Printing Background Colors from WPF WebBrowser

问题

Currently, I'm printing the contents of a WPF WebBrowser like so:

mshtml.IHTMLDocument2 doc = WebBrowser.Document as mshtml.IHTMLDocument2;
doc.execCommand("Print", true, null);

My HTML content has tables with background colors. Currently, when I print the content, the background colors do not print -- everything is solid white. Is there a way to tell the WebBrowser to print the background colors as well?

Also, this still causes a print dialog to pop up. Does anyone know what the command is to print the contents dialog-less?

Thanks a lot!

回答1:

Assuming you're using 'SHDocVw.WebBrowser', you can use the ExecWB command. To print without the dialog, use the OLECMDEXECOPT_PROMPTUSER (1) constant. You can also pass an IE print template (just an HTML file) for more control over how the page is displayed.

It's something like this (taken from this MSDN question)

browser.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINT,
               SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, 
               "print_template.html", ref nullObject);

As for the background, it appears to be one of the options you can specify in the print template's LayoutRect. All print dialog settings are stored in the registry, but a print template is preferable because it won't change system-wide settings.

来源：https://stackoverflow.com/questions/6062949/printing-background-colors-from-wpf-webbrowser