Value from the App Settings configuration

From NLog 3.0+, in NLog.Extended

##Configuration Syntax

${appsetting:name=String:default=String}

##Parameters ###Rendering Options

• name - Key in the apps setting. Required.
• Default - Default value if not present. Optional.

##Example Example .config

<configuration>
    <appSettings>
        <add key="MyKey" value="MyApplication" />
    </appSettings>
</configuration>

Example renderer: produces MyApplication is this case.

${appsetting:name=MyKey:default=mydefault}

Example#2 renderer: produces mydefault is this case.

${appsetting:name=MyKey2:default=mydefault}