public ref class PollingCounter : System::Diagnostics::Tracing::DiagnosticCounter[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public class PollingCounter : System.Diagnostics.Tracing.DiagnosticCounterpublic class PollingCounter : System.Diagnostics.Tracing.DiagnosticCounter[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type PollingCounter = class
inherit DiagnosticCountertype PollingCounter = class
inherit DiagnosticCounterPublic Class PollingCounter
Inherits DiagnosticCounterPollingCounter is a variant of EventCounter that uses a callback method to poll for values rather than requiring the writer to explicitly call EventCounter.WriteMetric each time a value is tracked, metricProvider is a callback method that polls for values. The PollingCounter instance polls and reports a value retrieved by calling metricProvider exactly once per the interval requested by the listener.
A PollingCounter lives as long as the EventSource that it is attached to unless it is explicitly disposed.
PollingCounter differs from EventCounter in that it takes a callback function to collect metrics on its own rather than requiring the user to call WriteMetric every time.
For an example that uses PollingCounter inside the runtime for runtime performance counters, see the CoreCLR source for RuntimeEventSource on GitHub.
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