NLog -如何配置为有条件地写入数据库、异常写入电子邮件和异常写入文件

<target name="database" xsi:type="Database" connectionString="数据库连接字符串" commandText="INSERT INTO LogTable (LogMessage) VALUES (@message)">
  <parameter name="@message" layout="${message}" />
</target>

<target name="email" xsi:type="Mail" to="收件人邮箱" from="发件人邮箱" subject="异常日志" smtpServer="SMTP服务器地址" smtpPort="SMTP端口号">
  <layout xsi:type="JsonLayout">
    <attribute name="message" layout="${message}" />
    <attribute name="exception" layout="${exception:format=ToString}" />
  </layout>
</target>

<target name="file" xsi:type="File" fileName="日志文件路径" layout="${longdate} ${level} ${message} ${exception:format=ToString}" />

<rules>
  <logger name="*" minlevel="Error" writeTo="database" />
  <logger name="*" minlevel="Error" writeTo="email" />
  <logger name="*" minlevel="Error" writeTo="file" />
</rules>