Nlog ${callsite-linenumber} 不能在异步方法中正常工作

Question

我正在使用NLog v4.4.12。

我

有一个异步方法，我必须记录包含行号的信息。问题是，如果我在调用异步方法之前记录任何内容，则行木材始终为 0。但是，如果我在调用异步方法后记录任何内容，则行号始终正确打印。还有其他人有这个问题吗？

例：

public class TestController : ApiController {
    private static HttpClient Client = new HttpClient(new HttpClientHandler { Proxy = null, UseProxy = false })
                                                                            { Timeout = TimeSpan.FromSeconds(double.Parse(WebConfigurationManager.AppSettings["httpTimeout"])) };
    private static readonly Logger logger = LogManager.GetCurrentClassLogger();
    public async Task DoSomething(int clientId)
    {
        logger.Info($"Here, line number is always 0");
        try
        {
            var clientBooks = new List<string>();
            Client.DefaultRequestHeaders.Accept.Clear();
            Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            using (var response = await Client.GetAsync(new Uri(WebConfigurationManager.AppSettings["cb"] + "books?clientId=" + clientId)))
            {
                if (response.IsSuccessStatusCode)
                {
                    clientBooks = await response.Content.ReadAsAsync<List<string>>();
                }
                else
                {
                    throw new Exception($"Error getting books");
                }
            }
            logger.Info($"Here, line number always prints correctly");
            // Here I have some other logic ...
        }
        catch (Exception ex)
        {
            logger.Error(ex);
        }
        logger.Info($"Here, line number always prints correctly");
    }
}

我的 NLog 配置：

<nlog autoReload="true" xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <variable name="logDirectory" value="${basedir}/Logs/${shortdate}" />
    <variable name="format" value="${longdate}|${activityid}|${logger}|${callsite-linenumber}|${level:uppercase=true}|${message}" />
    <targets>
      <target name="fileLogErrors" xsi:type="File" fileName="${logDirectory}/errors.txt" layout="${format}" encoding="utf-8" />
      <target name="fileLog" xsi:type="File" fileName="${logDirectory}/all.txt" layout="${format}" encoding="utf-8" />
    </targets>
    <rules>
      <logger name="*" minlevel="Warn" writeTo="fileLogErrors" />
      <logger name="*" minlevel="Info" writeTo="fileLog" />
    </rules>
 </nlog>

Answer 1

NLog 版本 4.5 解决了这个问题： https://github.com/NLog/NLog/issues/2382