C#封裝WebBrowser時NewWindow事件無法取得Url的解決方法

Source: https://www.cnblogs.com/soundcode/p/13689579.html

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一，重寫WebBrowser元件，禁止跳到IE新視窗。選單“項目→新增類別”，在範本中的“類別”圖示上確認一下，然後名稱改為“ExtendedWebBrowser.cs”。

二，在右邊解決方案管理員中右鍵按“查看程式碼”，然後在ExtendedWebBrowser.cs程式碼視窗將程式碼修改成如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MyBrowser
{
    public class ExtendedWebBrowser : System.Windows.Forms.WebBrowser
    {
        System.Windows.Forms.AxHost.ConnectionPointCookie cookie;
        WebBrowserExtendedEvents events;
        //This method will be called to give you a chance to create your own event sink
        protected override void CreateSink()
        {
            //MAKE SURE TO CALL THE BASE or the normal events won't fire
            base.CreateSink();
            events = new WebBrowserExtendedEvents(this);
            cookie = new System.Windows.Forms.AxHost.ConnectionPointCookie(this.ActiveXInstance, events, typeof(DWebBrowserEvents2));
        }
        protected override void DetachSink()
        {
            if (null != cookie)
            {
                cookie.Disconnect();
                cookie = null;
            }
            base.DetachSink();
        }
        //This new event will fire when the page is navigating
        public event EventHandler BeforeNavigate;
        public event EventHandler BeforeNewWindow;
        protected void OnBeforeNewWindow(string url, out bool cancel)
        {
            EventHandler h = BeforeNewWindow;
            WebBrowserExtendedNavigatingEventArgs args = new WebBrowserExtendedNavigatingEventArgs(url, null);
            if (null != h)
            {
                h(this, args);
            }
            cancel = args.Cancel;
        }
        protected void OnBeforeNavigate(string url, string frame, out bool cancel)
        {
            EventHandler h = BeforeNavigate;
            WebBrowserExtendedNavigatingEventArgs args = new WebBrowserExtendedNavigatingEventArgs(url, frame);
            if (null != h)
            {
                h(this, args);
            }
            //Pass the cancellation chosen back out to the events
            cancel = args.Cancel;
        }
        //This class will capture events from the WebBrowser
        class WebBrowserExtendedEvents : System.Runtime.InteropServices.StandardOleMarshalObject, DWebBrowserEvents2
        {
            ExtendedWebBrowser _Browser;
            public WebBrowserExtendedEvents(ExtendedWebBrowser browser) { _Browser = browser; }
            //Implement whichever events you wish
            public void BeforeNavigate2(object pDisp, ref object URL, ref object flags, ref object targetFrameName, ref object postData, ref object headers, ref bool cancel)
            {
                _Browser.OnBeforeNavigate((string)URL, (string)targetFrameName, out cancel);
            }
            public void NewWindow3(object pDisp, ref bool cancel, ref object flags, ref object URLContext, ref object URL)
            {
                _Browser.OnBeforeNewWindow((string)URL, out cancel);
            }
        }
        [System.Runtime.InteropServices.ComImport(), System.Runtime.InteropServices.Guid("34A715A0-6587-11D0-924A-0020AFC7AC4D"),
        System.Runtime.InteropServices.InterfaceTypeAttribute(System.Runtime.InteropServices.ComInterfaceType.InterfaceIsIDispatch),
        System.Runtime.InteropServices.TypeLibType(System.Runtime.InteropServices.TypeLibTypeFlags.FHidden)]
        public interface DWebBrowserEvents2
        {
            [System.Runtime.InteropServices.DispId(250)]
            void BeforeNavigate2(
                [System.Runtime.InteropServices.In,
                System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.IDispatch)] object pDisp,
                [System.Runtime.InteropServices.In] ref object URL,
                [System.Runtime.InteropServices.In] ref object flags,
                [System.Runtime.InteropServices.In] ref object targetFrameName, [System.Runtime.InteropServices.In] ref object postData,
                [System.Runtime.InteropServices.In] ref object headers,
                [System.Runtime.InteropServices.In,
                System.Runtime.InteropServices.Out] ref bool cancel);
            [System.Runtime.InteropServices.DispId(273)]
            void NewWindow3(
                [System.Runtime.InteropServices.In,
                System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.IDispatch)] object pDisp,
                [System.Runtime.InteropServices.In, System.Runtime.InteropServices.Out] ref bool cancel,
                [System.Runtime.InteropServices.In] ref object flags,
                [System.Runtime.InteropServices.In] ref object URLContext,
                [System.Runtime.InteropServices.In] ref object URL);
        }
    }
    public class WebBrowserExtendedNavigatingEventArgs : System.ComponentModel.CancelEventArgs
    {
        private string _Url;   //原文此处多了一个空格，注意修改之...散仙闪电注
        public string Url
        {
            get { return _Url; }
        }
        private string _Frame;  //原文此处多了一个空格，注意修改之...散仙闪电注
        public string Frame
        {
            get { return _Frame; }
        }
        public WebBrowserExtendedNavigatingEventArgs(string url, string frame)
            : base()
        {
            _Url = url;
            _Frame = frame;
        }
    }
}

三，回到Form1.cs[設計]窗口，在選單「生成」中，點選「生成解決方案」。一會之後工具箱的最上方就會出現一個新的元件“ExtendedWebBrowser”，這正是我們需要的，hehe。
四、回到Form1.cs[設計]窗口，把ExtendedWebBrowser拖進來。
- (一)在屬性視窗裡調整好Anchor，使其能最大化。
- (二)雙擊“ScriptErrorSuppressed”，將之屬性改為“True”以停用所有的對話框，例如提示Activex下載、執行以及安全登入等對話框。當然可以參考MSDN上的程式碼範例，有的放矢:
- ```
private void browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    ((WebBrowser)sender).Document.Window.Error += new HtmlElementErrorEventHandler(Window_Error);
}
private void Window_Error(object sender, HtmlElementErrorEventArgs e)
{
    // Ignore the error and suppress the error dialog box.
    e.Handled = true;
}
```

五，在ExtendedWebBrowser的事件裡雙擊「BeforeNewWindow」並加入程式碼：

private void extendedWebBrowser2_BeforeNewWindow(object sender, EventArgs e)
{
    WebBrowserExtendedNavigatingEventArgs eventArgs = e as WebBrowserExtendedNavigatingEventArgs;
    eventArgs.Cancel = true;
    ((ExtendedWebBrowser)sender).Navigate(eventArgs.Url);
}

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C#封裝WebBrowser時NewWindow事件無法取得Url的解決方法

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