Question

尝试在Windows服务中使用自定义app.config部分时出现异常。我已经成功地在其他应用程序中编写了自定义部分，所以我确信我的机制正确，并且在涉及Windows服务时会发生一些事情。如果需要，我可以包含app.config Xml。

首次尝试

我在C＃windows服务构造函数中有以下代码：

int systemErrorWindowSeconds = 
    ServiceSettings.Current.ExceptionHandling.SystemErrorWindowSeconds;

ServiceSettings（重要位）如下：

public class ServiceSettings : ConfigurationSection
{
    private static ServiceSettings settings;

    static ServiceSettings()
    {
        var config = 
            ConfigurationManager.OpenExeConfiguration( ConfigurationUserLevel.None );

        settings = config.GetSection( "serviceSettings" ) as ServiceSettings;
    }

    public static ServiceSettings Current { get { return settings;  } }

当我尝试访问ServiceSettings.Current时，我收到以下异常：

Application: BTR.Evolution.Service.exe  
Framework Version: v4.0.30319  
Description: The process was terminated due to an unhandled exception. 
Exception Info:    System.Configuration.ConfigurationErrorsException
    at System.Configuration.BaseConfigurationRecord.EvaluateOne(System.String[], System.Configuration.SectionInput, Boolean, System.Configuration.FactoryRecord, System.Configuration.SectionRecord, System.Object)
    at System.Configuration.BaseConfigurationRecord.Evaluate(System.Configuration.FactoryRecord, System.Configuration.SectionRecord, System.Object, Boolean, Boolean, System.Object ByRef, System.Object ByRef)
    at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(System.String, Boolean, Boolean, Boolean, Boolean, System.Object ByRef, System.Object ByRef)
    at System.Configuration.Configuration.GetSection(System.String)
    at BTR.Evolution.Service.ServiceSettings..cctor() Exception Info: System.TypeInitializationException
    at BTR.Evolution.Service.ServiceSettings.get_Current()
    at BTR.Evolution.Service.EvolutionService..ctor(System.String[])
    at BTR.Evolution.Service.Program.Main(System.String[])

第二次尝试：

我将ServiceSettings类更改为使用GetSection，如：

static ServiceSettings()
{
    settings = ConfigurationManager.GetSection( "serviceSettings" ) as ServiceSettings;
}

我得到以下异常（大部分与上面相同，但使用ConfigurationManager和更多的GetSectionRecursive调用）

Application: BTR.Evolution.Service.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: 
  System.Configuration.ConfigurationErrorsException
    at System.Configuration.BaseConfigurationRecord.EvaluateOne(System.String[], System.Configuration.SectionInput, Boolean, System.Configuration.FactoryRecord, System.Configuration.SectionRecord, System.Object)
    at System.Configuration.BaseConfigurationRecord.Evaluate(System.Configuration.FactoryRecord, System.Configuration.SectionRecord, System.Object, Boolean, Boolean, System.Object ByRef, System.Object ByRef)
    at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(System.String, Boolean, Boolean, Boolean, Boolean, System.Object ByRef, System.Object ByRef)
    at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(System.String, Boolean, Boolean, Boolean, Boolean, System.Object ByRef, System.Object ByRef)
    at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(System.String, Boolean, Boolean, Boolean, Boolean, System.Object ByRef, System.Object ByRef)
    at System.Configuration.BaseConfigurationRecord.GetSection(System.String)
    at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(System.String)
    at System.Configuration.ConfigurationManager.GetSection(System.String)
    at BTR.Evolution.Service.ServiceSettings..cctor() Exception Info: System.TypeInitializationException
    at BTR.Evolution.Service.ServiceSettings.get_Current()
    at BTR.Evolution.Service.EvolutionService..ctor(System.String[])
    at BTR.Evolution.Service.Program.Main(System.String[])

第三次尝试

我更改了ServiceSettings构造函数以尝试：

var customConfig = 
    ConfigurationManager.OpenExeConfiguration( AppDomain.CurrentDomain.SetupInformation.ConfigurationFile );

settings = customConfig.GetSection( "serviceSettings" ) as ServiceSettings;

我得到以下异常。基本上，settings变量被赋值为null（没有＆＃39;配置管理器＆＃39;异常），因此使用该对象的调用者获得null异常。

Application: BTR.Evolution.Service.exe
Framework Version: v4.0.30319 
Description: The process was terminated due to an unhandled exception. 
Exception Info: System.NullReferenceException 
    at BTR.Evolution.Service.EvolutionService..ctor(System.String[]) 
    at BTR.Evolution.Service.Program.Main(System.String[])

最终尝试

我更改了ServiceSettings构造函数以尝试使用程序集resovler。

Func<object, ResolveEventArgs, System.Reflection.Assembly> getAssembly = 
    ( sender, args ) => typeof( ServiceSettings ).Assembly;

var resolveHandler = new System.ResolveEventHandler( getAssembly );

AppDomain.CurrentDomain.AssemblyResolve += resolveHandler;

var customConfig = 
    ConfigurationManager.OpenExeConfiguration( AppDomain.CurrentDomain.SetupInformation.ConfigurationFile );

settings = customConfig.GetSection( "serviceSettings" ) as ServiceSettings;

AppDomain.CurrentDomain.AssemblyResolve -= resolveHandler;

但是我得到了与第三次尝试完全相同的结果。

任何关于如何使这项工作的建议将不胜感激。如果我需要提供任何其他信息，请告诉我。

Answer 1

嗯，有点尴尬。我根据建议使用相同的代码和设置创建了一个新的控制台应用程序，它工作所以重新检查我的Windows服务，我试图使用自定义程序集解析器来找到配置文件/部分。我假设当我最初编写服务时，我遇到了问题而且我尝试了这个自定义解析器（它仍然无效）。那是我发布这个问题的时候。但是对于它，我只回放了标准的ConfigurationManager.GetSection（上面的第二种方法）机制来获取自定义部分并且它有效。无法解释

C＃Windows服务不能将GetSection（）与自定义ConfigurationSection一起使用

1 个答案: