1.Document.Body;
            int w = element.ScrollRectangle.Width + element.OffsetRectangle.Width;
            int h = element.ScrollRectangle.Height + element.OffsetRectangle.Height;
 
            w1.Width = w;
            w1.Height = h;
            using (Bitmap bmp = new Bitmap(w, h))
            {
                w1.DrawToBitmap(bmp, element.ClientRectangle);
                string fileName = "d:\\" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".bmp";
                bmp.Save(fileName);
            }
               //即通知正在等待的线程有事件发生  
                autoResetEvent.Set();  
        }

这样改试试。