.Net Core 3.1 log4net ADONetAppender自定义数据库列

分类：编程问答

如何解决.Net Core 3.1 log4net ADONetAppender自定义数据库列

我正在尝试使用AdoNetAppender在.net core 3.1 Web应用程序中实现log4net。 我正在将 MicroKnights.Log4NetAdoNetAppender nuget与 System.Data.SqlClient.SqlConnection，System.Data.SqlClient nuget一起使用，并且一切正常。

当我想创建一个自定义列以保存生成日志的应用程序源的编号时，就会出现问题。

配置文件是这样的。

<?xml version="1.0" encoding="utf-8" ?>
<log4net debug="true">
    <root>
        <level value="ALL" />
        <appender-ref ref="ADONetAppender" />
    </root>

    <appender name="ADONetAppender" type="MicroKnights.Logging.AdoNetAppender,MicroKnights.Log4NetAdoNetAppender">
        <bufferSize value="1" />
        <connectionType value="System.Data.SqlClient.SqlConnection,System.Data.SqlClient,Version=4.0.0.0,Culture=neutral,PublicKeyToken=b77a5c561934e089" />
        <connectionString value="My-conextion-string" />
        <commandText value="insert into LogItem(LogItemNumber,LogItemDate,LogItemTimeStamp,LogItemSource,LogItemThread,LogItemLevel,LogItemLogger,LogItemMessage,LogItemException) values (@logItemNumber,@logItemDate,@logItemTimeStamp,@logItemSource,@logItemThread,@logItemLevel,@logItemLogger,@logItemMessage,@logItemException)" />
        <parameter>
            <parameterName value="@logItemNumber" />
            <dbType value="String" />
            <size value="255" />
            <layout type="log4net.Layout.PatternLayout">
                <param name="%logcounter"/>
                <converter>
                    <name value="%logcounter" />
                    <type value="NotificacionProgramadaWS.Utilidades.LogCounterPatternConverter" />
                </converter>
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@logItemDate" />
            <dbType value="DateTime" />
            <layout type="log4net.Layout.RawTimeStampLayout" />
        </parameter>
        <parameter>
            <parameterName value="@logItemTimeStamp" />
            <dbType value="Int64" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%timestamp" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@logItemSource" />
            <dbType value="String" />
            <size value="255" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%logcounter" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@logItemThread" />
            <dbType value="String" />
            <size value="255" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%thread" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@logItemLevel" />
            <dbType value="String" />
            <size value="50" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%level" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@logItemLogger" />
            <dbType value="String" />
            <size value="255" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%logger" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@logItemMessage" />
            <dbType value="String" />
            <size value="8000" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%message" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@logItemException" />
            <dbType value="String" />
            <size value="8000" />
            <layout type="log4net.Layout.ExceptionLayout" />
        </parameter>
    </appender>
</log4net>

我正在使用转换器生成附加列的内容，并且它不生成数据。我的转换器就是这样。

public sealed class LogCounterPatternConverter : PatternLayoutConverter
{
    private static int LogCounter;
    protected override void Convert(TextWriter writer,LoggingEvent loggingEvent)
    {
        writer.Write(LogCounter.ToString(CultureInfo.InvariantCulture));
        LogCounter++;
    }
}

我还使用了其他类似如下的方法，但是它仍然不起作用

public class LogCounterPatternConverter : PatternConverter
{
    private static int _logCounter;
    protected override void Convert(TextWriter writer,object state)
    {
        writer.Write(_logCounter.ToString(CultureInfo.InvariantCulture));
        _logCounter++;
    }
}

public class LogCounterPatternLayout : PatternLayout
{
    public LogCounterPatternLayout()
    {
        AddConverter(new ConverterInfo
        {
            Name = "logCounter",Type = typeof(LogCounterPatternConverter)
        });
    }
}

运行应用程序时显示的错误如下

log4net: Configuration update mode [Merge].
log4net: Logger [root] Level string is [ALL].
log4net: Logger [root] level set to [name="ALL",value=-2147483648].
log4net:ERROR XmlHierarchyConfigurator: No appender named [RollingLogFileAppender] could be found.
log4net:ERROR Appender named [RollingLogFileAppender] not found.
log4net: Loading Appender [ADONetAppender] type: [MicroKnights.Logging.AdoNetAppender,MicroKnights.Log4NetAdoNetAppender]
log4net: Setting Property [BufferSize] to Int32 value [1]
log4net: Setting Property [ConnectionType] to String value [System.Data.SqlClient.SqlConnection,PublicKeyToken=b77a5c561934e089]
log4net: Setting Property [ConnectionString] to String value [Server=JAIROJIM;Database=Log4netDb;User Id=UsuarioUdla;Password=123]
log4net: Setting Property [CommandText] to String value [insert into LogItem(LogItemNumber,@logItemException)]
log4net: Setting Property [ParameterName] to String value [@logItemNumber]
log4net: Setting Property [DbType] to DbType value [String]
log4net: Setting Property [Size] to Int32 value [255]
log4net: Converter [message] Option [] Format [min=-1,max=2147483647,leftAlign=False]
log4net: Converter [newline] Option [] Format [min=-1,leftAlign=False]
log4net:ERROR XmlHierarchyConfigurator: Cannot find Property [%logcounter] to set object on [log4net.Layout.PatternLayout]
log4net: Setting Property [Name] to String value [%logcounter]
log4net:ERROR Could not create Appender [ADONetAppender] of type [MicroKnights.Logging.AdoNetAppender,MicroKnights.Log4NetAdoNetAppender]. Reported error follows.
System.TypeLoadException: Could not load type 'NotificacionProgramadaWS.Utilidades.LogCounterPatternConverter' from assembly 'log4net,Version=2.0.8.0,PublicKeyToken=669e0ddf0bb1aa2a'.
   at System.Reflection.RuntimeAssembly.GetType(QCallAssembly assembly,String name,Boolean throwOnError,Boolean ignoreCase,ObjectHandleOnStack type,ObjectHandleOnStack keepAlive,ObjectHandleOnStack assemblyLoadContext)
   at System.Reflection.RuntimeAssembly.GetType(String name,Boolean ignoreCase)
   at log4net.Util.SystemInfo.GetTypeFromString(Assembly relativeAssembly,String typeName,Boolean ignoreCase)
   at log4net.Util.TypeConverters.TypeConverter.ConvertFrom(Object source)
   at log4net.Util.OptionConverter.ConvertStringTo(Type target,String txt)
   at log4net.Repository.Hierarchy.XmlHierarchyConfigurator.ConvertStringTo(Type type,String value)
   at log4net.Repository.Hierarchy.XmlHierarchyConfigurator.SetParameter(XmlElement element,Object target)
   at log4net.Repository.Hierarchy.XmlHierarchyConfigurator.CreateObjectFromXml(XmlElement element,Type defaultTargetType,Type typeConstraint)
   at log4net.Repository.Hierarchy.XmlHierarchyConfigurator.SetParameter(XmlElement element,Object target)
   at log4net.Repository.Hierarchy.XmlHierarchyConfigurator.ParseAppender(XmlElement appenderElement)
log4net:ERROR Appender named [ADONetAppender] not found.
log4net: Hierarchy Threshold []
log4net: No appenders could be found for logger [Microsoft.Extensions.Hosting.Internal.Host] repository [log4net-default-repository]
log4net: Please initialize the log4net system properly.
log4net:     Current AppDomain context information:
log4net:        BaseDirectory   : Y:\NotificacionesPushCenturylink.Backend\ServicioNotificacionesCenturylink\NotificacionProgramadaWS

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