.NET Framework 接收BeforeNavigate2事件BUG的替代方法

[.NET Framework 接收BeforeNavigate2事件BUG的替代方法]

????這是一篇微軟網絡上找到的文章，現在也許不適用了，但如果仍用.NET Framework 1.0，則只有這個方法可以解決這個問題了。


Liju Thomas [@online.microsoft.com]
Regarding BeforeNavigate2 it a bug as mentioned in the KB article.
But you can connect directly to IWebBrowserEvents (NOT IWebBrowserEvents2)
and sink to the BeforeNavigate event.

sample code:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Data;
using SHDocVw;

namespace InetTest
{
????///
????/// Summary description for Form1.
????///
????public class Form1 : System.Windows.Forms.Form, DWebBrowserEvents
????{
????????private AxSHDocVw.AxWebBrowser axWebBrowser1;
????????private System.Windows.Forms.Button button1;
????????private System.Windows.Forms.Label label1;
????????private UCOMIConnectionPoint icp;
????????private int cookie = -1;

????????///
????????/// Required designer variable.
????????///
????????private System.ComponentModel.Container components = null;
????????private Object obj;
????????public Form1()
????????{
????????????//
????????????// Required for Windows Form Designer support
????????????//
????????????InitializeComponent();

????????????// Sink to webbrowser events
????????????UCOMIConnectionPointContainer icpc =
????????????????(UCOMIConnectionPointContainer)axWebBrowser1.GetOcx();

????????????Guid g = typeof(DWebBrowserEvents).GUID;
????????????icpc.FindConnectionPoint(ref g, out icp);
????????????icp.Advise(this, out cookie);
????????}
????????///
????????/// Clean up any resources being used.
????????///
????????protected override void Dispose( bool disposing
????????{
????????????if( disposing
????????????{
????????????????// Release event sink
????????????????if (-1 != cookie) icp.Unadvise(cookie);
????????????????cookie = -1;

????????????????if (components != null)
????????????????{
????????????????????components.Dispose();
????????????????}
????????????}
????????????base.Dispose( disposing ;
????????}
#region Windows Form Designer generated code
????????///
????????/// Required method for Designer support - do not modify
????????/// the contents of this method with the code editor.
????????///
????????private void InitializeComponent()
????????{
????????????System.Resources.ResourceManager resources = new
System.Resources.ResourceManager(typeof(Form1));
????????????this.axWebBrowser1 = new AxSHDocVw.AxWebBrowser();
????????????this.button1 = new System.Windows.Forms.Button();
????????????this.label1 = new System.Windows.Forms.Label();
????????????
((System.ComponentModel.ISupportInitialize)(this.axWebBrowser1)).BeginInit()
;
????????????this.SuspendLayout();
????????????//
????????????// axWebBrowser1
????????????//
????????????this.axWebBrowser1.Enabled = true;
????????????this.axWebBrowser1.Location = new System.Drawing.Point(16, 8);
????????????this.axWebBrowser1.OcxState =
((System.Windows.Forms.AxHost.State)(resources.GetObject("axWebBrowser1.OcxS
tate"));
????????????this.axWebBrowser1.Size = new System.Drawing.Size(456, 208);
????????????this.axWebBrowser1.TabIndex = 0;
????????????//
????????????// button1
????????????//
????????????this.button1.Location = new System.Drawing.Point(16, 232);
????????????this.button1.Name = "button1";
????????????this.button1.TabIndex = 1;
????????????this.button1.Text = "button1";
????????????this.button1.Click += new System.EventHandler(this.button1_Click);
????????????//
????????????// label1
????????????//
????????????this.label1.Location = new System.Drawing.Point(112, 232);
????????????this.label1.Name = "label1";
????????????this.label1.Size = new System.Drawing.Size(344, 23);
????????????this.label1.TabIndex = 2;
????????????this.label1.Text = "label1";
????????????//
????????????// Form1
????????????//
????????????this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
????????????this.ClientSize = new System.Drawing.Size(480, 273);
????????????this.Controls.AddRange(new System.Windows.Forms.Control[] {
???????????????????????????????????????????????????????????????????????? this.label1,
???????????????????????????????????????????????????????????????????????? this.button1,
???????????????????????????????????????????????????????????????????????? this.axWebBrowser1});
????????????this.Name = "Form1";
????????????this.Text = "Form1";
????????????
((System.ComponentModel.ISupportInitialize)(this.axWebBrowser1)).EndInit();
????????????this.ResumeLayout(false);

????????}
#endregion

????????// DWebBrowserEvents Implementation
????????public void BeforeNavigate(string url, int flags,
????????????string targetFrameName, ref object postData,
????????????string headers, ref bool cancel)
????????{
????????????label1.Text = "BeforeNavigate to " + url;
????????}
????????public void NavigateComplete(string url) { }
????????public void StatusTextChange(string text) { }
????????public void ProgressChange(int progress, int progressMax) { }
????????public void DownloadComplete() { }
????????public void CommandStateChange(int command, bool enable) { }
????????public void DownloadBegin() { }
????????public void NewWindow(string url, int flags, string targetFrameName, ref
object postData, string headers, ref bool processed) { }
????????public void TitleChange(string text) { }
????????public void FrameBeforeNavigate(string url, int flags, string
targetFrameName, ref object postData, string headers, ref bool cancel) { }
????????public void FrameNavigateComplete(string url) { }
????????public void FrameNewWindow(string url, int flags, string targetFrameName,
ref object postData, string headers, ref bool processed) { }
????????public void Quit(ref bool Cancel) { }
????????public void WindowMove() { }
????????public void WindowResize() { }
????????public void WindowActivate() { }
????????public void PropertyChange(string property) { }

????????///
????????/// The main entry point for the application.
????????///
????????[STAThread]
????????static void Main()
????????{
????????????Application.Run(new Form1());
????????}

????????private void button1_Click(object sender, System.EventArgs e)
????????{
????????????axWebBrowser1.Navigate ("www.msn.com", ref obj, ref obj, ref obj, ref
obj);
????????}
????}
}

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