从 WebBrowser 控件以横向模式打印？

System.Windows.Forms.WebBrowser wb = new System.Windows.Forms.WebBrowser();

wb.DocumentStream = new FileStream("C:\a.html", FileMode.Open, FileAccess.Read);
while (wb.ReadyState != WebBrowserReadyState.Complete)
{
    Application.DoEvents();
}
wb.Print();

我知道如何从 PrinterDocument 对象设置页面方向，但不知道如何从 WebBrowser 对象设置页面方向。有办法做到这一点吗？谢谢！

首先，我建议您使用异步事件模型：

wb.DocumentCompleted += wb_DocumentCompleted;

private void wb_DocumentCompleted (object sender, WebBrowserDocumentCompletedEventArgs e)
{
    ((WebBrowser)sender).Print();
}

打印（添加参考Microsoft.mshtml.dll):

mshtml.IHTMLDocument2 doc = wb.Document.DomDocument as mshtml.IHTMLDocument2;
doc.execCommand("print", showUI, templatePath);

See IHTMLDocument2.execCommand http://msdn.microsoft.com/en-us/library/aa752577%28VS.85%29.aspx, MSDN论坛问题 http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/e3aab4dd-125d-4c2f-98ac-3f0f25d357f2并点击链接。