Windows 服务^{(Windows Services)}是可以在后台自行运行或在事件可以触发它启动和停止时运行的程序类型。可以使用一种称为Trigger的交互来启动或停止这些服务。这些触发器由动作或事件触发。服务还有另一个特征，即启动类型^{(Startup Type)}。服务^(Services)依赖于这两个特性。

在这篇文章中，我们将讨论什么是Automatic ( Trigger Start ) 和Manual ( Trigger Start ) 以及它们对Windows 服务^(Services)的意义。

自动（触发启动）和手动（触发启动）

自动^(Automatic)（触发开始^{(Trigger Start)}）和手动^(Manual)（触发开始^{(Trigger Start)}）

打开Windows 服务^{(Windows Services)}管理单元或服务^(Services) 管理器^(Manager)面板。除了服务^(Service)名称，它还将显示描述^{(Description)}、状态^(Status)、启动类型^{(Startup Type)}和登录^(Log)身份的详细信息列。在这篇文章中，我们对Startup Type感兴趣。基本上^(Basically)启动类型是——

自动的
自动（延迟启动）
自动（触发启动）
手动的
手动（触发启动）
已禁用。

自动启动类型^{(Automatic Startup Type)}是什么意思？

许多服务设置为随Windows启动，即在计算机启动时启动。它们不需要用户权限，但它们是通过Windows授权的本地系统^{(Local System)}用户运行的，用于许多管理员工作。

在服务^(Services) 管理单元中^(Snap-in)，双击打开任何服务，然后切换到常规^(General)选项卡。服务的启动类型^{(Startup Type)}设置为从引导启动，将设置为自动^(Automatic)。

手动启动类型是什么意思？

这些类型的服务^(Services)不会随着计算机启动而启动。它们是由于其他一些依赖服务^(Service)或事件而启动的。它也可以由计算机用户通过服务管理器^{(Services Manager)}启动。

触发开始是什么意思？

我敢肯定，此时您已经注意到某些服务具有附加条件以及启动类型 - Trigger Start。它可以是手动^(Manual)或自动^(Automatic) 启动类型^{(Startup Type)}。简单来说，Trigger Start就是可以通过操作系统事件来启动或停止服务。

这些触发器发挥着重要作用，因为没有它，服务^(Service)必须继续运行后台消耗资源、电力和电池。Windows 提供了所谓的服务触发事件^{(Service Trigger Events)}。开发人员可以部署服务^(Service)并注册以在触发事件发生时启动或停止。

一个典型的例子是你每天所经历的。每次下载文件时，防病毒软件都会自动扫描它。另一个例子是当设备第一次连接到计算机时，Windows将开始查找和下载驱动程序。

也就是说，并非所有服务都有触发器^(Trigger)启动。只有当服务至少有一个触发器时，它才会在相关服务^(Service)的括号中显示Trigger Start。触发器的好处在于，它不仅消除了让它们一直运行的需要，而且还摆脱了轮询、主动等待偶数等等。

如何从服务^(Service)中删除触发器？

删除服务触发器

Windows SDK提供了一个命令行实用程序Sc.exe，可用于控制Service。现在，例如，如果您想从Windows上的Xbox 服务^{(Xbox Service)}中删除触发器，请按照以下步骤操作。

查询服务^{(Query a Service)}

sc qtriggerinfo XboxGipSvc

删除触发器^{(Delete a trigger)}

sc triggerinfo XboxGipSvc delete

此类触发器的数据存储在注册表^(Registry)或组策略^{(Group Policy)}（机器或用户）中。

我希望这篇文章能澄清一些事情。

相关阅读：^{(Related read:)} Windows 服务：你想知道的关于它们的一切。

Automatic (Trigger Start) and Manual (Trigger Start) for Windows Services

Windows Services are types of programs that can run by themselves in the background or when an event can trigger it to start and stop. These services can be started or stopped using a type of interaction called a Trigger. These triggers are fired by action or an event. Services have another characteristic i.e., Startup Type. Services depend on both of these features.

In this post, we will talk about what Automatic (Trigger Start) and Manual (Trigger Start) and what they mean for Windows Services.

Automatic (Trigger Start) and Manual (Trigger Start)

Open Windows Services snap-in or the Services Manager panel. Along with the Service name, it will also display columns which detail on Description, Status, Startup Type, and Log On as. In this post, we are interested in the Startup Type. Basically the startup types are—

Automatic
Automatic (Delayed Start)
Automatic (Trigger Start)
Manual
Manual (Trigger Start)
Disabled.

What does Automatic Startup Type mean?

Many Services are set to start with Windows i.e. when the computer boots. They do not need user permission, but they are run through Local System user who is authorized by Windows for a lot of administrator jobs.

In the Services Snap-in, double click to open any services, and switch to the General tab. The Startup Type for the service, which is set to start with the boot, will be set to Automatic.

What does Manual Startup Type mean?

These types of Services don’t start with the computer boot. They start because of some other dependant Service or an event. It can also be initiated by a computer user through the Services Manager.

What does Trigger Start mean?

I am sure by this time you have already noticed that some of the services have additional conditions along with the startup type — Trigger Start. It can be for both Manual or Automatic Startup Type. In simple words, Trigger Start means that the service can be started or stopped by operating system events.

These triggers play an important role because, without it, the Service has to keep running the background consuming resources, power, and battery. Windows offers what is called as Service Trigger Events. Developers can deploy a Service and register to be started or stopped when a trigger event occurs.

One classic example is what you experience every day. Every time you download a file, the antivirus will scan it automatically. The other example is when a device is connected to the computer for the first time, Windows will start finding and downloading the drivers.

That said, not all of the services have Trigger start. Only when a service has at least one trigger, it will show up Trigger Start in brackets agains the concerned Service. The good thing about the triggers is that it not only eliminates the need to keep them running all the time but also gets rid of polling, actively waiting for an even and so on.

How to remove Triggers from a Service?

remove service trigger

Windows SDK offers a command-line utility, Sc.exe, that can be used to control a Service. Now, for example, if you want to remove a trigger from Xbox Service on Windows, here are the steps to follow.

Query a Service

sc qtriggerinfo XboxGipSvc

Delete a trigger

sc triggerinfo XboxGipSvc delete

The data for such triggers are stored in the Registry or in the Group Policy (machine or user).

I hope this post clarified things a bit.

Related read: Windows Services: Everything you wanted to know about them.

飞邱

About the author

我是一名 Windows 专家，在软件行业工作了 10 多年。我有使用 Microsoft Windows 和 Apple Macintosh 系统的经验。我的技能包括：窗口管理、计算机硬件和声音、应用程序开发等等。我是一位经验丰富的顾问，可以帮助您充分利用 Windows 系统。