如何打印WebBrowser控件的内容？

Question

我在这里找到了像这样使用的代码：

printDialog1.PrintDocument
(((IDocumentPaginatorSource)webBrowserMap.Document).DocumentPaginator, "Alchemy Map");

...但是我得到了两个错误信息，分别是：

0)'System.Windows.Forms.PrintDialog' does not contain a definition for 'PrintDocument' and no extension method 'PrintDocument' accepting a first argument of type 'System.Windows.Forms.PrintDialog' could be found (are you missing a using directive or an assembly reference?)

1) The type or namespace name 'IDocumentPaginatorSource' could not be found (are you missing a using directive or an assembly reference?)

然后，我尝试通过这种方式从此处修改代码：

private void buttonPrint_Click(object sender, EventArgs e)
{
    WebBrowser wb = getCurrentBrowser();
    wb.ShowPrintDialog();
}

private WebBrowser getCurrentBrowser()
{
    return (WebBrowser)tabControlAlchemyMaps.SelectedTab.Controls[0];
}

...但是得到了“ 未处理System.InvalidCastException HResult = -2147467262消息=无法将类型为“ System.Windows.Forms.Button”的对象转换为类型为“ System.Windows.Forms.WebBrowser”。

然后，我尝试使用以下代码从此处找到的内容派生：

private void buttonPrint_Click(object sender, EventArgs e)
{
    WebBrowser web = getCurrentBrowser();
    web.ShowPrintDialog();
}

private WebBrowser getCurrentBrowser()
{
    // I know there's a better way, because there is only one WebBrowser control on the tab
    foreach (var wb in tabControlAlchemyMaps.SelectedTab.Controls.OfType<WebBrowser>())
    {
        return wb;
    }
    return null;
}

...并且，尽管我可以逐步执行，并且似乎可以正常运行（我进入“ web.ShowPrintDialog（）”行，但未显示任何错误消息），但看不到任何打印对话框。 所以，我怎么能去打印WebBrowser控件的内容是什么？

Answer 1

有关打印Windows窗体Web浏览器控件的MSDN页面： http : //msdn.microsoft.com/zh-cn/library/b0wes9a3(v=vs.90).aspx

private void PrintHelpPage()
{
    // Create a WebBrowser instance. 
    WebBrowser webBrowserForPrinting = new WebBrowser();

    // Add an event handler that prints the document after it loads.
    webBrowserForPrinting.DocumentCompleted +=
        new WebBrowserDocumentCompletedEventHandler(PrintDocument);

    // Set the Url property to load the document.
    webBrowserForPrinting.Url = new Uri(@"\\myshare\help.html");
}

private void PrintDocument(object sender,
    WebBrowserDocumentCompletedEventArgs e)
{
    // Print the document now that it is fully loaded.
    ((WebBrowser)sender).Print();

    // Dispose the WebBrowser now that the task is complete. 
    ((WebBrowser)sender).Dispose();
}