winfrom的webBrowser从当前页面打开新的页面

以下代码，好像对于有嵌套行为的页面，无效，不过略作修改应该也能兼容所有情况：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace localindex
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            webBrowser1.ScriptErrorsSuppressed = true; //禁用错误脚本提示
            webBrowser1.IsWebBrowserContextMenuEnabled = false; // 禁用右键菜单
            webBrowser1.WebBrowserShortcutsEnabled = false; //禁用快捷键
            webBrowser1.AllowWebBrowserDrop = false; // 禁止文件拖动

            webBrowser1.Navigate(Application.StartupPath + @"\assets\index.html");
            webBrowser1.Document.Window.Error += Window_Error;
            webBrowser1.NewWindow += CancelEventHandler;
            webBrowser1.DocumentCompleted += webBrowser_DocumentCompleted;
        }

        private void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            foreach (HtmlElement archor in webBrowser1.Document.Links)
            {
                archor.SetAttribute("target", "_self");
            }

            foreach (HtmlElement form in webBrowser1.Document.Forms)
            {
                form.SetAttribute("target", "_self");
            }
        }

        private void Window_Error(object sender, HtmlElementErrorEventArgs e)
        {
            e.Handled = true;
        }

        //禁用新窗口打开
        public void CancelEventHandler(object sender, CancelEventArgs e)
        {
            //webBrowser1.StatusText 判断是否是url类
            //System.Diagnostics.Process.Start(webBrowser1.StatusText);
            e.Cancel = true;
        }
    }
}

webBrowser_DocumentCompleted里面讲页面调转的地方全部修改了标签模式。注意，CancelEventHandler中需要将e.Cancel = true;进行设置