如何在C＃线程中读取Cookie文件

Question

I have this function for reading cookie files in C#:

private void getdocument()
{
 while (true)
 {
 MessageBox.Show(webBrowser1.Document.Cookie);
 }
}

I am invoking it like this:

private void Form1_Load(object sender, EventArgs e)
{
 Thread MyThread = new Thread(new ThreadStart(getdocument));
 MyThread.Start();
}

But I'm getting an error:

System.InvalidCastException was unhandled

Specified cast is not valid.

How to fix this?

Answer 1

As you can see in Object Hierarchy structure WebBrowser is inherited from System.Windows.Forms.Control , so you need to you it from the thread it was created on.

Fix :

private void getdocument()
{
    while (true)
    {

        this.Invoke((MethodInvoker) delegate
            {
                MessageBox.Show(webBrowser1.Document.Cookie);
            });
    }
}