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TimeSpan and GameTime

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I'm trying to have something happen every Xms in game time. To do this I created a TimeSpan (ts) object initialized to 0. In my update method, I add gameTime.ElapsedGameTime onto ts. Then I compare against ts.Milliseconds.

When I pass the desired amount on ms, I need to reset ts to 0. But Milliseconds is read only. I don't see a way of zeroing out a TimeSpan object without creating a new one.

Is there a different object I should be using to track passed time?

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In the simplest case, you could use a float or double to just track elapsed milliseconds. When your Update function is called, add ElapsedGameTime.TotalMilliseconds to your float/double variable.

In a more complex case, you could keep using the TimeSpan for clarity and do something like this:

// Declaration (class member variable)
TimeSpan nextEventTime; // measured in TotalGameTime.

// Reset the event (wherever you want to reset it)
nextEventTime = gameTime.TotalGameTime + new TimeSpan(0,0,0,0, milliseconds);

// Test the event (in Update method)
if (gameTime.TotalGameTime >= nextEventTime)
// do whatever.

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