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
    }
}

接着

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

那可能吗 ？ 这两种类型之间是否共享某种TempData？ 我想避免诸如设置临时标头之类的黑客行为。 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
        }
}

请参阅本SO

Answer 2

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

// TelemetryInitializer

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")
     ...
    }

// TelemetryProcessor

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构造函数可以为您提供上下文，如下所示： https : //github.com/Microsoft/ApplicationInsights-aspnetcore/blob/develop/src/Microsoft.ApplicationInsights.AspNetCore/TelemetryInitializers/TelemetryInitializerBase的.cs