如果需要仅使用设置完成此操作,请按照以下步骤进行:
可以通过显式实现现有服务的移除(卸载),然后允许安装较新版本来处理此问题。
为此,我们需要更新ProjectInstaller.Designer.cs如下:
请在InitializeComponent()函数开头处添加以下代码行,以在当前安装程序尝试重新安装服务之前触发卸载现有服务的事件。在这里,如果服务已经存在,我们将卸载该服务。
添加以下命名空间:
using System.Collections.Generic;
using System.ServiceProcess;
按照之前描述的方式添加以下代码行:
this.BeforeInstall += new
System.Configuration.Install.InstallEventHandler(ProjectInstaller_BeforeInstall)
例子:
private void InitializeComponent()
{
this.BeforeInstall += new System.Configuration.Install.InstallEventHandler(ProjectInstaller_BeforeInstall);
this.serviceProcessInstaller1 = new System.ServiceProcess.ServiceProcessInstaller();
this.serviceInstaller1 = new System.ServiceProcess.ServiceInstaller();
//
// serviceProcessInstaller1
//
this.serviceProcessInstaller1.Account = System.ServiceProcess.ServiceAccount.LocalSystem;
this.serviceProcessInstaller1.Password = null;
this.serviceProcessInstaller1.Username = null;
//
// serviceInstaller1
//
this.serviceInstaller1.Description = "This is my service name description";
this.serviceInstaller1.ServiceName = "MyServiceName";
this.serviceInstaller1.StartType = System.ServiceProcess.ServiceStartMode.Automatic;
//
// ProjectInstaller
//
this.Installers.AddRange(new System.Configuration.Install.Installer[]{
this.serviceProcessInstaller1,
this.serviceInstaller1
}
);
}
下面的代码将被事件调用,如果服务存在,则卸载该服务。
void ProjectInstaller_BeforeInstall(object sender, System.Configuration.Install.InstallEventArgs e)
{
List<ServiceController> services = new List<ServiceController>(ServiceController.GetServices());
foreach (ServiceController s in services)
{
if (s.ServiceName == this.serviceInstaller1.ServiceName)
{
ServiceInstaller ServiceInstallerObj = new ServiceInstaller();
ServiceInstallerObj.Context = new System.Configuration.Install.InstallContext();
ServiceInstallerObj.Context = Context;
ServiceInstallerObj.ServiceName = "MyServiceName";
ServiceInstallerObj.Uninstall(null);
break;
}
}
}
顺便提一下,除了以上更改,请考虑更新设置版本、产品代码(以及可选的升级代码),以便进行良好的实践、更好的版本管理、跟踪和维护。