如何使用MVC中的Nlog将消息记录到txt文件？

Question

I am using Nlog in my MVC project

What I want to achieve is to log a message when a action method is executed in my controller. and the log message should appear on a txt file. But I cant seem to get it to work

I have installed Nlog to my references.

I've got Nlog.Config with following configuration:

<?xml version="1.0" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <targets>
        <target name="file"
                xsi:type="File"
                layout="${longdate} ${logger} ${message}"
                fileName="${basedir}/logs/logfile.txt"
                keepFileOpen="false"
                encoding="iso-8859-2" />
    </targets>
    <rules>
        <logger name="*"
                minlevel="Debug"
                writeTo="file" />
    </rules>
</nlog>

and then inside my POST action method in my controller I have following code:

[HttpPost]
public ActionResult Edit(int id, CreateNKIphase1ViewModel model)
{
    Logger logger = LogManager.GetCurrentClassLogger();
    logger.Info("Test message");

     //code....
}

Where can I find the txt file?

Why is this not working :S

Answer 1

If your application is running in IIS using an application pool identity, you will need to grant folder permissions to that identity.

• Create the 'logs' folder.
• In IIS Manager, find the app pool identity that your application is using.
• In the 'logs' folder property dialog, grant write permission to the app pool identity.

When you enter the name for the app pool identity, you will need to include IIS APPPOOL . For example, if the app pool identity is ASP.NET v4.0 , enter the name as IIS APPPOOL\\ASP.NET v4.0 . Also, make sure the location is the local machine, not a network domain.

Answer 2

Why not set the fileName attribute to a known path and name, rather than using the ${basedir} format?

fileName="C:\Temp\logfile.txt"

That way you will know where the file is supposed to be. Once you have that part of the logging down, you can start adding in the more advanced techniques.

Answer 3

It's perfectly working, but ${basedir} for asp.net application isn't same as for typical desktop application. I believe this file is available from temporary folders, not far from your application assemblies.

You either can define your own variable or define a direct access to the 'logs' folder. Make sure that application can write logs into this folder. Use this answer, it's perfectly describe what you should do

Answer 4

如果在调试模式下运行应用程序，可以通过以下路径找到它：

"%PARTITION%:\\...PATH TO YOUR APP...\bin\Debug\\...