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AspNetSession Layout Renderer
ASP.NET Item Variable from Session Dictionary
Platforms Supported: All
${aspnet-session:item=String:objectpath=String:format=String:ValueType=String|Int32}
-
item - Key for lookup in Session-dictionary (Required)
Introduced with NLog.Web v5.1, and replaces the
Variable
-option -
format - Format-specifier for converting the value as string (Optional)
Introduced with NLog.Web v5.0
-
culture - Culture-specifier for converting the value as string (Optional)
Introduced with NLog.Web v5.0
-
objectpath - Property path if the value is an object, also supports nested properties (Optional).
Introduced with NLog.Web v5.2 and replaces
EvaluateAsNestedProperties
-option -
ValueType - Only for ASP.NET Core. Type of the value.
String
(default) orInt32
.Introduced in NLog.Web.AspNetCore 4.9.3. Please note: you won't get an error when retrieving a int (set with
Session.SetInt32(..)
) with valuetypestring
, but an incorrect value. We can't unfortunately recognize the type of the value inside the ASP.NET Core session.
See also Configure session state
Log the username in the session.
In the C# code:
Session["username"] = "JohnDoe";
Config:
<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<targets>
<target name="logfile" xsi:type="File" fileName="file.txt" />
</targets>
<rules>
<logger name="*" minlevel="Info" writeTo="logfile" layout="${aspnet-session:item=username}" />
</rules>
</nlog>
Will print "JohnDoe"
In the C# code:
Session["user"] = new UserInfo { Name= "JohnDoe", Id = 100};
Config:
<?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">
<targets>
<target name="logfile" xsi:type="File" fileName="file.txt" />
</targets>
<rules>
<logger name="*" minlevel="Info" writeTo="logfile" layout="${aspnet-session:item=user:ObjectPath=Name}" />
</rules>
</nlog>
Will print nested property-value "JohnDoe"
- Troubleshooting Guide - See available NLog Targets and Layouts: https://nlog-project.org/config
- Getting started
- How to use structured logging
- Troubleshooting
- FAQ
-
All targets, layouts and layout renderers
Popular: - Using NLog with NLog.config
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