将企业库5迁移到6

Question

试图从企业图书馆 5.0迁移到6.0，我遇到了一些麻烦。也许这能帮到别人。

下面的配置是数据库(静默)异常日志记录的一个示例：

<configSections>
  <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging" requirePermission="true" />
  <section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling" requirePermission="true" />
</configSections>
<loggingConfiguration name="" tracingEnabled="true" defaultCategory="General">
  <listeners>
    <add name="Database Trace Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.Database.FormattedDatabaseTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging.Database"
         listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Database.Configuration.FormattedDatabaseTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging.Database"
         databaseInstanceName="LogContext" writeLogStoredProcName="WriteLog"
         addCategoryStoredProcName="AddCategory" formatter="Text Formatter" />
  </listeners>
  <formatters>
    <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging"
         template="Timestamp: {timestamp}{newline}..."
         name="Text Formatter" />
  </formatters>
  <categorySources>
    <add switchValue="All" name="Exception">
      <listeners>
        <add name="Database Trace Listener" />
      </listeners>
    </add>
  </categorySources>
</loggingConfiguration>
<exceptionHandling>
  <exceptionPolicies>
    <add name="UiPolicy">
      <exceptionTypes>
        <add name="All Exceptions" type="System.Exception, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
             postHandlingAction="None">
          <exceptionHandlers>
            <add name="Logging Exception Handler" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging.LoggingExceptionHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging"
                 logCategory="Exception" eventId="100" severity="Error" title="Enterprise Library Exception Handling"
                 formatterType="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.TextExceptionFormatter, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling"
                 priority="0" />
          </exceptionHandlers>
        </add>
      </exceptionTypes>
    </add>
  </exceptionPolicies>
</exceptionHandling>

我使用的是5.0.414.0版本的下列程序集：

Microsoft.Practices.EnterpriseLibrary.ExceptionHandling Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging Microsoft.Practices.EnterpriseLibrary.Logging Microsoft.Practices.EnterpriseLibrary.Logging.Database

使用Enterprise 5.0，在asp.net MVC应用程序中使用所有这些都非常简单：

// ...
catch (Exception ex)
{
    if (ExceptionPolicy.HandleException(ex, "UiPolicy")) throw;
    // do something else
}

将程序集升级到Enterprise 6.0后，将收到以下异常消息：

必须使用ExceptionManager方法在ExceptionPolicy类中设置SetExceptionManager。

那么，该怎么办？

Answer 1

循序渐进

为了摆脱这个异常(归功于兰迪的回答)，我们必须使用ExceptionManager，在我的例子中，通过工厂。我在global.asax的Application_Start()方法中使用了这个方法：

protected void Application_Start()
{
    IConfigurationSource source = ConfigurationSourceFactory.Create();

    var exceptionPolicyFactory = new ExceptionPolicyFactory(source);
    var exceptionManager = exceptionPolicyFactory.CreateManager();
    ExceptionPolicy.SetExceptionManager(exceptionManager);
}

但就我的处理和日志记录设置而言，这只是一半。现在我在exceptionPolicyFactory.CreateManager()得到了以下异常

尚未为Logger静态类设置LogWriter。将其设置为调用Logger.SetLogWriter方法。

为了让这件事消失，我补充道

var logwriterFactory = new LogWriterFactory(source);
var logWriter = logwriterFactory.Create();
Logger.SetLogWriter(logWriter);

现在它说

数据库提供程序工厂未为静态DatabaseFactory设置。设置调用DatabaseFactory.SetProviderFactory方法的提供程序工厂，或通过调用DatabaseFactory.SetDatabases方法指定自定义映射。

在logwriterFactory.Create()上。所以还有一件事要补充：

DatabaseFactory.SetDatabaseProviderFactory(new DatabaseProviderFactory(source));

完全解

我现在的Application_Start()是

protected void Application_Start()
{
    IConfigurationSource source = ConfigurationSourceFactory.Create();
    DatabaseFactory.SetDatabaseProviderFactory(new DatabaseProviderFactory(source));

    var logwriterFactory = new LogWriterFactory(source);
    var logWriter = logwriterFactory.Create();
    Logger.SetLogWriter(logWriter);

    var exceptionPolicyFactory = new ExceptionPolicyFactory(source);
    var exceptionManager = exceptionPolicyFactory.CreateManager();
    ExceptionPolicy.SetExceptionManager(exceptionManager);
}

当配置和实际异常处理代码保持不变时：

ExceptionPolicy.HandleException(exceptionToHandle, "UiPolicy");