/// <summary>
/// This function is used to zoom web browser's content.
/// </summary>
/// <param name="webbrowser">The instance of web browser.</param>
/// <param name="zoom">The zoom scale. It should be 50~400</param>
/// <remarks>This function must be invoked after the webbrowser has completely loaded the URI.</remarks>
static void SetZoom(System.Windows.Controls.WebBrowser webbrowser, int zoom)
{
try
{
if (null == webbrowser)
{
return;
}
FieldInfo fiComWebBrowser = webbrowser.GetType().GetField(
"_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic);
if (null != fiComWebBrowser)
{
Object objComWebBrowser = fiComWebBrowser.GetValue(webbrowser);
if (null != objComWebBrowser)
{
object[] args = new object[]
{
OLECMDID_OPTICAL_ZOOM,
OLECMDEXECOPT_DODEFAULT,
zoom,
IntPtr.Zero
};
objComWebBrowser.GetType().InvokeMember(
"ExecWB",
BindingFlags.InvokeMethod,
null, objComWebBrowser,
args);
}
}
}
catch {}
}
public static void SetZoom(this System.Windows.Controls.WebBrowser wb, int zoom)
{
try
{
FieldInfo webBrowserInfo = wb.GetType().GetField("_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic);
object comWebBrowser = null;
object zoomPercent = zoom;
if (webBrowserInfo != null)
{
comWebBrowser = webBrowserInfo.GetValue(wb);
}
if (comWebBrowser != null)
{
InternetExplorer ie = (InternetExplorer)comWebBrowser;
ie.ExecWB(OLECMDID.OLECMDID_OPTICAL_ZOOM, OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref zoomPercent, IntPtr.Zero);
if (wb.Document is mshtml.HTMLDocument htmlDoc)
{
htmlDoc.parentWindow.scrollTo(0, 0);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}