using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
        }
         //自定义线程
        System.Threading.Thread x;
        delegate void CallBackPro(string url);
        private void Form1_Load(object sender, EventArgs e)
        {

        }

        public void ThreadPro()
        {
            SafeThreadProc("www.baidu.com");
        }

        private void SafeThreadProc(string  url)
        {
            if (this.webBrowser1.InvokeRequired)
            {
                CallBackPro stdv = new CallBackPro(SafeThreadProc);
                this.Invoke(stdv, new object[] { url });
            }
            else
            {
                this.webBrowser1.Navigate(url);
                MessageBox.Show(webBrowser1.ReadyState.ToString());
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            x = new System.Threading.Thread(new System.Threading.ThreadStart(this.ThreadPro));
            x.Start();
        }
    }
}
按第一次是uninitialed  等网页加载再按就是Loadeing
还不会吗。。。我看到你两次了