log4net ADO.NET Appender适用于Dev Fabric,但在Azure上无声地失

使用此文件在代码中进行配置：

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
  <renderer renderingClass="{ExceptionRenderer}" renderedClass="System.Exception" />
  <appender name="TraceAppender" type="log4net.Appender.TraceAppender">
    <layout type="log4net.Layout.PatternLayout">
      <!--<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />-->
      <conversionPattern value="%message%newline" />
    </layout>
  </appender>
  <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
    <bufferSize value="3" />
    <connectionType value="{ConnectionType}" />
    <connectionString value="{ConnectionString}" />
    <commandText value="INSERT INTO Salescast_Log ([Date],[Thread],[Version],[Level],[Logger],[Message],[Exception]) VALUES (@log_date,@thread,'{Version}',@log_level,@logger,@message,@exception)" />
    <parameter>
      <parameterName value="@log_date" />
      <dbType value="DateTime" />
      <layout type="log4net.Layout.RawTimeStampLayout" />
    </parameter>
    <parameter>
      <parameterName value="@thread" />
      <dbType value="String" />
      <size value="255" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%thread" />
      </layout>
    </parameter>
    <parameter>
      <parameterName value="@log_level" />
      <dbType value="String" />
      <size value="50" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%level" />
      </layout>
    </parameter>
    <parameter>
      <parameterName value="@logger" />
      <dbType value="String" />
      <size value="255" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%logger" />
      </layout>
    </parameter>
    <parameter>
      <parameterName value="@message" />
      <dbType value="String" />
      <size value="4000" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%message" />
      </layout>
    </parameter>
    <parameter>
      <parameterName value="@exception" />
      <dbType value="String" />
      <size value="4000" />
      <layout type="{ExceptionLayoutType}" />
    </parameter>
    <filter type="log4net.Filter.LevelRangeFilter">
      <levelMin value="ERROR" />
      <levelMax value="FATAL" />
    </filter>
  </appender>
  <root>
    <level value="DEBUG" />
    <appender-ref ref="TraceAppender" />
    <appender-ref ref="AdoNetAppender" />
  </root>
</log4net>

当Autofac IoC环境初始化时(每个角色启动),log4net使用适当的值进行初始化.代码如下所示：

static ILogProvider BuildProvider(IComponentContext context)
{
  var connection = context
    .Resolve<IProvideBusSettings>()
    .GetString("SqlConnection")
    .ExposeException("Failed to get SQL string for logging");

  var xml = Properties.Resources.Logging
    .Replace("{ConnectionType}",typeof(SqlConnection).AssemblyQualifiedName)
    .Replace("{ConnectionString}",connection)
    .Replace("{ExceptionLayoutType}",typeof(LoggingTrimmedExceptionLayout).AssemblyQualifiedName)
    .Replace("{ExceptionRenderer}",typeof(LoggingExceptionRenderer).AssemblyQualifiedName)
    .Replace("{Version}",SystemDescriptor.Default.Version.ToString());

  var doc = new XmlDocument();
  doc.LoadXml(xml);
  XmlConfigurator.Configure(doc.DocumentElement);
  return new LoggingProvider();
}

使用默认Azure OS. SQL连接显然是有效的.

请问任何人,想一想原因,为什么log4net会从开发结构中记录错误,但是使用完全相同的服务配置文件却无法从azure OS中执行此操作？

解决方法

尝试在连接到SQL Azure时使用SQL Server Management Studio执行手动插入语句,如果这是问题,它会立即告诉您.如果是这样,请运行以下SQL以在表上添加聚簇索引(假设您使用了log4net中的SQL直接),然后再次尝试.

CREATE UNIQUE CLUSTERED INDEX PK_Log ON [Log]
  ([Id])
GO

（编辑：李大同）

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