在 Windows 服务 C# 中引发自定义类事件 [英] Raising Custom Class Events In Windows Service C#
问题描述
我确实编写了一个可以使用 dll 连接到网络设备的 Windows 服务.所以一切正常，但事件处理程序在 win 服务中不起作用！这是我的代码:
I did write a windows service that can connect to a network device using a dll. so everything works fine, but The event handler does not work in win service! here is my code :
我的自定义类代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MyNewService
{
public class zkemkeeperHandler
{
public event EventHandler OnFinger;
public event EventHandler<VerifyEventArgs> OnVerify;
private System.Diagnostics.EventLog eventLog1 = new System.Diagnostics.EventLog();
public zkemkeeper.CZKEMClass axCZKEM1 = new zkemkeeper.CZKEMClass();
private bool bIsConnected = false;
private int iMachineNumber = 1;
public zkemkeeperHandler()
{
((System.ComponentModel.ISupportInitialize)(this.eventLog1)).BeginInit();
this.eventLog1.Log = "DoDyLog";
this.eventLog1.Source = "DoDyLogSource";
((System.ComponentModel.ISupportInitialize)(this.eventLog1)).EndInit();
eventLog1.WriteEntry("zkemkeeperHandler constructor");
}
public void startService()
{
eventLog1.WriteEntry("start service for (192.168.0.77:4370)");
bIsConnected = axCZKEM1.Connect_Net("192.168.0.77", Convert.ToInt32("4370"));
if (bIsConnected == true)
{
eventLog1.WriteEntry("bIsConnected == true !");
iMachineNumber = 1;
if (axCZKEM1.RegEvent(iMachineNumber, 65535))
{
this.axCZKEM1.OnFinger += new kemkeeper._IZKEMEvents_OnFingerEventHandler(axCZKEM1_OnFinger);
this.axCZKEM1.OnVerify += new zkemkeeper._IZKEMEvents_OnVerifyEventHandler(axCZKEM1_OnVerify);
//This Log Appears in Event Viewer
eventLog1.WriteEntry("Define events (OnFingers and OnVerify) !");
//This Line Fires Event in Service1.cs for testing event handler
Finger(EventArgs.Empty);
}
}
else
{
eventLog1.WriteEntry("Unable to connect the device");
}
}
public void stopService()
{
if (bIsConnected) {axCZKEM1.Disconnect(); bIsConnected = false;}
}
//This method doesn't run :(
private void axCZKEM1_OnFinger()
{
Finger(EventArgs.Empty);
}
//This method doesn't run too :(
private void axCZKEM1_OnVerify(int iUserID)
{
VerifyEventArgs args = new VerifyEventArgs();
args.UserID = iUserID;
Verify(args);
}
public class VerifyEventArgs : EventArgs
{
public int UserID { get; set; }
}
protected virtual void Finger(EventArgs e)
{
EventHandler handler = OnFinger;
if (handler != null)
handler(this, e);
}
protected virtual void Verify(VerifyEventArgs e)
{
EventHandler<VerifyEventArgs> handler = OnVerify;
if (handler != null)
handler(this, e);
}
}
}
我的主要服务类代码:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
using System.Linq;
using System.Threading;
namespace MyNewService
{
public class Service1 : System.ServiceProcess.ServiceBase
{
private System.Diagnostics.EventLog eventLog1;
private System.ComponentModel.Container components = null;
zkemkeeperHandler zkh;
public Service1()
{
InitializeComponent();
if (!System.Diagnostics.EventLog.SourceExists("DoDyLogSource"))
{
System.Diagnostics.EventLog.CreateEventSource("DoDyLogSource", "DoDyLog");
}
eventLog1.Source = "DoDyLogSource";
eventLog1.Log = "DoDyLog";
eventLog1.WriteEntry("Preparing to start service");
try
{
startZKHandler();
}
catch (Exception ex)
{
eventLog1.WriteEntry(ex.InnerException.Message);
}
}
private void startZKHandler()
{
eventLog1.WriteEntry("creating zkemkeeper handler class");
zkh = new zkemkeeperHandler();
zkh.OnFinger += OnFinger;
zkh.OnVerify += OnVerify;
zkh.startService();
}
private void stopZKHandler()
{
eventLog1.WriteEntry("Disconnecting from device (192.168.0.77)...");
zkh.stopService();
}
private void writeLog2DB(string message)
{
try
{
eventLog1.WriteEntry("writing to database");
DB.DBase.LogTable.AddObject(new LogTable
{
ID = ++DB.IDCounter,
deviceLog = message
});
DB.DBase.SaveChanges();
}
catch (Exception ex)
{
eventLog1.WriteEntry(ex.Message + " - " + ex.InnerException.Message);
}
this.EventLog.Log = "Event Stored in DB.";
}
// The main entry point for the process
static void Main()
{
System.ServiceProcess.ServiceBase[] ServicesToRun;
ServicesToRun = new System.ServiceProcess.ServiceBase[] { new MyNewService.Service1()};
System.ServiceProcess.ServiceBase.Run(ServicesToRun);
}
private void InitializeComponent()
{
this.eventLog1 = new System.Diagnostics.EventLog();
((System.ComponentModel.ISupportInitialize)(this.eventLog1)).BeginInit();
this.eventLog1.Log = "DoDyLog";
this.eventLog1.Source = "DoDyLogSource";
this.ServiceName = "MyNewService";
((System.ComponentModel.ISupportInitialize)(this.eventLog1)).EndInit();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
protected override void OnStart(string[] args)
{
// TODO: Add code here to start your service.
eventLog1.WriteEntry("my service started");
}
protected override void OnStop()
{
// TODO: Add code here to perform any tear-down necessary to stop your service.
eventLog1.WriteEntry("my service stoped");
stopZKHandler();
}
protected override void OnContinue()
{
eventLog1.WriteEntry("my service is continuing in working");
}
private void OnFinger(object sender, EventArgs e)
{
eventLog1.WriteEntry("Finger Event Raised");
}
private void OnVerify(object sender, zkemkeeperHandler.VerifyEventArgs e)
{
eventLog1.WriteEntry("Verify Event Raised");
}
}
}
我的错误是什么?请帮帮我！
What is my mistake? please help me!
我编写的 Windows 服务可以引发自定义事件，但不能引发我的 dll 事件！
The Windows Service that I wrote, can raise custom events but cannot raise my dll events!
推荐答案
我知道这个帖子很老了，但是我昨天遇到了这个问题，现在我终于找到了解决方案，浪费了好几个小时.问题是，COM 对象必须从 STA 线程创建，然后，为了正确调度事件，同一个 STA 线程(完全相同)必须泵送 COM消息.这可以通过在循环中调用 Application.DoEvents() 或 Application.Run() 来完成.
I know this thread is old, but I had this problem yesterday, and now I have finally found a solution, after many hours wasted. The problem is that, the COM object must be created from an STA Thread, and then, for the events to be dispatched correctly, the same STA thread (exactly the same) must be pumping COM messages. This can be done calling Application.DoEvents() in a loop or Application.Run().
这是我的工作代码(它可以工作，即使作为 Vista+ 中的非交互式 Windows 服务，我使用的是 Windows 8.1)
So here is my working code (it works, even as a non-interactive Windows Service in Vista+, I am using Windows 8.1)
Thread createComAndMessagePumpThread = new Thread(() =>
{
this.Device = new CZKEMClass(); //Here create COM object
Application.Run();
});
createComAndMessagePumpThread.SetApartmentState(ApartmentState.STA);
createComAndMessagePumpThread.Start();
设备创建后，您可以从任何线程注册事件，它们由创建 COM 对象的 STA 线程分派.
After the device gets created you can register the events from any thread, and they get dispatched by the STA thread, that created the COM object.
在 Windows 窗体应用程序中，无需执行此操作即可工作，因为 STA 主线程运行调用 Application.Run(Form) 的窗体.Application.Run() 然后派发 COM 事件和 Windows GUI 事件等事件，因此无需使用上述技巧.
In Windows Forms application, this worked without doing this, because the STA main thread run the form calling Application.Run(Form). Application.Run() then dispatch events like COM events and Windows GUI events, so there is no need to to the trick above.
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