Question

我有一个针对桌面操作系统（XP，Vista，Win7）的应用程序以及运行Windows XP Embedded的移动设备。所有平台都运行完整的.Net Framework，不 Compact Framework。该应用程序使用AppDomain.UnhandledException事件来检测并记录任何致命的应用程序错误。没有什么不寻常的，它完美无缺 - 至少在桌面操作系统上。

在应用程序的另一个位置，有一段代码调用NetworkInterface.GetAllNetworkInterfaces方法来获取计算机上的NIC列表。在Windows XP Embedded上 - 但不是桌面操作系统 - 一旦调用此方法，当发生未处理的异常时，AppDomain.UnhandledException事件不再触发。相反，应用程序崩溃，甚至没有显示标准的.Net崩溃对话框。

这是一个已知的错误，还是我做错了什么？有人知道解决方法吗？

以下是重现问题的示例应用程序。这个例子是用WinForms编写的，但同样的问题也出现在WPF中。

using System;
using System.Net.NetworkInformation;
using System.Threading;
using System.Windows.Forms;

namespace BugDemo
{
    public class BugDemoForm : Form
    {
        /// <summary>
        /// This is the entry point of the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
            Application.Run(new BugDemoForm());
        }

        /// <summary>
        /// Sets up a simple form with two buttons for reproducing the bug.
        /// </summary>
        public BugDemoForm()
        {
            Padding = new Padding(15);
            Width = 400;
            int halfHeight = (ClientRectangle.Height / 2) - Padding.Vertical;

            Button exceptionButton = new Button();
            exceptionButton.Dock = DockStyle.Top;
            exceptionButton.Height = halfHeight;
            exceptionButton.Text = "Test the AppDomain.UnhandledException method";
            exceptionButton.Click += exceptionButton_Click;
            Controls.Add(exceptionButton);

            Button networkInterfacesButton = new Button();
            networkInterfacesButton.Dock = DockStyle.Bottom;
            networkInterfacesButton.Height = halfHeight;
            networkInterfacesButton.Text = "Call the NetworkInterface.GetAllNetworkInterfaces method";
            networkInterfacesButton.Click += networkInterfacesButton_Click;
            Controls.Add(networkInterfacesButton);
        }

        /// <summary>
        /// Throws an exception on a background thread. 
        /// This will cause the <see cref="AppDomain.UnhandledException"/> event to fire.
        /// </summary>
        private static void exceptionButton_Click(object sender, EventArgs e)
        {
            ThreadPool.QueueUserWorkItem(
                delegate(object state)
                {
                    throw new ApplicationException();
                });
        }

        /// <summary>
        /// Calls the <see cref="NetworkInterface.GetAllNetworkInterfaces"/> method.
        /// Once this method is called, the <see cref="AppDomain.UnhandledException"/> event
        /// will no longer fire.
        /// </summary>
        private static void networkInterfacesButton_Click(object sender, EventArgs e)
        {
            NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
            MessageBox.Show("There are " + nics.Length + " network interfaces on this machine.\n\n"
                + "Now that the NetworkInterface.GetAllNetworkInterfaces method has been called, "
                + "the AppDomain.UnhandledException event will no longer fire when running on "
                + "Windows XP Embedded.");
        }

        /// <summary>
        /// Fires whenever an unhandled exception occurs on a background thread.
        /// However, once the <see cref="NetworkInterface.GetAllNetworkInterfaces"/> method has been
        /// called, this event no longer fires.
        /// </summary>
        private static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            MessageBox.Show("The AppDomain.UnhandledException event fired successfully.\n"
                + "The app will now crash, as expected.");
        }
    }
}

NetworkInterface.GetAllNetworkInterfaces导致AppDomain.UnhandledException在Windows XP Embedded上停止触发

0 个答案: