尝试获取类型日志写，关键和QUOT的实例激活出错;"？ [英] Activation error occured while trying to get instance of type LogWriter, key ""?

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问题描述

我有asp.net网站。我加了 Microsoft.P​​ractices.EnterpriseLibrary.Logging.dll 的参考网站。

I have asp.net web site. I added reference of Microsoft.Practices.EnterpriseLibrary.Logging.dll to the site.

在web.cofig文件中，我定义如下图所示。

in web.cofig file, I defined like below. 

    <?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
  </configSections>
  <loggingConfiguration name="Logging Application Block" tracingEnabled="true"
    defaultCategory="General" logWarningsWhenNoCategoriesMatch="true">
    <listeners>
      <add name="Rolling Flat File Trace Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging"
        listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging"
        fileName="C:\Temp\RollingFlatFile.log" footer="----------------------------------------"
        formatter="Text Formatter" header="----------------------------------------"
        rollFileExistsBehavior="Increment" rollInterval="None" rollSizeKB="20"
        timeStampPattern="yyyy-MM-dd" maxArchivedFiles="3" traceOutputOptions="None"
        filter="All" />
      </listeners>
    <formatters>
      <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging"
        template="Timestamp: {timestamp(local)}{tab}Message: {message}{tab}Category: {category}{tab}Priority: {priority}{tab}EventId: {eventid}{tab}ActivityId: {property(ActivityId)}{tab}Severity: {severity}{tab}Title:{title}{tab}"
        name="Brief Format Text" />
      <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging"
        template="Timestamp: {timestamp}{tab}Message: {message}{tab}Category: {category}{tab}Priority: {priority}{tab}EventId: {eventid}{tab}Severity: {severity}{tab}Title: {title}{tab}Activity ID: {property(ActivityId)}{tab}Machine: {localMachine}{tab}App Domain: {localAppDomain}{tab}ProcessId: {localProcessId}{tab}Process Name: {localProcessName}{tab}Thread Name: {threadName}{tab}Win32 ThreadId:{win32ThreadId}{tab}Extended Properties: {dictionary({key} - {value}{tab})}"
        name="Text Formatter" />
    </formatters>
    <logFilters>
      <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Filters.PriorityFilter, Microsoft.Practices.EnterpriseLibrary.Logging"
        minimumPriority="2" maximumPriority="99" name="Priority Filter" />
      <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Filters.LogEnabledFilter, Microsoft.Practices.EnterpriseLibrary.Logging"
        enabled="true" name="LogEnabled Filter" />
      <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Filters.CategoryFilter, Microsoft.Practices.EnterpriseLibrary.Logging"
        categoryFilterMode="AllowAllExceptDenied" name="Category Filter">
        <categoryFilters>
          <add name="BlockedByFilter" />
        </categoryFilters>
      </add>
    </logFilters>
    <categorySources>
      <add switchValue="All" name="Important">
        <listeners>
          <add name="Formatted EventLog TraceListener" />
          <add name="Rolling Flat File Trace Listener" />
        </listeners>
      </add>
    </categorySources>
    <specialSources>
      <allEvents switchValue="All" name="All Events" />
      <notProcessed switchValue="All" name="Unprocessed Category">
        <listeners>
          <add name="UnprocessedFlatFile" />
        </listeners>
      </notProcessed>
      <errors switchValue="All" name="Logging Errors &amp; Warnings">
        <listeners>
          <add name="Formatted EventLog TraceListener" />
        </listeners>
      </errors>
    </specialSources>
  </loggingConfiguration>
</configuration>

当我运行代码的异常发生下面的地方。

When I run the code exception happening below place.

defaultWriter = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
//Activation error occured while trying to get instance of type LogWriter, key ""



如何解决此问题？

How to resolve this?

推荐答案

您全面配置引用跟踪未定义的听众。这导致企业库运行时，它试图解决这些引用抛出一个运行时异常。

Your full config references trace listeners that are not defined. This is causing the Enterprise Library runtime to throw a runtime exception when it tries to resolve those references.

我注释掉未使用的监听器（和更改默认类别重要），它是工作：

I commented out the unused listeners (and changed the default category to Important) and it is working:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
    </configSections>
    <loggingConfiguration name="Logging Application Block" tracingEnabled="true"
      defaultCategory="Important" logWarningsWhenNoCategoriesMatch="true">
        <listeners>
            <add name="Rolling Flat File Trace Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging"
              listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging"
              fileName="C:\Temp\RollingFlatFile.log" footer="----------------------------------------"
              formatter="Text Formatter" header="----------------------------------------"
              rollFileExistsBehavior="Increment" rollInterval="None" rollSizeKB="20"
              timeStampPattern="yyyy-MM-dd" maxArchivedFiles="3" traceOutputOptions="None"
              filter="All" />
        </listeners>
        <formatters>
            <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging"
              template="Timestamp: {timestamp(local)}{tab}Message: {message}{tab}Category: {category}{tab}Priority: {priority}{tab}EventId: {eventid}{tab}ActivityId: {property(ActivityId)}{tab}Severity: {severity}{tab}Title:{title}{tab}"
              name="Brief Format Text" />
            <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging"
              template="Timestamp: {timestamp}{tab}Message: {message}{tab}Category: {category}{tab}Priority: {priority}{tab}EventId: {eventid}{tab}Severity: {severity}{tab}Title: {title}{tab}Activity ID: {property(ActivityId)}{tab}Machine: {localMachine}{tab}App Domain: {localAppDomain}{tab}ProcessId: {localProcessId}{tab}Process Name: {localProcessName}{tab}Thread Name: {threadName}{tab}Win32 ThreadId:{win32ThreadId}{tab}Extended Properties: {dictionary({key} - {value}{tab})}"
              name="Text Formatter" />
        </formatters>
        <logFilters>
            <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Filters.PriorityFilter, Microsoft.Practices.EnterpriseLibrary.Logging"
              minimumPriority="2" maximumPriority="99" name="Priority Filter" />
            <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Filters.LogEnabledFilter, Microsoft.Practices.EnterpriseLibrary.Logging"
              enabled="true" name="LogEnabled Filter" />
            <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Filters.CategoryFilter, Microsoft.Practices.EnterpriseLibrary.Logging"
              categoryFilterMode="AllowAllExceptDenied" name="Category Filter">
                <categoryFilters>
                    <add name="BlockedByFilter" />
                </categoryFilters>
            </add>
        </logFilters>
        <categorySources>
            <add switchValue="All" name="Important">
                <listeners>
                    <!--<add name="Formatted EventLog TraceListener" />-->
                    <add name="Rolling Flat File Trace Listener" />
                </listeners>
            </add>
        </categorySources>
        <specialSources>
            <allEvents switchValue="All" name="All Events" />
            <notProcessed switchValue="All" name="Unprocessed Category">
                <listeners>
                    <!--<add name="UnprocessedFlatFile" />-->
                </listeners>
            </notProcessed>
            <errors switchValue="All" name="Logging Errors &amp; Warnings">
                <listeners>
                    <!--<add name="Formatted EventLog TraceListener" />-->
                </listeners>
            </errors>
        </specialSources>
    </loggingConfiguration>
</configuration>



线索是在内部异常。在 InnerException.Message 它说的末尾：

解决System.Diagnostics程序.TraceListener，格式化事件日志
的TraceListener

Resolving System.Diagnostics.TraceListener,Formatted EventLog TraceListener

以上配置在App.config中。然后Program.cs中包含：

The above config is in app.config. Then Program.cs contains:

class Program
{
    static void Main(string[] args)
    {
        LogWriter logWriter = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
        logWriter.Write("Test");
     }
}

这篇关于尝试获取类型日志写，关键和QUOT的实例激活出错;&QUOT;？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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