Question

当我尝试在backgroundWorker.DoWork函数中使用webBrowser组件时，我遇到了这个例外：

System.InvalidCastException未被用户代码

处理

http://i.stack.imgur.com/EJFT3.jpg

这是我的代码：

void m_oWorker_DoWork(object sender, DoWorkEventArgs e)
    {
        //NOTE : Never play with the UI thread here...
        string line;

        //time consuming operation
        while ((line=sr.ReadLine()) != null ){

            int index = line.IndexOf(":");
            HtmlDocument doc = web.Document;
            Thread.Sleep(1000);
            m_oWorker.ReportProgress(cnt);

            //If cancel button was pressed while the execution is in progress
            //Change the state from cancellation ---> cancel'ed
            if (m_oWorker.CancellationPending)
            {
                e.Cancel = true;
                m_oWorker.ReportProgress(0);
                return;
            }

            cnt++;
        }

        //Report 100% completion on operation completed
        m_oWorker.ReportProgress(100);
    }

或者是他们在c＃中使用线程的另一种方式？

因为当我在主要使用Thread.sleep方法时gui冻结!!

Answer 1

WebBrowser不喜欢从其他线程访问。尝试将其传递给RunWorkerAsync（），如下所示：

{{:key}}
{{:#key}}
{{:#parent.key}}
{{:#parent.parent.key}}
{{:~root.key}}

在c＃中使用webbrowser和线程时出现InvalidCastException

1 个答案: