我正在尝试让NLog写入数据库,但是当我尝试调试时,我的当前代码会引发异常,例外是:'NotifyIcon.Program'的类型初始化程序引发异常。
我的NLog配置文件代码如下,因为这似乎是导致问题,因为它是我改变的唯一代码。
<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" autoReload="true">
<!--
See http://nlog-project.org/wiki/Configuration_file
for information on customizing logging rules and outputs.
-->
<targets>
<!-- add your targets here -->
<target name="database" xsi:type="Database" />
<target xsi:type="Database"
name="String"
dbUserName="Layout"
dbProvider="sqlserver"
useTransactions="false"
connectionStringName="String"
connectionString="Data Source=AC-02\SQLEXPRESS;Initial Catalog=master;Integrated Security=True"
keepConnection="true"
dbDatabase="Layout"
dbPassword="Layout"
dbHost="Layout"
installConnectionString="Layout"
commandText="INSERT INTO Logs (Machine_Name, Username, Logon_Time, Screensaver_On, Screensaver_Off, Logoff_Time, Program_Start) Values @MachineName, @Username, @LogonTime, @Screensaver_On, @Screensaver_Off, @LogoffTime, @ProgramStart "/>
</targets>
<rules>
<logger name="*" minlevel="Trace" writeTo="database" />
</rules>
</nlog>
任何和所有帮助将不胜感激=]
答案 0 :(得分:13)
您似乎缺少要插入的参数。
请参阅http://justinpdavis.blogspot.com/2010/04/logging-to-database-with-nlog.html
上的示例nLog网页并不十分清楚这些是必需的,但是如果你眯着眼睛看了https://github.com/nlog/NLog/wiki/Database-target,你会发现它们是必需的。
答案 1 :(得分:1)
看起来您的插入字符串格式不正确?你在参数列表周围缺少()。
commandText="INSERT INTO Logs (Machine_Name, Username, Logon_Time, Screensaver_On, Screensaver_Off, Logoff_Time, Program_Start) Values (@MachineName, @Username, @LogonTime, @Screensaver_On, @Screensaver_Off, @LogoffTime, @ProgramStart) "
答案 2 :(得分:1)
<target name="DbLog" xsi:type="Database" connectionString="YourConStr"
commandText="insert into [blablablabal] (Col1) values (@val1)">
<parameter name="@val1" layout="${level}" /></target>
像这样的东西。容易没? :)
答案 3 :(得分:1)
一个简单的例子,
配置:
<target type="Database" name="database" connectionstring="Server=localhost;Database=NLog;Trusted_Connection=True;">
<commandText>
INSERT INTO NLogEntries ([Origin], [Message], [LogLevel],[CreatedOn],[OrderId]) VALUES (@Origin,@Message,@LogLevel,@Date, @OrderId);
</commandText>
<parameter name="@Date" layout="${date}" dbType="DbType.Date"/>
<parameter name="@Origin" layout="${callsite}"/>
<parameter name="@LogLevel" layout="${level}"/>
<parameter name="@message" layout="${message}"/>
<parameter name="@OrderId" layout="${event-properties:MyOrderId}" dbType="DbType.Int32"/> <!-- custom field! Note also the DB Type. Using Logger.WithProperty -->
</target>
注意,NLog 4.6还支持DbType-请参见https://nlog-project.org/2019/03/20/nlog-4-6-is-live.html