为什么无法从应用程序洞察依赖遥测中获得传出响应？答案

【问题标题】：why cannot get outgoing response from application insights dependency telemetry?为什么无法从应用程序洞察依赖遥测中获得传出响应？
【发布时间】：2022-01-17 13:26:48
【问题描述】：

我使用以下代码从我的 Asp.Net Core 服务中的遥测初始化程序获取传出请求/响应：

    public void Initialize(ITelemetry telemetry)
    {
        if (telemetry is DependencyTelemetry)
        {
            var dependencyTelemetry = telemetry as DependencyTelemetry;

            if (dependencyTelemetry.TryGetOperationDetail("HttpRequest", out var request))
            {
                var httpRequest = request as HttpRequestMessage;
            }

            if (dependencyTelemetry.TryGetOperationDetail("HttpResponse", out var response))
            {
                var httpResponse = response as HttpResponseMessage;
            }
        }
    }

我可以使用上面的代码成功获取请求，但是 TryGetOperationDetail 的响应始终为空。我的代码有什么问题吗？

【问题讨论】：

标签： asp.net-core azure-application-insights

【解决方案1】：

对我来说，这段代码记录了所有发送到依赖项的标头，并且响应已被跟踪。

public void Initialize(ITelemetry telemetry)
    {
        var dependecyTelemetry = telemetry as DependencyTelemetry;
        if (dependecyTelemetry == null) return;

        if (dependecyTelemetry.TryGetOperationDetail("HttpRequest", out object request)
            && request is HttpRequestMessage httpRequest)
        {
            foreach (var item in httpRequest.Headers)
            {
                if (!dependecyTelemetry.Properties.ContainsKey(item.Key))
                    dependecyTelemetry.Properties.Add(item.Key, string.Join(Environment.NewLine, item.Value));
            }
        }
        if (dependecyTelemetry.TryGetOperationDetail("HttpResponse", out object response)
            && response is HttpResponseMessage httpResponse)
        {
            var responseBody = httpResponse.Content.ReadAsStringAsync().GetAwaiter().GetResult();
            if (!string.IsNullOrEmpty(responseBody))
                dependecyTelemetry.Properties.Add("ResponseBody", responseBody);
        }
    }

有关遥测的进一步参考，请参阅site

【讨论】：

您的代码对我有用。谢谢！