Web浏览器用于处理应用程序中的弹出窗口

Question

我正在尝试使用WebBrowser控件为弹出窗口启动一个新窗体，而不是在IE中打开它。我试图使用AxWebBrowser来获取适用于NewWindow3事件并且只执行e.ppDisp = AxWebBrowser.Application的弹出窗口，但是AxWebBrowser有许多限制。因此，我试图扩展普通的WebBrowser以包含像AxWebBrowser一样的NewWindow3事件但遇到问题。使用e.ppDisp = AxWebBrowser.Application我收到错误：“检测到InvalidVariant”，如果我继续，则“指定的OLE变体无效”。

注意：这是我第一次扩展课程，所以我可能会看起来很简单。如果我尝试在新窗口中导航到新URL，我会从站点获得java脚本错误。

我已根据评论更新了代码库。已经删除了ExtendedWebBrowser类，以获得更小更好的版本。这是新法典：

从主窗体和非常相似的BrowserPopup表单 -

Protected Overrides Sub OnLoad(ByVal e As EventArgs)
    MyBase.OnLoad(e)
    nativeBrowser = DirectCast(ExtendedWebBrowser1.ActiveXInstance, SHDocVw.WebBrowser)
    AddHandler nativeBrowser.NewWindow3, AddressOf nativeBrowser_NewWindow3
    AddHandler nativeBrowser.WindowClosing, AddressOf nativeBrowser_WindowClosing
End Sub

Private Sub nativeBrowser_NewWindow3(ByRef ppDisp As Object, ByRef Cancel As Boolean, ByVal dwflags As UInteger, ByVal bStrUrlContext As String, ByVal bstrUrl As String)
    Dim popup = New BrowserPopup()
    popup.Show(Me)
    popup.browserPop.DocumentText = bStrUrlContext
    ppDisp = popup.browserPop.ActiveXInstance
End Sub

Private Sub nativeBrowser_WindowClosing(ByVal IsChildWindow As Boolean, ByRef Cancel As Boolean)
    MsgBox("working?") '<<<Doesn't Trigger>>>
End Sub

Protected Overrides Sub OnFormClosing(ByVal e As FormClosingEventArgs)
    MyBase.OnFormClosing(e)
End Sub

此外，如果它有帮助，这里是应该能够关闭弹出窗体的页面脚本，但似乎只是停用了WebBrowser。

<table isListBtn="false" cellpadding="0" enabled="true" class="buttonBorderBlue"
cellspacing="0" border="0" onClick="if (typeof(workpaneMediator_toolbar)!='undefined')
workpaneMediator_toolbar.onSelect('CANCEL_ACTION', this)"
actionType="CLOSE_WINDOW_TYPE" id="workpaneMediator_toolbar_CANCEL_ACTIONWrapper"
nowrap><tr><td class="buttonBlueTD">

Answer 1

对于Winforms WindowClosing控件，WebBrowser没有被解雇是对的，我确认了。它似乎是.NET WebBrowser ActiveX托管代码中的一个长期错误，它从未得到解决。请查看this post以获取更多详细信息和可能的解决方法。

另一种可能的解决方法可能是直接通过AxHost类托管WebBrowser ActiveX控件，在这种情况下WindowClosing会正确触发。例如：

<强> C＃：

using Microsoft.Win32;
using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WebBrowserApp
{
    // MainForm

    public partial class MainForm : Form 
    {
        WebBrowser webBrowser;

        public MainForm()
        {
            InitializeComponent();
            InitBrowser();

            if (this.webBrowser.Document == null && this.webBrowser.ActiveXInstance == null)
                throw new ApplicationException ("Unable to initialize WebBrowser ActiveX control.");

            var ax = (SHDocVw.WebBrowser)this.webBrowser.ActiveXInstance;
            ax.NewWindow2 += (ref object ppDisp, ref bool Cancel) =>
            {
                var popup = new RawBrowserPopup();
                popup.Visible = true;
                ppDisp = popup.WebBrowser.ActiveXInstance;
            };

            this.Load += (s, e) =>
            {
                this.webBrowser.DocumentText = "<a target=\"_blank\" href=\"javascript:'<button onclick=\\'window.close()\\'>Close</button>'\">Go</a>";
            };
        }

        // create a WebBrowser instance
        void InitBrowser()
        {
            this.webBrowser = new WebBrowser();
            this.webBrowser.Dock = DockStyle.Fill;
            this.Controls.Add(this.webBrowser);
            this.webBrowser.Visible = true;
        }
    }

    // RawWebBrowser

    public class RawWebBrowser : AxHost
    {
        public RawWebBrowser()
            : base("8856f961-340a-11d0-a96b-00c04fd705a2")
        {
        }

        public event EventHandler Initialized;

        protected override void AttachInterfaces()
        {
            if (this.Initialized != null)
                this.Initialized(this, new EventArgs());
        }

        public object ActiveXInstance
        {
            get
            {
                return base.GetOcx();
            }
        }
    }

    // RawBrowserPopup

    public class RawBrowserPopup : Form
    {
        RawWebBrowser webBrowser;

        public RawWebBrowser WebBrowser
        {
            get { return this.webBrowser; }
        }

        public RawBrowserPopup()
        {
            this.webBrowser = new RawWebBrowser();

            this.webBrowser.Initialized += (s, e) =>
            {
                var ax = (SHDocVw.WebBrowser)this.webBrowser.ActiveXInstance;
                ax.NewWindow2 += (ref object ppDisp, ref bool Cancel) =>
                {
                    var popup = new RawBrowserPopup();
                    popup.Visible = true;
                    ppDisp = popup.WebBrowser.ActiveXInstance;
                };

                ax.WindowClosing += (bool IsChildWindow, ref bool Cancel) =>
                {
                    Cancel = true;
                    this.Close();
                };
            };

            this.webBrowser.Dock = DockStyle.Fill;
            this.Controls.Add(this.webBrowser);
            this.webBrowser.Visible = true;
        }
    }
}

<强> VB.NET：

Public Class Form1
    Dim webBrowser As WebBrowser = New WebBrowser()

    Sub New()
        MyBase.New()
        Me.InitializeComponent()
        webBrowser.Dock = DockStyle.Fill
        Me.Controls.Add(webBrowser)
        webBrowser.Visible = True
    End Sub

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Me.webBrowser.DocumentText = "<a target='_blank' href='javascript:""<button onclick=\""window.close()\"">Close</button>""'>Go</a>"

        Dim ActiveX As SHDocVw.WebBrowser = Me.webBrowser.ActiveXInstance
        AddHandler ActiveX.NewWindow2, AddressOf WebBrowser_ActiveX_NewWindow2
    End Sub

    Private Sub WebBrowser_ActiveX_NewWindow2(ByRef ppDisp As Object, ByRef Cancel As Boolean)
        Dim popup As RawBrowserPopup = New RawBrowserPopup()
        popup.Visible = True
        ppDisp = popup.WebBrowser.ActiveXInstance
    End Sub
End Class

Public Class RawWebBrowser
    Inherits System.Windows.Forms.AxHost

    Sub New()
        MyBase.New("8856f961-340a-11d0-a96b-00c04fd705a2")
    End Sub

    Event Initialized(sender As Object, e As EventArgs)

    Protected Overrides Sub AttachInterfaces()
        RaiseEvent Initialized(Me, New EventArgs())
    End Sub

    Public ReadOnly Property ActiveXInstance() As Object
        Get
            Return MyBase.GetOcx()
        End Get
    End Property
End Class

Public Class RawBrowserPopup
    Inherits System.Windows.Forms.Form

    Dim WithEvents rawBrowser As RawWebBrowser = New RawWebBrowser()

    Sub New()
        MyBase.New()
        rawBrowser.Dock = DockStyle.Fill
        Me.Controls.Add(rawBrowser)
        rawBrowser.Visible = True
    End Sub

    Public ReadOnly Property WebBrowser() As Object
        Get
            Return rawBrowser
        End Get
    End Property

    Private Sub rawBrowser_Initialized(sender As Object, e As EventArgs) Handles rawBrowser.Initialized
        Dim activeX As SHDocVw.WebBrowser = rawBrowser.ActiveXInstance
        AddHandler activeX.NewWindow2, AddressOf activeX_NewWindow2
        AddHandler activeX.WindowClosing, AddressOf activeX_WindowClosing
    End Sub

    Private Sub activeX_NewWindow2(ByRef ppDisp As Object, ByRef Cancel As Boolean)
        Dim popup As RawBrowserPopup = New RawBrowserPopup()
        popup.Visible = True
        ppDisp = popup.WebBrowser.ActiveXInstance
    End Sub

    Private Sub activeX_WindowClosing(IsChildWindow As Boolean, ByRef Cancel As Boolean)
        Cancel = True
        Me.Close()
    End Sub

End Class