C#實現一個功能簡單的web瀏覽器

（1）建立一個windows應用表單，命名為web瀏覽器，並為改表單添加相應的控制項，如下：
 
（2）為相應的控制項添加相應的事件響應代碼，完整代碼如下：
using System; using System.Collections.Generic;
using System.ComponentModel; using System.Data;
using System.Drawing; using System.Text;
using System.Windows.Forms; using System.IO;
namespace Web瀏覽器
{
public partial class Form1 : Form
{
 public Form1()
{
 InitializeComponent();
 }
private void Navigate(string address)
{
if (String.IsNullOrEmpty(address))
return;
 if (address.Equals("about:blank")) return;
 if (!address.StartsWith("http://")) address = "http://" + address;
try {
Cursor.Current = Cursors.WaitCursor; webBrowser1.Navigate(new Uri(address));
}
catch (System.UriFormatException)
{ return; }
 finally { Cursor.Current = Cursors.Default; }
}
private void Form1_Load(object sender, EventArgs e)
{
toolStrip1.ImageList = imageList1;
 tbBack.ImageIndex = 0;
 tbForward.ImageIndex = 1;
 tbRefrash.ImageIndex = 2;
tbHome.ImageIndex = 3;
}
private void comboBox1_KeyDown(object sender, KeyEventArgs e)
{ if (e.KeyCode == Keys.Enter) {
Navigate(comboBox1.Text);
 comboBox1.Items.Add(comboBox1.Text);
}
}
private void tbBack_Click(object sender, EventArgs e)
{
 webBrowser1.GoBack();
}
private void tbForward_Click(object sender, EventArgs e)
{
    webBrowser1.GoForward();
 }
private void tbRefrash_Click(object sender, EventArgs e)
{
i  f (!webBrowser1.Url.Equals("about:blank"))
   {
webBrowser1.Refresh();
}
}
private void tbHome_Click(object sender, EventArgs e)
{
webBrowser1.GoHome();
 }
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
 {
Navigate(comboBox1.Text);
}
private void 開啟ToolStripMenuItem_Click(object sender, EventArgs e)
{
  openFileDialog1.ShowDialog();
  webBrowser1.DocumentText = File.ReadAllText(openFileDialog1.FileName,Encoding.GetEncodin("gb2312"));
}
private void 關閉ToolStripMenuItem_Click(object sender, EventArgs e)
{
   this.Close();
}
private void Form1_Resize(object sender, EventArgs e)
{
   webBrowser1.Width = this.Width - 25;
   webBrowser1.Height = this.Height - 130;
   comboBox1.Width = this.Width - 55;
}
private void toolStripButton1_Click(object sender, EventArgs e)
{
   webBrowser1.GoSearch();
}
}
}
（3）程式說明：本程式只是實現一個功能簡單的web瀏覽器效果，功能強大的web瀏覽器，正在製作中，目的給初學者一個，開拋磚引玉的作用。