Question

这是我的NLog.config文件：

<?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"
          xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd"
          autoReload="true"
          throwExceptions="false"
          internalLogLevel="Off" internalLogFile="c:\temp\nlog-internal.log" >

      <variable name="myvar" value="myvalue"/>

      <targets>

        <target name="database" xsi:type="Database"
                dbUserName="internwebuser"
                dbProvider="System.Data.SqlClient"
                connectionStringName="SECURE"
                connectionString="Data Source=sqlservtest.starledger.com;Initial Catalog=SECURE;User ID=webuser;Password=password"
                commandText="insert into dbo.tracelog (custom_message, excep_message, insertdate) 
                values 
                (@custom_message, @excep_message, @insertdate);" >


          <parameter name="@custom_message"     layout="${exception}" />
          <parameter name="@excep_message"      layout="${exception:tostring}" />
          <parameter name="@insertdate"         layout="${date}" />


        </target>


        <target name="file" xsi:type="File"
                layout="${longdate} ${uppercase:${level}} ${callsite} from Line: ${callsite-linenumber} ${newline} 
    ${exception} ${newline}
    ${exception:tostring} ${newline}"
                fileName="${basedir}/logs/${shortdate}-${level}.log" />


      </targets>  

      <rules>

        <logger name="*" minlevel="Debug" writeTo="file" />
        <logger name="*" minlevel="Debug" writeTo="database" />

      </rules>
    </nlog>

我的控制器看起来像这样：

public class ReportController : Controller
{
    private static Logger logger = LogManager.GetCurrentClassLogger();

    public ActionResult Index()
    {
        try 
        {
            <!-- some statement -->
        }
        catch (Exception e)
        {
            logger.Error(e);
        }
        return View();
   }
}

此代码完美地写入文件但数据库表仍为空。此外，在我的文件中，当我使用StreamWriter创建文件而不是使用NLog时，应用程序同时将2/3种错误写入文件。但是NLog只写了最后一个错误。

例如：

如果是StreamWriter，则错误为：

Exception Name:ExecuteReader requires an open and available Connection. The connection's current state is closed.

Exception Name:Object reference not set to an instance of an object.

但是对于NLog，我只能得到：

Exception Name:Object reference not set to an instance of an object.
and the first one is missed out.

我的StreamWriter方法如下所示：

DateTime today = DateTime.Now;

            string path = Directory.GetCurrentDirectory();

            string fileName = "error-log-" + today.Date.ToString("MM-dd-yyyy") + ".txt";

            var file = Path.Combine(path, fileName);

            StreamWriter log;

            if (!File.Exists(file))
            {
                log = new StreamWriter(file);
            }

            else
            {
                log = File.AppendText(file);
            }

            // Write to the file:

            log.WriteLine("Data Time:" + DateTime.Now);    
            log.WriteLine("Exception Name:" + sExceptionName);    
            log.WriteLine("Event Name:" + sEventName);    
            log.WriteLine("Error Line No.:" + nErrorLineNo);    

            // Close the stream:

            log.Close();

我将该方法传递给控制器的catch部分。

我的主要问题是写入数据库表，虽然我也非常感谢使用Nlog编写所有错误的帮助，而不仅仅是最后一个。

Answer 1

我遇到了同样的问题。为了找到确切的问题，我在 nlog 标签中添加了 <nlog internalLogFile="c:\DemoLogs\nlog-internal.txt" and internalLogLevel="Error">。这会将确切的proplem写入日志文件

就我而言，Could not load file or assembly 'System.Data.SqlClient 在我安装该 nuget 包时得到解决。

Answer 2

请启用internal logging以获取更多信息

NLog正在写入文件而不是数据库表

2 个答案: