应用程序见解 - 配置堆栈快照

我想在应用程序见解中收集异常堆栈，以便稍后在本地PC上进行调试 .

我有一个.NET 4.7.2框架的ASP.NET MVC 5.2应用程序 .

我将NuGet包Microsoft.ApplicationInsights.SnapshotCollector添加到我的项目中，我的应用洞察键：

<Add Type="Microsoft.ApplicationInsights.SnapshotCollector.SnapshotCollectorTelemetryProcessor, Microsoft.ApplicationInsights.SnapshotCollector">
  <!-- The default is true, but you can disable Snapshot Debugging by setting it to false -->
  <IsEnabled>true</IsEnabled>
  <!-- Snapshot Debugging is usually disabled in developer mode, but you can enable it by setting this to true. -->
  <!-- DeveloperMode is a property on the active TelemetryChannel. -->
  <IsEnabledInDeveloperMode>false</IsEnabledInDeveloperMode>
  <!-- How many times we need to see an exception before we ask for snapshots. -->
  <ThresholdForSnapshotting>1</ThresholdForSnapshotting>
  <!-- The maximum number of snapshots we collect for a single problem. -->
  <MaximumSnapshotsRequired>3</MaximumSnapshotsRequired>
  <!-- The maximum number of problems that we can be tracking at any time. -->
  <MaximumCollectionPlanSize>50</MaximumCollectionPlanSize>
  <!-- How often to reset problem counters. -->
  <ProblemCounterResetInterval>24:00:00</ProblemCounterResetInterval>
  <!-- The maximum number of snapshots allowed per day. -->
  <SnapshotsPerDayLimit>30</SnapshotsPerDayLimit>
  <!--Whether or not to collect snapshot in low IO priority thread.-->
  <SnapshotInLowPriorityThread>true</SnapshotInLowPriorityThread>
</Add>

（我按照文档：https://docs.microsoft.com/en-us/azure/application-insights/app-insights-snapshot-debugger）

我添加了这个控制器方法来测试：

public ActionResult TestCatchException()
    {
        try
        {
            throw new WebException("Test web ex");
        }
        catch(WebException web_ex)
        {
            try
            {
                throw new Exception("Web Catch First Level", web_ex);
            }
            catch(Exception ex)
            {
                var telemetry = new TelemetryClient();
                telemetry.TrackException(ex);
            }
        }

        return RedirectToAction("Error", new { Text = "err" });
    }

然后我在天蓝色的门户网站上看它：

但无法下载异常快照 . 怎么了？