WebBrowser拦截网页Alter消息

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.Runtime.InteropServices;
using System.Runtime.CompilerServices;

namespace WindowsFormsApplication7
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

MyWebBrowser MyWebBrowser1 = new MyWebBrowser();

private void Form1_Load(object sender, EventArgs e)
{
this.Controls.Add(MyWebBrowser1);
MyWebBrowser1.Visible = true;
MyWebBrowser1.Navigate("about:blank");
MyWebBrowser1.Document.Write("<mce:script type="text/javascript"><!--
alert('我就是确定按钮啊')
// --></mce:script>");

}

}

public class MyWebBrowser : WebBrowser
{
#region ExtendedWebBrowserSite
class ExtendedWebBrowserSite : WebBrowser.WebBrowserSite, UnsafeNativeMethods.IDocHostShowUI
{
public ExtendedWebBrowserSite(WebBrowser host)
: base(host)
{
}

void UnsafeNativeMethods.IDocHostShowUI.ShowMessage(ref UnsafeNativeMethods._RemotableHandle hwnd, string lpstrText, string lpstrCaption, uint dwType, string lpstrHelpFile, uint dwHelpContext, out int plResult)
{
plResult = 0;
if (lpstrText == "我就是确定按钮啊")
{
if (MessageBox.Show("是否要屏蔽Alert对话框", "提示", MessageBoxButtons.YesNo) == DialogResult.No)
{
MessageBox.Show(lpstrText, lpstrCaption);
}
}
}

void UnsafeNativeMethods.IDocHostShowUI.ShowHelp(ref UnsafeNativeMethods._RemotableHandle hwnd, string pszHelpFile, uint uCommand, uint dwData, UnsafeNativeMethods.tagPOINT ptMouse, object pDispatchObjectHit)
{
}
}

protected override WebBrowserSiteBase CreateWebBrowserSiteBase()
{
return new ExtendedWebBrowserSite(this);
}
#endregion
}

public class UnsafeNativeMethods
{
#region IDocHostShowUI
[StructLayout(LayoutKind.Explicit, Pack = 4)]
public struct __MIDL_IWinTypes_0009
{
// Fields
[FieldOffset(0)]
public int hInproc;
[FieldOffset(0)]
public int hRemote;
}

[StructLayout(LayoutKind.Sequential, Pack = 4)]
public struct _RemotableHandle
{
public int fContext;
public __MIDL_IWinTypes_0009 u;
}

[StructLayout(LayoutKind.Sequential, Pack = 4)]
public struct tagPOINT
{
public int x;
public int y;
}

[ComImport, Guid("C4D244B0-D43E-11CF-893B-00AA00BDCE1A"), InterfaceType((short)1)]
public interface IDocHostShowUI
{
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void ShowMessage([In, ComAliasName("ExtendedWebBrowser2.UnsafeNativeMethods.wireHWND")] ref _RemotableHandle hwnd, [In, MarshalAs(UnmanagedType.LPWStr)] string lpstrText, [In, MarshalAs(UnmanagedType.LPWStr)] string lpstrCaption, [In] uint dwType, [In, MarshalAs(UnmanagedType.LPWStr)] string lpstrHelpFile, [In] uint dwHelpContext, [ComAliasName("ExtendedWebBrowser2.UnsafeNativeMethods.LONG_PTR")] out int plResult);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void ShowHelp([In, ComAliasName("ExtendedWebBrowser2.UnsafeNativeMethods.wireHWND")] ref _RemotableHandle hwnd, [In, MarshalAs(UnmanagedType.LPWStr)] string pszHelpFile, [In] uint uCommand, [In] uint dwData, [In] tagPOINT ptMouse, [Out, MarshalAs(UnmanagedType.IDispatch)] object pDispatchObjectHit);
}
#endregion

}

}