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
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();           }
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();           }