我正在使用一个自定义的 ADONetAppender，它定义了基本参数、Date、Thread、Level 等，但也使用了一个自定义的 Parameter appender。似乎在我的 Win 7 开发机器上，运行 SQL Server 2008 R2，它工作正常，并且添加了特殊参数，该参数与位列绑定并且是必需的（不为空）。
在 Win Server 2003 机器上运行该服务时（尝试了一个运行 SQL Server 2005，另一个运行 2008 R2），log4net 无法将日志附加到数据库，但我的其他附加程序工作。我知道 log4net 有内部调试，但这是运行服务，所以我无权访问控制台。不同版本的 Windows 是否存在兼容性问题，或其他一些建议的调试操作？
如果我要删除额外的参数，则日志将写入数据库。
<log4net>
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
<param name="File" value="C:\Logs\Log.txt" />
<param name="AppendToFile" value="true" />
<param name="ImmediateFlush" value="true" />
<layout type="log4net.Layout.PatternLayout">
<param name="Header" value="[Header]
" />
<param name="Footer" value="[Footer]
" />
<param name="ConversionPattern" value="%d [%t] %-5p %c %m%n" />
</layout>
</appender>
<appender name="ADONetAppender" type="log4net.Appender.ADONetAppender">
<bufferSize value="1"/>
<connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<connectionString value="Data Source=localhost\SQLEXPRESS;Initial Catalog=mydb;Integrated Security=True"/>
<commandText value="INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[Exception],[IsCritical]) VALUES
 (@log_date, @thread, @log_level, @logger, @message,
@exception, @is_critical)"
/>
<parameter>
<parameterName value="@log_date"/>
<dbType value="DateTime"/>
<layout type="log4net.Layout.RawUtcTimeStampLayout"/>
</parameter>
<parameter>
<parameterName value="@thread"/>
<dbType value="String"/>
<size value="32"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%t"/>
</layout>
</parameter>
<parameter>
<parameterName value="@log_level"/>
<dbType value="String"/>
<size value="512"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%p"/>
</layout>
</parameter>
<parameter>
<parameterName value="@logger"/>
<dbType value="String"/>
<size value="512"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%c"/>
</layout>
</parameter>
<parameter>
<parameterName value="@message"/>
<dbType value="String"/>
<size value="4000"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%m"/>
</layout>
</parameter>
<parameter>
<parameterName value="@exception"/>
<dbType value="String"/>
<size value="2000"/>
<layout type="log4net.Layout.ExceptionLayout"/>
</parameter>
<parameter type="MyApp.Logging.IsCriticalAdoNetParameter">
<parameterName value="@is_critical"/>
<dbType value="Boolean"/>
<size value="10"/>
<layout type="log4net.Layout.PatternLayout" value=""/>
</parameter>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="LogFileAppender" />
<appender-ref ref="ADONetAppender"/>
</root>
</log4net>
自定义参数：
public class IsCriticalAdoNetParameter : AdoNetAppenderParameter
{
public override void FormatValue(IDbCommand command, LoggingEvent loggingEvent)
{
// Lookup the parameter
IDbDataParameter param = (IDbDataParameter)command.Parameters[ParameterName];
// extension method, returns bool.
param.Value = loggingEvent.IsCritical();
}
}
更新，使用具有相同日志记录部分的小型控制台应用程序进行了一些调试。它似乎在列名上爆炸了。这似乎暗示该列不存在，但确实存在。我想知道将布尔值转换为实际的 SQL 数据类型是否存在问题？
log4net: XmlHierarchyConfigurator: Setting Property [Layout] to object [log4net.
Layout.Layout2RawLayoutAdapter]
log4net: XmlHierarchyConfigurator: Setting Collection Property [AddParameter] to
object [log4net.Appender.AdoNetAppenderParameter]
log4net: SystemInfo: Loaded type [MyApp.Logging.IsCriticalAdoNetPar
ameter] from assembly [MyApp, Version=2.0.0.2929, Culture=neutral,
PublicKeyToken=null] by searching loaded assemblies.
log4net: XmlHierarchyConfigurator: Setting Property [ParameterName] to String va
lue [@is_critical]
log4net: XmlHierarchyConfigurator: Setting Property [DbType] to DbType value [Bo
olean]
log4net: XmlHierarchyConfigurator: Setting Property [Size] to Int32 value [1]
log4net: XmlHierarchyConfigurator: Parameter [layout] specified subtype [log4net
.Layout.PatternLayout]
log4net: XmlHierarchyConfigurator: Performing additional conversion of value fro
m [PatternLayout] to [IRawLayout]
log4net: XmlHierarchyConfigurator: Setting Property [Layout] to Layout2RawLayout
Adapter value [log4net.Layout.Layout2RawLayoutAdapter]
log4net: XmlHierarchyConfigurator: Setting Collection Property [AddParameter] to
object [MyApp.Logging.IsCriticalAdoNetParameter]
log4net: XmlHierarchyConfigurator: Created Appender [ADONetAppender]
log4net: XmlHierarchyConfigurator: Adding appender named [ADONetAppender] to log
ger [root].
log4net: XmlHierarchyConfigurator: Hierarchy Threshold []
log4net:ERROR [AdoNetAppender] Exception while writing to database
System.Data.SqlClient.SqlException (0x80131904): Invalid column name 'IsCritical
'.
Statement(s) could not be prepared.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolea
n breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception
, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()