C# webBrowser禁止在新窗口打开，强制在本窗口打开

来源：互联网发布：数据酋长刊登工具编辑：程序博客网时间：2024/05/06 03:44

进行webBrower开发的时候，肯定都会遇到一个问题。
那就是怎么样强制在本窗口打开新窗口的问题。
网上最常见的解决方法就是，
在NewWindow事件中取得要打开的网址，取消打开新窗口，然后在本窗口打开要转向的网址

private void webBrowser_1_NewWindow(object sender, CancelEventArgs e)
{
WebBrowser webBrowser_temp = (WebBrowser)sender;
string newUrl = webBrowser_temp.Document.ActiveElement.GetAttribute("href");
webBrowser_1.Url = new Uri(newUrl);
e.Cancel = true;
}

虽然这种方法能够解决大部分的要求，但是治标不治本。
而且当网址里面还有汉字的时候就更加麻烦了，比如在百度MP3，歌曲名字都是汉字，和百度空间里面，大部分用户名都是汉字，所以取的网址都用乱码。虽然，可以对网址进行编码，但是并不是所有网页都是uft-8编码，对于如何得知网页的编码又是一个课题了。

最根本的方法就是重写了。
新建一个类

using System;
using System.Collections.Generic;
using System.Text;
namespace webTestRecorder
{
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;
public string Url
{
get { return _Url; }
}
private string _Frame;
public string Frame
{
get { return _Frame; }
}
public WebBrowserExtendedNavigatingEventArgs(string url, string frame)
: base()
{
_Url = url;
_Frame = frame;
}
}
}

然后把webBrowser换成我们重写的ExtendedWebBrowser，添加事件处理

ieBrowser = new ExtendedWebBrowser();
ieBrowser.BeforeNewWindow += new EventHandler<WebBrowserExtendedNavigatingEventArgs>(ieBrowser_BeforeNewWindow);

然后在其BeforeNewWindow事件中：

void ieBrowser_BeforeNewWindow(object sender, WebBrowserExtendedNavigatingEventArgs e)
{
e.Cancel=true;
((ExtendedWebBrowser)sender).Navigate(e.Url);
}