Close Application after WebBrowser print

问题

I tried to print formatted HTML using WebBrowser class. After the print, I want to close the application. If I tried to use close the application the printing is not working. I tried using the timer also nothing works.

Please find the code below.

static void Main(string[] args) {
 var b = new Program();
 string appPath = System.IO.Path.GetDirectoryName(Application.ExecutablePath);
 b.runBrowserThread("file://" + appPath + "/receipt.html");

}

private void runBrowserThread(string url) {
 var th = new Thread(() => {
  var br = new WebBrowser();
  br.DocumentCompleted += browser_DocumentCompleted;
  br.Navigate(url);
  Application.Run();
 });
 th.SetApartmentState(ApartmentState.STA);
 th.Start();
}

void browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) {
 var br = sender as WebBrowser;
 br.Print();
 //Application.ExitThread();
 Environment.Exit(0);
}

回答1:

PrintTemplateTeardown is what you are looking for. You can add a reference to SHDocVw. Then you have access to interfaces like IWebBrowser2 and DWebBrowserEvents2_Event.

You can find SHDocVw as "Microsoft Internet Controls" in COM tab of Reference manager window.

You can subscribe DocumentCompleted event to know when the file/url load completed. You can print html document without showing print dialog by calling IWebBrowser2.ExecWB. Also you can subscribe to DWebBrowserEvents2_Event.PrintTemplateTeardown to find out when print completed so you can close the application:

using System;
using System.Windows.Forms;
using SHDocVw;
class Program
{
    static System.Windows.Forms.WebBrowser browser;
    [STAThread]
    static void Main()
    {
        var fileName = "http://google.com";
        browser = new System.Windows.Forms.WebBrowser();
        browser.ScriptErrorsSuppressed = true;
        browser.DocumentCompleted += browser_DocumentCompleted;
        browser.Navigate(fileName);
        Application.Run();
    }
    private static void browser_DocumentCompleted(object sender, 
        WebBrowserDocumentCompletedEventArgs e)
    {
        var iwb2 = (IWebBrowser2)browser.ActiveXInstance;
        var events = (DWebBrowserEvents2_Event)browser.ActiveXInstance;
        events.PrintTemplateTeardown += browser_PrintTemplateTeardown;
        var missing = Type.Missing;
        iwb2.ExecWB(OLECMDID.OLECMDID_PRINT, OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, 
        ref missing, ref missing);
    }
    private static void browser_PrintTemplateTeardown(object pDisp)
    {
        browser.Dispose();
        Application.Exit();
    }
}

来源：https://stackoverflow.com/questions/57310536/close-application-after-webbrowser-print