Question

我正在尝试使用nlog数据库目标。首先，如果我不手动创建数据库，它将无法工作。另一个更重要的是，我无法登录。我的参数布局出错了。从nlog内部日志输出：

2016-11-12 18:45:49.0479 Debug Setting 'DatabaseParameterInfo.layout' to '${logged}'
2016-11-12 18:45:49.0744 Warn Error when setting property 'Layout' on 'NLog.Targets.DatabaseParameterInfo' Exception: System.ArgumentException: LayoutRenderer cannot be found: 'logged'
   at NLog.Config.Factory`2.CreateInstance(String name)
   at NLog.Layouts.LayoutParser.ParseLayoutRenderer(ConfigurationItemFactory configurationItemFactory, SimpleStringReader sr)
   at NLog.Layouts.LayoutParser.CompileLayout(ConfigurationItemFactory configurationItemFactory, SimpleStringReader sr, Boolean isNested, String& text)
   at NLog.Layouts.SimpleLayout.set_Text(String value)
   at NLog.Internal.PropertyHelper.TryNLogSpecificConversion(Type propertyType, String value, Object& newValue, ConfigurationItemFactory configurationItemFactory)
   at NLog.Internal.PropertyHelper.SetPropertyFromString(Object obj, String propertyName, String value, ConfigurationItemFactory configurationItemFactory)
2016-11-12 18:45:49.0909 Error Error in Parsing Configuration File. Exception: NLog.NLogConfigurationException: Exception occurred when loading configuration from C:\Github\private\WeBees\WeBees Client\WeBees.Server\NLog.config ---> NLog.NLogConfigurationException: Error when setting property 'Layout' on NLog.Targets.DatabaseParameterInfo ---> System.ArgumentException: LayoutRenderer cannot be found: 'logged'
   at NLog.Config.Factory`2.CreateInstance(String name)
   at NLog.Layouts.LayoutParser.ParseLayoutRenderer(ConfigurationItemFactory configurationItemFactory, SimpleStringReader sr)
   at NLog.Layouts.LayoutParser.CompileLayout(ConfigurationItemFactory configurationItemFactory, SimpleStringReader sr, Boolean isNested, String& text)
   at NLog.Layouts.SimpleLayout.set_Text(String value)
   at NLog.Internal.PropertyHelper.TryNLogSpecificConversion(Type propertyType, String value, Object& newValue, ConfigurationItemFactory configurationItemFactory)
   at NLog.Internal.PropertyHelper.SetPropertyFromString(Object obj, String propertyName, String value, ConfigurationItemFactory configurationItemFactory)
   --- End of inner exception stack trace ---
   at NLog.Internal.PropertyHelper.SetPropertyFromString(Object obj, String propertyName, String value, ConfigurationItemFactory configurationItemFactory)
   at NLog.Config.XmlLoggingConfiguration.ConfigureObjectFromAttributes(Object targetObject, NLogXmlElement element, Boolean ignoreType)
   at NLog.Config.XmlLoggingConfiguration.AddArrayItemFromElement(Object o, NLogXmlElement element)
   at NLog.Config.XmlLoggingConfiguration.SetPropertyFromElement(Object o, NLogXmlElement element)
   at NLog.Config.XmlLoggingConfiguration.ParseTargetElement(Target target, NLogXmlElement targetElement)
   at NLog.Config.XmlLoggingConfiguration.ParseTargetsElement(NLogXmlElement targetsElement)
   at NLog.Config.XmlLoggingConfiguration.ParseNLogElement(NLogXmlElement nlogElement, String filePath, Boolean autoReloadDefault)
   at NLog.Config.XmlLoggingConfiguration.ParseTopLevel(NLogXmlElement content, String filePath, Boolean autoReloadDefault)
   at NLog.Config.XmlLoggingConfiguration.Initialize(XmlReader reader, String fileName, Boolean ignoreErrors)
   --- End of inner exception stack trace ---

我的nlog.config

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" 
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      internalLogFile="C:\Github\private\WeBees\WeBees Client\WeBees.Server\Logs\nlog.txt" internalLogLevel="Trace">
  <targets>
    <target name="logfile" xsi:type="File" fileName="C:\Github\private\WeBees\WeBees Client\WeBees.Server\Logs\log.txt" />
    <target xsi:type="ColoredConsole" name="console" />
    <target name="database" xsi:type="Database">
      <!--
  Remarks:
    The appsetting layouts require the NLog.Extended assembly.
    The aspnet-* layouts require the NLog.Web assembly.
    The Application value is determined by an AppName appSetting in Web.config.
    The "NLogDb" connection string determines the database that NLog write to.
    The create dbo.Log script in the comment below must be manually executed.
  -->

      <connectionStringName>dev</connectionStringName>

      <!--
  SET ANSI_NULLS ON
  SET QUOTED_IDENTIFIER ON
  CREATE TABLE [dbo].[Log] (
      [Id] [int] IDENTITY(1,1) NOT NULL,
      [Application] [nvarchar](50) NOT NULL,
      [Logged] [datetime] NOT NULL
    CONSTRAINT [PK_dbo.Log] PRIMARY KEY CLUSTERED ([Id] ASC)
      WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
  ) ON [PRIMARY]
  -->

      <commandText>
        insert into dbo.Log (
        Application, Logged
        ) values (
        @Application, @Logged
        );
      </commandText>

      <parameter name="@application" layout="dadasda" />
      <parameter name="@logged" layout="${logged}" />
    </target>
  </targets>
  <rules>
    <logger name="*" minlevel="Info" writeTo="logfile,console" />
  </rules>
</nlog>

如果我手动创建表并将常量放在布局中，就像'application'参数一样。它可以工作。

我按照文档进行操作，但是无法使其正常工作。我有NLog＆amp;已安装NLog.Web扩展。

提前致谢！

Answer 1

正如错误消息所示，您应该定义${logged}，例如在配置文件中：

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" 
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      internalLogFile="C:\Github\private\WeBees\WeBees Client\WeBees.Server\Logs\nlog.txt" internalLogLevel="Trace">

  <variable name="logged" value="my var" />
  <targets>

或者将其替换为其他布局渲染器，例如${message}，请参阅list of possible layout renderers

关于表的创建，如果您提供安装查询，NLog将只创建表：

<target xsi:type="Database" name="db">

  <!-- connection string -->
  <dbProvider>System.Data.SqlClient</dbProvider>
  <connectionString>server=.\SQLEXPRESS;database=MyLogs;integrated security=sspi</connectionString>

  <!-- commands to install database -->
  <install-command>
    <text>CREATE DATABASE MyLogs</text>
    <connectionString>server=.\SQLEXPRESS;database=master;integrated security=sspi</connectionString>
    <ignoreFailures>true</ignoreFailures>
  </install-command>

  <install-command>
    <text>
      CREATE TABLE LogEntries(
      id int primary key not null identity(1,1),
      TimeStamp datetime2,
      Message nvarchar(max),
      level nvarchar(10),
      logger nvarchar(128))
    </text>

并调用install，c＃：

LogManager.Configuration.Install(new InstallationContext()); //install all the targets, e.g. database, eventlogger etc.

nlog数据库目标参数布局错误

1 个答案: