C#重写WebBrowser组件,禁止跳转到IE新窗口、脚本错误
- <span style="font-family: Arial, Helvetica, sans-serif;"><a href="http://blog.chinaunix.net/uid-16242888-id-146885.html">原创地址</a>
- </span>
- <span style="font-family: Arial, Helvetica, sans-serif;">刚从delphi转到c#,一切重头开始。上来先做个myBrowser,结果发现无法解决跳转到新窗口问题。从网上找到奇客力大侠的《C# webBrowser禁止在新窗口打开,强制在本窗口打开》文章(http://blog.163.com/da7_1@126/blog/static/104072678201031651754880/),结果发现对重写WebBrowser一窍不通,折腾了2天,又找到百度知道里的一篇问答《在C#中如何重写控件》(http://zhidao.baidu.com/question/48991857.html?fr=qrl&cid=869&index=1&fr2=query),再几经周折才搞定。</span>
- <pre class="csharp" name="code">为了纪念第一个C#程序的艰难问世,现将过程详细记录如下:
- 一、在VS2008里用C#新建一个Windows窗体应用程序,起名为MyBrowser。
- 二、在里面添加Label、TextBox、Button,然后整成如下图的样式,同时把各个控件的Anchor和Text归整一下,位置和名称放放好。
-
- 三、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”。
- (一)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<WebBrowserExtendedNavigatingEventArgs> BeforeNavigate;
- public event EventHandler<WebBrowserExtendedNavigatingEventArgs> BeforeNewWindow;
- protected void OnBeforeNewWindow(string url, out bool cancel)
- {
- EventHandler<WebBrowserExtendedNavigatingEventArgs> 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<WebBrowserExtendedNavigatingEventArgs> 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;
- }
- }
- }
- (二)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。
- 三、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(http://apps.hi.baidu.com/share/detail/379735),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;
- }
- (三)在ExtendedWebBrowser的事件里双击“BeforeNewWindow”并添加2行代码:
- private void extendedWebBrowser1_BeforeNewWindow(object sender, MyBrowser.WebBrowserExtendedNavigatingEventArgs e)
- {
- e.Cancel=true;
- ((ExtendedWebBrowser)sender).Navigate(e.Url);
- }
- (四)最后一步,回到Form1.cs[设计]窗口,双击Button按钮,添加代码如下:
- private void button1_Click(object sender, EventArgs e)
- {
- extendedWebBrowser1.Navigate(textBox1.Text);
- }
-
- F5运行,点几个老跳的链接,oh~yeah,成功了!
- ,还有些不爽,输完网址后还要点登录,像IE一样敲一下回车就好了。说干就干
- (五)TextBox事件中,双击KeyPress(不要用Enter事件,试过不行),添加以下代码
-
- private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
- {
- if (e.KeyChar == (char)13)
- {
- button1_Click(null,null);
- }
- }</pre><br>
- <pre></pre>
- <pre></pre>
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