我一直在浏览各种WebBrowser control stackoverflow questions,我似乎找不到我遇到的问题的答案。我正在尝试使用WebBrowser control to print a web page。在MSDN's example之后,我创建了以下控制台应用程序:
namespace WebPrintingMadness
{
using System;
using System.Collections.Generic;
using System.Text;
/// <summary>
/// The entry point of the program.
/// </summary>
class Program
{
/// <summary>
/// The main entry point of the program.
/// </summary>
/// <param name="args">Program arguments.</param>
[STAThread]
public static void Main(string[] args)
{
string url = "https://stackoverflow.com/";
WebPagePrinter webPagePrinter = new WebPagePrinter();
webPagePrinter.PrintWebPage(url);
Console.ReadLine();
}
}
}
namespace WebPrintingMadness
{
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
/// <summary>
/// This class is used to print a web page.
/// </summary>
internal class WebPagePrinter : IDisposable
{
/// <summary>
/// A System.Windows.Forms.WebBrowser control.
/// </summary>
private WebBrowser webBrowser;
/// <summary>
/// Initializes a new instance of the WebPagePrinter class.
/// </summary>
internal WebPagePrinter()
{
this.webBrowser = new WebBrowser();
this.webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(this.WebBrowser_DocumentCompleted);
this.webBrowser.ScriptErrorsSuppressed = true;
}
/// <summary>
/// Disposes of this instance.
/// </summary>
public void Dispose()
{
this.Dispose(true);
GC.SuppressFinalize(this);
}
/// <summary>
/// Prints a web page.
/// </summary>
/// <param name="url">The url of the web page.</param>
internal void PrintWebPage(string url)
{
this.webBrowser.Navigate(url);
}
/// <summary>
/// Disposes of this instance.
/// </summary>
/// <param name="disposing">True if disposing, otherwise false.</param>
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
if (this.webBrowser != null)
{
this.webBrowser.Dispose();
this.webBrowser = null;
}
}
}
/// <summary>
/// Event handler for the webBrowser DocumentCompleted event.
/// </summary>
/// <param name="sender">The event sender.</param>
/// <param name="e">The event arguments.</param>
private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser navigated = sender as WebBrowser;
if (navigated == null)
{
return;
}
navigated.Print();
navigated.Dispose();
}
}
}
但是,DocumentCompleted事件永远不会触发。是否可以在控制台应用程序中使用此Windows.Forms控件?
答案 0 :(得分:2)
只要流程正在运行,它就会起作用。
您可以在等待循环中简单地调用“Application.DoEvents()”。你不需要做任何比这更好的事情,它在我的控制台应用程序中工作正常。
答案 1 :(得分:1)
STA线程的基本要求是它需要运行消息泵。 在Windows窗体中,您可以使用Application.Run。或者您可以使用user32手动编写消息泵!GetMessage&amp; DispatchMessage函数。但是在WinForms或WPF中使用它可能更容易。