C# 注入azure函数中的自定义类记录器不会写入控制台

我有Azure功能V2（IotHub触发器）。如果我在主触发器函数中使用ILogger，则log.Debug（）输出完美：

[FunctionName("MainFunc")]
public async Task Run([IoTHubTrigger("messages/events", Connection = "IotHubCompatibleEndpointConnectionString", ConsumerGroup = "iothub_trigger_sqldb_cg")]
    EventData eventData,
    ILogger log)
{

    log.LogDebug("it outputs!"); // works perfectly

我想做的是将logger注入到我的自定义服务中：

public class Startup : IWebJobsStartup
{
    public void Configure(IWebJobsBuilder builder)
    {
        builder.Services.AddScoped<ITelemetryProcessor, TelemetryProcessor>();
        builder.Services.AddScoped<INotificationSender, NotificationSender>();
        builder.Services.AddLogging();
    }
}

公共类启动：IWebJobsStartup
{
公共void配置（IWebJobsBuilder生成器）
{
builder.Services.addScope（）；
builder.Services.addScope（）；
builder.Services.AddLogging（）；
}
}

在服务构造函数中，我尝试用两种方式将日志写入输出控制台

public TelemetryProcessor(INotificationSender notificationSender, ILogger<ITelemetryProcessor> log, ILoggerFactory loggerFactory)
{
    _notificationSender = notificationSender;
    _log = loggerFactory.CreateLogger("common");
    _log.LogDebug("write something"); // doesn't output
    log.LogDebug("write something v2"); // doesn't output as well
 ....
}

公共遥测处理器（INotificationSender notificationSender、ILogger日志、ILogger工厂日志）
{
_notificationSender=notificationSender；
_log=loggerFactory.CreateLogger（“公共”）；
_log.LogDebug（“写东西”）；//不输出
LogDebug（“write something v2”）；//也不输出
....
}

应在host.json中设置日志记录 添加日志段后，注入的日志（两者）开始工作

例如：

{
  "version": "2.0",
  "logging": {
    "fileLoggingMode": "debugOnly",
    "logLevel": {
      // For all functions
      "Function": "Trace",
      // Default settings, e.g. for host
      "default": "Trace"
    }
  }
}

---

有关配置的更多信息，请参见

您是否指定了

[assembly:WebJobsStartup（typeof（Startup））]

属性

下面是一个完整的工作示例

    private IServiceCollection ConfigureServices(IServiceCollection services)
    {
        services
            .AddLogging(loggingBuilder =>
                loggingBuilder.AddSerilog(
                    new LoggerConfiguration()
                        .WriteTo.DatadogLogs(
                            apiKey: "REPLACE - DataDog API Key",
                            host: Environment.MachineName,
                            source: "REPLACE - Log-Source",
                            service: GetServiceName(),
                            configuration: new DatadogConfiguration(),
                            logLevel: LogEventLevel.Infomation
                        )
                        .CreateLogger())
            );

        return services;
    }