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Update Poll Live Sample Code in C# #62

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Merged
salman-mclarenapplied merged 1 commit into from
Jul 28, 2026
Merged

Update Poll Live Sample Code in C# #62

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31 changes: 23 additions & 8 deletions snippets/csharp/live-data/poll-live-samples.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -50,15 +50,33 @@
}
}

var sessionSummary = sessionManager.FindSummaryBy(sessionKey, connectionString);

var pollCount = 0;

// --- Load the session with server listener so we can pick up live data ---
using var clientSession = sessionManager.Load(sessionSummary.Key, sessionSummary.GetConnectionString());
var session = clientSession.Session;

using var pda = session.CreateParameterDataAccess(paramId);
var lastEndTime = long.MinValue;
while (!cts.Token.IsCancellationRequested)
{
// --- Reload session each cycle to pick up newly flushed data ---
using var clientSession = sessionManager.Load(sessionKey, connectionString);
var session = clientSession.Session;
try { await Task.Delay(2000, cts.Token); }
catch (OperationCanceledException) { break; }

// --- Check if the end time is updated. ---
var endTime = session.EndTime;
if (lastEndTime >= endTime)
{
// --- End time has not been changed. No new data. ---
Console.WriteLine($" Poll {++pollCount}: no data yet");
continue;
}

using var pda = session.CreateParameterDataAccess(paramId);
pda.GoTo(long.MaxValue);
// --- End time has changed. Update lastEndTime and fetch the latest samples. ---
lastEndTime = endTime;
pda.GoTo(lastEndTime);
var samples = pda.GetNextSamples(5, StepDirection.Reverse);

if (samples.SampleCount > 0)
Expand All @@ -71,9 +89,6 @@
{
Console.WriteLine($" Poll {++pollCount}: no data yet");
}

try { await Task.Delay(2000, cts.Token); }
catch (OperationCanceledException) { break; }
}

Console.WriteLine($"\nPolling complete — {pollCount} polls.");
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