Web API + Azure App Insights 将数据从 ActionFilter 传递到 ITelemetryProcessor

Question

我想自定义我的 Application Insights 日志记录行为。所以我想在我的 ActionFilter 中设置某种标志，然后在 ITelemetryProcessor 中读取该标志。

public class MyCustomFilterAttribute: ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext filterContext)
    {
        //perform some logic and set the flag here
    }
}

然后

public class TelemetryFilter : ITelemetryProcessor
{
    public void Process(ITelemetry item)
    {
        var request = item as RequestTelemetry;
        //read the flag here and terminate processing
    }
}

这可能吗？这两种类型之间是否共享某种 TempData ？我想避免像设置临时标题等那样的黑客行为。提前致谢。

Answer 1

我不确定这是否有用。但我希望会。

使用Activity.Current

    public void Initialize(ITelemetry telemetry)
    {
        Activity current = Activity.Current;

        if (current == null)
        {
            current = (Activity)HttpContext.Current?.Items["__AspnetActivity__"];
//put your code here
        }
}

参考这个SO

Answer 2

编写一个 TelemetryInitializer，您可以在其中访问 HttpContext。

//遥测初始化器

public void Initialize(ITelemetry telemetry)
    {
     var ctx = HttpContext.Current; // Telemetry Initialzer runs in same thread as the request.
     var request = item as RequestTelemetry;
     req.Properties.Add("MyActionFilter", "MyActionFilterValue")
     ...
    }

//遥测处理器

public void Process(ITelemetry item)
    {
        var request = item as RequestTelemetry;
        //read the flag here and terminate processing
        if(req.Properties["MyActionFilter"] == "somthing")
        {
        ...
        }
    }

https://docs.microsoft.com/en-us/azure/application-insights/app-insights-api-filtering-sampling#itelemetryprocessor-and-itelemetryinitializer

对于 Asp.Net Core，将 IHttpContextAccessor 注入 TelemetryInitializer 构造函数可以获得上下文，如下所示： https://github.com/Microsoft/ApplicationInsights-aspnetcore/blob/develop/src/Microsoft.ApplicationInsights.AspNetCore/TelemetryInitializers/TelemetryInitializerBase.cs