Question

    [RunInstaller(true)]
    public partial class ProjectInstaller : Installer
    {
        private ServiceInstaller m_serviceInstaller;
        private ServiceProcessInstaller m_processInstaller;


        public ProjectInstaller()
        {            
            string Names= ConfigurationManager.AppSettings["Names"].ToString();
            System.Diagnostics.Debugger.Break();
            m_serviceInstaller = new System.ServiceProcess.ServiceInstaller();
            m_processInstaller = new System.ServiceProcess.ServiceProcessInstaller();
            // 
            // serviceProcessInstaller1
            // 
            m_processInstaller.Account = System.ServiceProcess.ServiceAccount.LocalSystem;
            m_processInstaller.Password = null;
            m_processInstaller.Username = null;
            // 
            // serviceInstaller1
            //       
            m_serviceInstaller.ServiceName = "Testing" + Names;
            m_serviceInstaller.DisplayName = "Testing" + Names;
            m_serviceInstaller.Description = "Testing" + Names;
            // 
            // ProjectInstaller
            // 
            this.Installers.AddRange(new System.Configuration.Install.Installer[] {
            m_processInstaller,
            m_serviceInstaller});
        }
    }

我的项目安装程序代码如上所述，它不会得到任何编译错误，但是当我尝试安装它时会回滚，因为它会抛出异常System.Null referenceException。我也有双重确认我的AppConfig没有任何问题。

  <appSettings>       
    <add key="Names" value="BOC" />
  </appSettings>

我可以知道哪里出了问题。

Answer 1

有同样的问题。默认情况下，在服务安装阶段我们正在阅读＆lt; frameworkpath＆gt; \ InstallUtil.exe.Config（例如C：\ Windows \ Microsoft.NET \ Framework \ v4.0.30319 \ InstallUtil.exe.Config）。< / p>

解决方法是手动加载正确的配置：

using System.Reflection;
...

Configuration config = ConfigurationManager.OpenExeConfiguration(
    Assembly.GetExecutingAssembly().Location);

KeyValueConfigurationElement element = config.AppSettings.Settings["Names"];

string names = null;
if (element != null)
    names = element.Value;

ConfigurationManager.AppSettings在Project安装程序中获取错误

1 个答案: