打印WebBrowser没有预览，即单击打印

我有一个交stream＃.Net应用程序，打开一个自定义的打印预览表单（妥协的WebBrowser表单控件，显示一个HTML文件和一个button，打印的Web浏览器控件的内容：

webBrowser.Print(); 

但是，我现在想打印HTML文件，而不打开这种forms。

我已经试图加载到一个web浏览器窗体的HTML不显示窗体，并调用webBrowser.Print（）但没有任何打印。 看来我只能打印，如果我显示窗体并加载到控件的HTML。

Answer 1

我有一个示例控制台应用程序，使用WinForms WebBrowser打印一组HTML文件。 您可以DoWorkAsync WinForms应用程序中的DoWorkAsync部分来进行打印任务，几乎不需要任何更改：

 // by Noseratio - http://stackoverflow.com/users/1768303/noseratio using System; using System.Threading; using System.Threading.Tasks; using System.Windows.Forms; namespace ConsoleApplicationWebBrowser { class Program { // Entry Point of the console app static void Main(string[] args) { try { // download each page and dump the content var task = MessageLoopWorker.Run(DoWorkAsync, "http://www.example.com", "http://www.example.net", "http://www.example.org"); task.Wait(); Console.WriteLine("DoWorkAsync completed."); } catch (Exception ex) { Console.WriteLine("DoWorkAsync failed: " + ex.Message); } Console.WriteLine("Press Enter to exit."); Console.ReadLine(); } // navigate WebBrowser to the list of urls in a loop static async Task<object> DoWorkAsync(object[] args) { Console.WriteLine("Start working."); var wb = new WebBrowser(); wb.ScriptErrorsSuppressed = true; if (wb.Document == null && wb.ActiveXInstance == null) throw new ApplicationException("Unable to initialize the underlying WebBrowserActiveX"); // get the underlying WebBrowser ActiveX object; // this code depends on SHDocVw.dll COM interop assembly, // generate SHDocVw.dll: "tlbimp.exe ieframe.dll", // and add as a reference to the project var wbax = (SHDocVw.WebBrowser)wb.ActiveXInstance; TaskCompletionSource<bool> loadedTcs = null; WebBrowserDocumentCompletedEventHandler documentCompletedHandler = (s, e) => loadedTcs.TrySetResult(true); // turn event into awaitable task TaskCompletionSource<bool> printedTcs = null; SHDocVw.DWebBrowserEvents2_PrintTemplateTeardownEventHandler printTemplateTeardownHandler = (p) => printedTcs.TrySetResult(true); // turn event into awaitable task // navigate to each URL in the list foreach (var url in args) { loadedTcs = new TaskCompletionSource<bool>(); wb.DocumentCompleted += documentCompletedHandler; try { wb.Navigate(url.ToString()); // await for DocumentCompleted await loadedTcs.Task; } finally { wb.DocumentCompleted -= documentCompletedHandler; } // the DOM is ready, Console.WriteLine(url.ToString()); Console.WriteLine(wb.Document.Body.OuterHtml); // print the document printedTcs = new TaskCompletionSource<bool>(); wbax.PrintTemplateTeardown += printTemplateTeardownHandler; try { wb.Print(); // await for PrintTemplateTeardown - the end of printing await printedTcs.Task; } finally { wbax.PrintTemplateTeardown -= printTemplateTeardownHandler; } Console.WriteLine(url.ToString() + " printed."); } wb.Dispose(); Console.WriteLine("End working."); return null; } } // a helper class to start the message loop and execute an asynchronous task public static class MessageLoopWorker { public static async Task<object> Run(Func<object[], Task<object>> worker, params object[] args) { var tcs = new TaskCompletionSource<object>(); var thread = new Thread(() => { EventHandler idleHandler = null; idleHandler = async (s, e) => { // handle Application.Idle just once Application.Idle -= idleHandler; // return to the message loop await Task.Yield(); // and continue asynchronously // propogate the result or exception try { var result = await worker(args); tcs.SetResult(result); } catch (Exception ex) { tcs.SetException(ex); } // signal to exit the message loop // Application.Run will exit at this point Application.ExitThread(); }; // handle Application.Idle just once // to make sure we're inside the message loop // and SynchronizationContext has been correctly installed Application.Idle += idleHandler; Application.Run(); }); // set STA model for the new thread thread.SetApartmentState(ApartmentState.STA); // start the thread and await for the task thread.Start(); try { return await tcs.Task; } finally { thread.Join(); } } } } 

Answer 2

我知道的唯一方法是将网站呈现为图像，然后默默打印。 也许这个项目会帮助你。

Answer 3

你正在试图做的是叫。

无声打印

也许你应该寻找替代品，取决于你的技术。 Forms和WPF的实现有所不同。