NLOG：创建同一类的多个实例，将日志写入同一文件

Question

我试图适应NLOG，发现很难为同一类的多个实例设置日志文件。每个类都在不同的线程上创建。请在下面的示例代码中找到：

    {
        ILogger mLogger;
        public string Name { get; set; }
        public string SecondName { get; set; }
        private string mFilePath = @"C:\Logs\";
        public test(string name, string secondname)
        {
            var target = new FileTarget(name) { FileName = mFilePath + name + ".txt" };
            var config = new LoggingConfiguration();
            config.AddRule(LogLevel.Info, LogLevel.Info, target);
            LogManager.Configuration = config;
            mLogger = LogManager.GetLogger(name);
            LogManager.ReconfigExistingLoggers();
            mLogger.Info("Hi from :" + name);
        }
    }
    static void Main(string[] args)
        {
            new Thread(new ThreadStart(() => { new test("Stuart", "Broad"); })).Start();
            new Thread(new ThreadStart(() =>
            {
                new test("John", "Smith");
            })).Start();
            new Thread(new ThreadStart(() =>
            {
                new test("Virat", "Kohli");
            })).Start();
            new Thread(new ThreadStart(() =>
            {
                new test("Christiano", "Ronaldo");
            })).Start();

            new Thread(new ThreadStart(() =>
                {
                    new test("Pat", "cummins");
                })).Start();
            Console.Read();
        }

输出为：2020-03-03 11：36：56.9404 | INFO |克里斯蒂亚诺| Hi from：克里斯蒂亚诺2020-03-03 11：36：56.9404 | INFO | Stuart | Hi来自：Stuart2020-03-03 11：36：56.9404 | INFO | John | Hi来自：John2020-03-03 11：36：56.9404 | INFO | Virat |您好：Virat2020-03-03 11：36：56.9404 | INFO |帕特|嗨：:帕特

仅来自一个文件Christiano.txt

有人可以帮我配置这个吗？

谢谢。

Answer 1

LogManager.Configuration是静态变量。分配时，会影响其他所有人。

而是为每个线程提供唯一的Logger。同一个FileTarget可以处理多个Logger。

{
    ILogger mLogger;
    public string Name { get; set; }
    public string SecondName { get; set; }
    public test(string name, string secondname)
    {
        mLogger = LogManager.GetLogger(name);
        mLogger.Info("Hi from :" + name);
    }
}
static void Main(string[] args)
    {
        string mFilePath = @"C:\Logs\";
        var target = new FileTarget(name) { FileName = Path.Combine(mFilePath, "${logger}.txt") };
        var config = new LoggingConfiguration();
        config.AddRule(LogLevel.Info, LogLevel.Info, target);
        LogManager.Configuration = config;

        new Thread(new ThreadStart(() => { new test("Stuart", "Broad"); })).Start();
        new Thread(new ThreadStart(() =>
        {
            new test("John", "Smith");
        })).Start();
        new Thread(new ThreadStart(() =>
        {
            new test("Virat", "Kohli");
        })).Start();
        new Thread(new ThreadStart(() =>
        {
            new test("Christiano", "Ronaldo");
        })).Start();

        new Thread(new ThreadStart(() =>
            {
                new test("Pat", "cummins");
            })).Start();
        Console.Read();
    }

或者，您可以选择assign names to the threads，并使用NLog ${threadname}代替FileName-Layout中的${logger}。

还有另一种选择是使用NLog MappedDiagnosticsLogicalContext.SetScoped("TestName", name)创建范围，并在FileName-Layout中使用${mdlc:TestName}。这还将使您可以将初始上下文传递给异步任务。