Question

我正在尝试构建一个使用Enterprise Library 5.0 Logging Code Block的日志库，我已经能够创建一个CustomTraceListener，当配置来自配置文件但我尝试通过配置进行配置时Source Builder我收到以下错误：

"Unable to find appropriate 0 argument constructor for CustomTraceListener"

当我尝试使用EL5.0代码库查找错误时，特别是在为CustomTraceListenerData构建构造字符串时遇到问题。

以下是代码：

using System;
using Microsoft.Practices.EnterpriseLibrary.Logging;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
using Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners;
using Microsoft.Practices.EnterpriseLibrary.Logging.Configuration;
using System.Diagnostics;
using Microsoft.Practices.EnterpriseLibrary.Logging.Formatters;

namespace AHCALoggerLibrary
{
[ConfigurationElementType(typeof(CustomTraceListenerData))]
public class ServiceTraceListener : CustomTraceListener
{
    public ServiceTraceListener()
        : base() {}

    public override void TraceData(System.Diagnostics.TraceEventCache eventCache, string source, System.Diagnostics.TraceEventType eventType, int id, object data)
    {
        base.TraceData(eventCache, source, eventType, id, data);
    }

    public override void TraceData(System.Diagnostics.TraceEventCache eventCache, string source, System.Diagnostics.TraceEventType eventType, int id, params object[] data)
    {
        base.TraceData(eventCache, source, eventType, id, data);
    }

    public override void Write(string message)
    {
        throw new NotImplementedException();
    }

    public override void WriteLine(string message)
    {
        throw new NotImplementedException();
    }
}

public class AHCALogger
{
    private static AHCALogger _logger = new AHCALogger();

    private LogWriter _Service = null; 

    public static LogWriter Service { get { return _logger._Service;} }

    private AHCALogger() { }

    public static void Init()
    {
        var builder = new ConfigurationSourceBuilder();

        builder.ConfigureLogging()
               .WithOptions
                 .DoNotRevertImpersonation()
               .LogToCategoryNamed("General")
                .WithOptions.SetAsDefaultCategory()
                    .SendTo.Custom<CustomTraceListener>("ServiceTraceListener")
                   .FormatWith(new FormatterBuilder()
                     .TextFormatterNamed("Text Formatter")
                       .UsingTemplate("Timestamp: {timestamp}...{newline})}"))
                 .SendTo.EventLog("Formatted EventLog TraceListener")
                    .FormatWithSharedFormatter("Text Formatter")
                      .ToLog("Application");

        var configSource = new DictionaryConfigurationSource();
        builder.UpdateConfigurationWithReplace(configSource);
        EnterpriseLibraryContainer.Current = EnterpriseLibraryContainer.CreateDefaultContainer(configSource);
        _logger._Service = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
    }
}
}

然后使用记录器：

        AHCALogger.Init();
        AHCALogger.Service.Write("hello");

我怀疑我配置错误，因为当我使用配置文件设置并调用时它确实有效：

LogWriter ahcaLogger = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
ahcaLogger.Write("hello");

我试图找到有关如何使用ConfigurationSourceBuilder的更多信息，但无济于事。

任何人都可以帮我吗？

Answer 1

您需要替换

.SendTo.Custom<CustomTraceListener>("ServiceTraceListener")

带

 .SendTo.Custom<ServiceTraceListener>("ServiceTraceListener")

错误消息告诉您基本上无法实例化抽象类。你需要传递具体的课程。你不需要[ConfigurationElementType（typeof（CustomTraceListenerData））]因为它没有效果。

要将自定义配置数据传递给跟踪侦听器，您需要知道数据存储在TraceListener基类的Attributes集合中。这意味着您无法在第一次日志调用时初始化ctor中的侦听器。

我已经清理了一些静态记录器，以使其更容易。

我在调试这个烦人的 SynchronizationLockException

时注意到了

“从非同步的代码块调用了对象同步方法。”

在Entlib5 yuck 中似乎是bug。除了自己重新编译并修复它之外，我还没有找到解决方法。

以下是包含自定义数据的工作记录器的代码。

using System;
using Microsoft.Practices.EnterpriseLibrary.Logging;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
using Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners;
using System.Linq;
using System.Collections.Specialized;
using Microsoft.Practices.EnterpriseLibrary.Logging.Configuration;

class Program
{
    static void Main(string[] args)
    {
        AHCALogger.Service.Write(new LogEntry() { Message = "Hi" });
    }
}

public static class AHCALogger
{
    static Lazy<LogWriter> _Service = new Lazy<LogWriter>(Init);
    public static LogWriter Service
    {
        get { return _Service.Value; }
    }

    static LogWriter Init()
    {
        var builder = new ConfigurationSourceBuilder();
        var serviceConfig = new NameValueCollection();
        serviceConfig.Add("Key", "data");
        builder.ConfigureLogging()
            .LogToCategoryNamed("General")
            .WithOptions.SetAsDefaultCategory()
            .SendTo.Custom<ServiceTraceListener>("ServiceTraceListener", serviceConfig);

        var configSource = new DictionaryConfigurationSource();
        configSource.Add(LoggingSettings.SectionName, builder.Get(LoggingSettings.SectionName));
        var cont = EnterpriseLibraryContainer.CreateDefaultContainer(configSource);
        return cont.GetInstance<LogWriter>();
    }
}

public class ServiceTraceListener : CustomTraceListener
{
    public ServiceTraceListener() { }
    public override void Write(string message)
    {
        Console.WriteLine("Custom trace Listener Data {0}", 
            String.Join(Environment.NewLine, base.Attributes.Keys.OfType<string>().Select(key => "[" + key + "]: " + base.Attributes[key])));
        Console.WriteLine("message: {0}", message);
    }
    public override void WriteLine(string message) 
    {
        Write(message + Environment.NewLine);
    }
}

Enterprise Library 5.0使用CustomTraceListener和ConfigurationSourceBuilder进行日志记录

1 个答案: