How to Generate a Complete Date List for Graphing Data with Varying Ranges?

Generate a list of dates with different data ranges for the chart

When plotting a chart of multiple series on the date axis, it is often encountered that different series have different data ranges within the specified date range. This difference can skew the chart.

To solve this problem, we can generate a complete list of dates based on the overall date range and fill the data accordingly, filling missing values ​​with zeros. Here are two ways to do this:

1. Use LINQ:

var dates = Enumerable.Range(0, 1 + end.Subtract(start).Days)
          .Select(offset => start.AddDays(offset))
          .ToArray();

2. Use For loop:

var dates = new List<DateTime>();

for (var dt = start; dt <= end; dt = dt.AddDays(1))
{
    dates.Add(dt);
}

To fill in missing values, you can enumerate all dates in the full range and, if present, retrieve the value for each date from the sequence; otherwise, use the default value. For example:

var paddedSeries = fullDates.ToDictionary(date => date, date => timeSeries.ContainsKey(date) 
                                               ? timeSeries[date] : defaultValue);

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