Question

我想以编程方式检查是否安装了最新版本的Windows服务。我有：

var ctl = ServiceController.GetServices().Where(s => s.ServiceName == "MyService").FirstOrDefault();
if (ctl != null) {
  // now what?
}

我在ServiceController界面上看不到会告诉我版本号的任何内容。我该怎么做？

Answer 1

我担心除了从注册表中获取可执行文件路径之外没有办法，因为ServiceController不提供该信息。

以下是我之前创建的示例：

private static string GetExecutablePathForService(string serviceName, RegistryView registryView, bool throwErrorIfNonExisting)
    {
        string registryPath = @"SYSTEM\CurrentControlSet\Services\" + serviceName;
        RegistryKey key = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, registryView).OpenSubKey(registryPath);
        if(key==null)
        {
            if (throwErrorIfNonExisting)
                throw new ArgumentException("Non-existent service: " + serviceName, "serviceName");
            else
                return null;
        }
        string value = key.GetValue("ImagePath").ToString();
        key.Close();
        if(value.StartsWith("\""))
        {
            value = Regex.Match(value, "\"([^\"]+)\"").Groups[1].Value;
        }

        return Environment.ExpandEnvironmentVariables(value);
    }

获取exe路径后，只需使用FileVersionInfo.GetVersionInfo(exePath)类来获取版本。

Answer 2

如果您拥有该服务，则可以将版本信息放入DisplayName，例如DisplayName="MyService 2017.06.28.1517"。这允许您查找服务的现有安装并解析版本信息：

var ctl = ServiceController
    .GetServices()
    .FirstOrDefault(s => s.ServiceName == "MyService");
if (ctl != null) {
    // get version substring, you might have your own style.
    string substr = s.DisplayName.SubString("MyService".Length);
    Version installedVersion = new Version(substr);
    // do stuff, e.g. check if installed version is newer than current assembly.
}

如果您想避免使用注册表，这可能很有用。问题是，服务条目可以根据安装例程转到注册表的不同部分。

Answer 3

如果您要谈论的是从程序集属性中自动获取服务的当前版本，则可以在ServiceBase类中设置诸如下面的属性。

public static string ServiceVersion { get; private set; }

然后在您的OnStart方法中添加以下内容...

ServiceVersion = typeof(Program).Assembly.GetName().Version.ToString();

完整示例

using System.Diagnostics;
using System.ServiceProcess;

public partial class VaultServerUtilities : ServiceBase
{

    public static string ServiceVersion { get; private set; }

    public VaultServerUtilities()
    {
        InitializeComponent();

        VSUEventLog = new EventLog();
        if (!EventLog.SourceExists("Vault Server Utilities"))
        {
            EventLog.CreateEventSource("Vault Server Utilities", "Service Log");
        }

        VSUEventLog.Source = "Vault Server Utilities";
        VSUEventLog.Log = "Service Log";

    }


    protected override void OnStart(string[] args)
    {

        ServiceVersion = typeof(Program).Assembly.GetName().Version.ToString();
        VSUEventLog.WriteEntry(string.Format("Vault Server Utilities v{0} has started successfully.", ServiceVersion));

    }

    protected override void OnStop()
    {
        VSUEventLog.WriteEntry(string.Format("Vault Server Utilities v{0} has be shutdown.", ServiceVersion));
    }
}

在上面的示例中，我的事件日志显示了我的服务的当前版本...

获取已安装服务的版本信息？

3 个答案: