学步园

<configuration>
  <system.diagnostics>
    <sources>
      <source name="TraceSourceApp" switchName="sourceSwitch" switchType="System.Diagnostics.SourceSwitch"> //switchValue="Warning" 也可以在此处直接指定switch的值
        <listeners>
          <add name="console" type="System.Diagnostics.ConsoleTraceListener">
            <filter type="System.Diagnostics.EventTypeFilter" initializeData="Warning"/>
          </add>
          <add name="myListener"/>
          <remove name="Default"/>
        </listeners>
      </source>
    </sources>
    <switches>
      <add name="sourceSwitch" value="Warning"/>
    </switches>
    <sharedListeners>
      <add name="myListener" type="System.Diagnostics.TextWriterTraceListener" initializeData="myListener.log">
        <filter type="System.Diagnostics.EventTypeFilter" initializeData="Error"/>
      </add>
    </sharedListeners> <trace autoflush="true" indentsize="4">
      <listeners>
        <add name="myListener" />
      </listeners>
    </trace>
  </system.diagnostics>
</configuration>

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