WPF WebBrowser控件放大/缩小支持？

WPF WebBrowser control zoom in/out support?

对于WPF WebBrowser控件，是否可以复制Internet Explorer的缩放功能？

换句话说，Internet Explorer具有菜单"视图">"缩放">" 75％"，该菜单以75％的比例显示网页。有没有办法使嵌入在WPF应用程序中的Web浏览器控件执行相同的操作？

我看过这篇文章：
WPF WebBrowser-如何缩放内容？

但是它似乎只能缩放页面，而不能缩放页面内容。

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public partial class TestWindow: UserControl
{
public TestWindow()
{
InitializeComponent();

browser.LoadCompleted += new LoadCompletedEventHandler(browser_LoadCompleted);
}

private void browser_LoadCompleted(object sender, NavigationEventArgs e)
{
try
{

FieldInfo webBrowserInfo = browser.GetType().GetField("_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic);

object comWebBrowser = null;
object zoomPercent = 120;
if (webBrowserInfo != null)
comWebBrowser = webBrowserInfo.GetValue(browser);
if (comWebBrowser != null)
{
InternetExplorer ie = (InternetExplorer)comWebBrowser;
ie.ExecWB(SHDocVw.OLECMDID.OLECMDID_OPTICAL_ZOOM, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref zoomPercent, IntPtr.Zero);
}
}
catch (Exception ex)
{
}
}

public void SetBrowser(string url)
{
browser.Navigate(url,null,null,null);

}

internal void Destroy()
{
try
{
if (browser.Parent != null)
{
((Grid)browser.Parent).Children.Remove(browser);
browser.Navigate("about:blank");
browser.Dispose();
browser = null;
}
}
catch { }

}

}

相关讨论

这是我的做法：

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// Needed to expose the WebBrowser's underlying ActiveX control for zoom functionality
[ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
[Guid("6d5140c1-7436-11ce-8034-00aa006009fa")]
internal interface IServiceProvider
{
[return: MarshalAs(UnmanagedType.IUnknown)]
object QueryService(ref Guid guidService, ref Guid riid);
}
static readonly Guid SID_SWebBrowserApp = new Guid("0002DF05-0000-0000-C000-000000000046");

private void ZoomListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
object zoomPercent; // A VT_I4 percentage ranging from 10% to 1000%
switch(ZoomListBox.SelectedItem.ToString())
{
case"System.Windows.Controls.ListBoxItem: 200%":
zoomPercent = 200;
break;
case"System.Windows.Controls.ListBoxItem: 100%":
zoomPercent = 100;
break;
case"System.Windows.Controls.ListBoxItem: 50%":
zoomPercent = 50;
break;
default:
zoomPercent = 100;
break;
}

// grab a handle to the underlying ActiveX object
IServiceProvider serviceProvider = null;
if (m_webView.Document != null)
{
serviceProvider = (IServiceProvider)m_webView.Document;
}
Guid serviceGuid = SID_SWebBrowserApp;
Guid iid = typeof(SHDocVw.IWebBrowser2).GUID;
SHDocVw.IWebBrowser2 browserInst = (SHDocVw.IWebBrowser2)serviceProvider.QueryService(ref serviceGuid, ref iid);

// send the zoom command to the ActiveX object
browserInst.ExecWB(SHDocVw.OLECMDID.OLECMDID_OPTICAL_ZOOM, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref zoomPercent, IntPtr.Zero);
}

由于WPF WebBrowser控件不会直接公开ActiveX，因此所有服务提供者的资料都公开了ActiveX。除此之外，它与alexei的解决方案几乎相同。