c# - 如何在 C# 中打印 html

Question

我想在 C# 中使用 PrintDocument 打印文件。该文件是简单的 HTML（我需要它，因为我需要文件中的文本位于页面内的特定位置。）

我的问题是，如何打印文件，这样它就不会打印 HTML 本身（标签等），而是打印在 Web 浏览器中显示的 HTML？

Answer 1

使用Web 浏览器控件并在其上调用 print 方法，如下所示：

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();
}

关于这样做的 MSDN 文章

Answer 2

使用此方法可以成功打印 HTML，因为存在会导致DocumentCompletedEvent 多次触发的错误。我有一个简单的解决方案 -

private class yourClassName
{
        WebBrowser webBrowserForPrinting;
        public void YourForm_Load()
        {
             webBrowserForPrinting = new webBrowserForPrinting();
             // Set the Url property to load the document.
             webBrowserForPrinting.Url = new Uri("Your HTML File Directory");
             webBrowserForPrinting.DocumentCompleted += WebBrowserForPrinting_DocumentCompleted;
        }

        int i = 0;
        private void WebBrowserForPrinting_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            i++;
            if (i == 1)
            {
                ((WebBrowser)sender).ShowPrintPreviewDialog();
            }

            else
            {
                ((WebBrowser)sender).Dispose();
            }
        }
}

此方法还将向您显示printing dialog预览。如果您不想预览，请改用这个 -

private class yourClassName
{
        WebBrowser webBrowserForPrinting;
        public void YourForm_Load()
        {
             webBrowserForPrinting = new webBrowserForPrinting();
             // Set the Url property to load the document.
             webBrowserForPrinting.Url = new Uri("Your HTML File Directory");
             webBrowserForPrinting.DocumentCompleted += WebBrowserForPrinting_DocumentCompleted;
        }

        int i = 0;
        private void WebBrowserForPrinting_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            i++;
            if (i == 1)
            {
                ((WebBrowser)sender).ShowPrintDialog();
            }

            else
            {
                ((WebBrowser)sender).Dispose();
            }
        }
}