ServiceController.Stop 处的 NullReferenceException

发布于 2024-11-01 00:09:59 字数 1041 浏览 0 评论 0原文

为了能够测试与监视 Windows 服务相关的一些逻辑，我创建了 ServiceController 包装器，通常如下所示：

public class ServiceControllerWrapper : IServiceController
{
    public ServiceControllerWrapper(ServiceController controller)
    {
        this.controller = controller;
    }

    public void Stop()
    {
        if(controller == null)
            return;

        // actually the following code is running in a new thread
        // but nothing more

        try
        {
            controller.Stop();
        }
        catch(...)
        {
            ...
        }
    }

    ... similar methods

    private readonly ServiceController controller;
}

我让控制器为 null，但仍然不可能获得 NullReferenceException，因为在 Stop 开始时检查为 null方法。

它间歇性地发生，我得到的异常是：

System.NullReferenceException 你调用的对象是空的。在 System.ServiceProcess.ServiceController.Stop() 处。

目前仅在 64 位 Win2008 系统上发生错误

我是否有任何错误或控制器在检查不为空后变为空的任何原因？

编辑：

查看 ServiceController 代码内部会有所帮助。在对服务进行任何操作之前，我调用controller.Refresh，它运行良好。

原文

In order to be able to test some logic related with monitoring windows services I created ServiceController wrapper that in general looks like:

public class ServiceControllerWrapper : IServiceController
{
    public ServiceControllerWrapper(ServiceController controller)
    {
        this.controller = controller;
    }

    public void Stop()
    {
        if(controller == null)
            return;

        // actually the following code is running in a new thread
        // but nothing more

        try
        {
            controller.Stop();
        }
        catch(...)
        {
            ...
        }
    }

    ... similar methods

    private readonly ServiceController controller;
}

I let the controller to be null but it is still impossible to get NullReferenceException because of checking to null at the start of the Stop method.

It happens intermittently and the exception I'm getting is:

System.NullReferenceException
Object reference not set to an instance of an object.
at System.ServiceProcess.ServiceController.Stop().

Error currently occur only on 64 bit Win2008 system

Is there any mistakes I'm doing or any reason for controller to become null after checking to be not null?

EDIT:

Looking inside the ServiceController code helped. Before doing any operation with services I'm calling controller.Refresh and it works well.

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