C#封装WebBrowser时NewWindow事件无法获取Url的解决方法
一,重写WebBrowser组件,禁止跳转到IE新窗口。菜单“项目->添加类”,在模板中的“类”图标上确认一下,然后名称改为“ExtendedWebBrowser.cs”。
二,在右边解决方案管理器中右击“查看代码”,然后在ExtendedWebBrowser.cs代码窗口将代码修改成如下:
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[设计]窗口,在菜单“生成”中,点“生成解决方案”。一会之后在工具箱的最上方就会出现一个新的组件“ExtendedWebBrowser”,这正是我们需要的,hehe。
四、回到Form1.cs[设计]窗口,把ExtendedWebBrowser拖进来。
(一)在属性窗口里调整好Anchor,使之能最大化。
(二)双击“ScriptErrorSuppressed”,将之属性改为“True”以禁用所有的对话框,比如提示Activex下载、执行以及安全登录等对话框。当然可以参考MSDN上的代码示例,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的事件里双击“BeforeNewWindow”并添加代码:
private void extendedWebBrowser2_BeforeNewWindow(object sender, EventArgs e) { WebBrowserExtendedNavigatingEventArgs eventArgs = e as WebBrowserExtendedNavigatingEventArgs; eventArgs.Cancel = true; ((ExtendedWebBrowser)sender).Navigate(eventArgs.Url); }