Question

我是WMI的新手，我需要在C＃服务中实现RegistryValueChangeEvent。

我需要一个事件处理程序，每次更改一组注册表值时都会触发该事件处理程序。我希望行为类似于FileSystemWatcher类的Changed事件，但是对于注册表值。

如果我可以使用其他一些技术来完成相同的任务，我也会感激。我的最低要求是它比现在更好的解决方案：每20秒轮询一次，并将注册表值与最后的结果进行比较。

请在答案中提供示例代码。如果我只能看一个注册表值的示例，那就没问题了。

我需要.Net 2.0中的解决方案

感谢。

Answer 1

WMI有时可能很有趣......我想我理解你的问题，所以请看下面的代码片段，让我知道它是不是你想要的。

// --------------------------------------------------------------------------------------------------------------------- 
// <copyright file="Program.cs" company="">
//   
// </copyright>
// <summary>
//   Defines the WmiChangeEventTester type.
// </summary>
// ---------------------------------------------------------------------------------------------------------------------
namespace WmiExample
{
    using System;
    using System.Management;

    /// <summary>
    /// </summary>
    public class WmiChangeEventTester
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="WmiChangeEventTester"/> class.
        /// </summary>
        public WmiChangeEventTester()
        {
            try
            {
                // Your query goes below; "KeyPath" is the key in the registry that you
                // want to monitor for changes. Make sure you escape the \ character.
                WqlEventQuery query = new WqlEventQuery(
                     "SELECT * FROM RegistryValueChangeEvent WHERE " +
                     "Hive = 'HKEY_LOCAL_MACHINE'" +
                     @"AND KeyPath = 'SOFTWARE\\Microsoft\\.NETFramework' AND ValueName='InstallRoot'");

                ManagementEventWatcher watcher = new ManagementEventWatcher(query);
                Console.WriteLine("Waiting for an event...");

                // Set up the delegate that will handle the change event.
                watcher.EventArrived += new EventArrivedEventHandler(HandleEvent);

                // Start listening for events.
                watcher.Start();

                // Do something while waiting for events. In your application,
                // this would just be continuing business as usual.
                System.Threading.Thread.Sleep(100000000);

                // Stop listening for events.
                watcher.Stop();
            }
            catch (ManagementException managementException)
            {
                Console.WriteLine("An error occurred: " + managementException.Message);
            }
        }

        /// <summary>
        /// </summary>
        /// <param name="sender">
        /// The sender.
        /// </param>
        /// <param name="e">
        /// The e.
        /// </param>
        private void HandleEvent(object sender, EventArrivedEventArgs e)
        {
            Console.WriteLine("Received an event.");
            // RegistryKeyChangeEvent occurs here; do something.
        }

        /// <summary>
        /// </summary>
        public static void Main()
        {
            // Just calls the class above to check for events...
            WmiChangeEventTester receiveEvent = new WmiChangeEventTester();
        }
    }
}

Answer 2

您是否仅限于WMI？如果不是，您可以使用RegNotifyChangeKeyValue

之类的RegistryMonitor包装器

Answer 3

正如其他人所指出的那样，你真的不需要WMI。我也没有使用过RegistryMonitor。

如果您需要一个示例，则页面本身已经有RegistryMonitor的示例代码。您是否在代码项目中向下滚动到这一位：

public class MonitorSample
{
    static void Main() 
    {
        RegistryMonitor monitor = new 
          RegistryMonitor(RegistryHive.CurrentUser, "Environment");
        monitor.RegChanged += new EventHandler(OnRegChanged);
        monitor.Start();

        while(true);

        monitor.Stop();
    }

    private void OnRegChanged(object sender, EventArgs e)
    {
        Console.WriteLine("registry key has changed");
    }
}

Answer 4

您需要为它使用WMI。见http://msdn.microsoft.com/en-us/library/aa393035.aspx

Registry Watcher C＃

4 个答案: