介绍
WebBrowsers可以让我们在窗体中进行导航网页。
WebBrowser控件内部使用ie的引擎,因此使用WebBrowser我们必须安装ie浏览器(windows默认安装的)。
使用
直接在xmal中使用webBrowser控件
<WebBrowser x:Name="WebBrowser1" Source ="xxx.com"></WebBrowser>
其中Source熟悉可以将webBrowser控件指向一个网页(也可以是本地文件的绝对路径)
除了使用Source属性还有以下方法进行导航:
问题
- js报错
默认情况下webBrowser用的是比较低的ie内核,这样如果访问的网页有不支持的脚本或者其他问题,就会没有办法正常运行,比如报错 javaScript错误。某些情况下使用ie可以打开的网页,在webBrowser需要管理员权限才可以正常打开,没有管理员权限也会报jabaScript错误。所以一般使用winForm的webBrowser,方便扩展,并且资料多。- 避免报错不弹提示框。
WebBrowser1.Navigated += (sender, args) =>
{
SetSilent(wbMain, true)
}
public static void SetSilent(WebBrowser browser, bool silent)
{
if (browser == null)
throw new ArgumentNullException("browser");
// get an IWebBrowser2 from the document
IOleServiceProvider sp = browser.Document as IOleServiceProvider;
if (sp != null)
{
Guid IID_IWebBrowserApp = new Guid("0002DF05-0000-0000-C000-000000000046");
Guid IID_IWebBrowser2 = new Guid("D30C1661-CDAF-11d0-8A3E-00C04FC9E26E");
object webBrowser;
sp.QueryService(ref IID_IWebBrowserApp, ref IID_IWebBrowser2, out webBrowser);
if (webBrowser != null)
{
webBrowser.GetType().InvokeMember("Silent", BindingFlags.Instance | BindingFlags.Public | BindingFlags.PutDispProperty, null, webBrowser, new object[] { silent });
}
}
}
[ComImport, Guid("6D5140C1-7436-11CE-8034-00AA006009FA"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IOleServiceProvider
{
[PreserveSig]
int QueryService([In] ref Guid guidService, [In] ref Guid riid, [MarshalAs(UnmanagedType.IDispatch)] out object ppvObject);
}
这种只是让它不出现报错窗口,不能从根本上解决。
- 修改注册表使用新的ie内核,下面是代码:
static void SetWebBrowserFeatures(int ieVersion)
{
if (LicenseManager.UsageMode != LicenseUsageMode.Runtime)
return;
var appName = System.IO.Path.GetFileName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName);
UInt32 ieMode = GeoEmulationModee(ieVersion);
var featureControlRegKey = @"HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\";
Registry.SetValue(featureControlRegKey + "FEATURE_BROWSER_EMULATION",
appName, ieMode, RegistryValueKind.DWord);
Registry.SetValue(featureControlRegKey + "FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION",
appName, 1, RegistryValueKind.DWord);
}
static UInt32 GeoEmulationModee(int browserVersion)
{
UInt32 mode = 11000; // Internet Explorer 11. Webpages containing standards-based !DOCTYPE directives are displayed in IE11 Standards mode.
switch (browserVersion)
{
case 7:
mode = 7000; // Webpages containing standards-based !DOCTYPE directives are displayed in IE7 Standards mode.
break;
case 8:
mode = 8000; // Webpages containing standards-based !DOCTYPE directives are displayed in IE8 mode.
break;
case 9:
mode = 9000; // Internet Explorer 9. Webpages containing standards-based !DOCTYPE directives are displayed in IE9 mode.
break;
case 10:
mode = 10000; // Internet Explorer 10.
break;
case 11:
mode = 11000; // Internet Explorer 11
break;
}
return mode;
}
比如你想使用最新的IE11
SetWebBrowserFeatures(11);
在网页中强制以ie最高级别的可用模式显示内容
<meta http-equiv="X-UA-Compatible" content="edge" />
内存泄漏的解决方式
Memory leak when using WPF WebBrowser control in multiple windows
- 将WebBrowser放到子进程中,每次开关都会重新分配内存
- 删除掉所有引用,来清理内存泄漏。关闭窗口时调用下面代码。
public void Dispose()
{
webBrowser.Dispose();
var window = GetWindowElement(webBrowser);
if (window == null)
return;
var field = typeof(Window).GetField("_swh", BindingFlags.NonPublic | BindingFlags.Instance);
var valueSwh = field.GetValue(window);
var valueSourceWindow = valueSwh.GetType().GetField("_sourceWindow", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(valueSwh);
var valuekeyboardInput = valueSourceWindow.GetType().GetField("_keyboardInputSinkChildren", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(valueSourceWindow);
var inputSites = valuekeyboardInput as IEnumerable<IKeyboardInputSite>;
if (inputSites == null)
return;
var currentSite = inputSites.FirstOrDefault(s => ReferenceEquals(s.Sink, webBrowser));
if (currentSite != null)
currentSite.Unregister();
}
private static Window GetWindowElement(DependencyObject element)
{
while (element != null && !(element is Window))
{
element = VisualTreeHelper.GetParent(element);
}
return element as Window;
}