How to Generate a Comprehensive Date Range Array for Multi-Series Graphing?

Generate an array or list of dates between two dates

Issue: When generating a multi-series chart using date as the X-axis, you may run into issues if not all series have data in the same date range. This difference can skew the chart and make it difficult to gain accurate insights.

Solution: To solve this problem, you can create an array or list containing all dates within a specified date range. You can use the following two methods:

LINQ:

<code class="language-csharp">Enumerable.Range(0, 1 + end.Subtract(start).Days)
          .Select(offset => start.AddDays(offset))
          .ToArray();</code>

For loop:

<code class="language-csharp">var dates = new List<DateTime>();

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

Fill missing values ​​with default values:

Once you have a list of dates, you can handle missing data points by filling them with default values. You can achieve this by enumerating all dates in the full date range and selecting a value from the series if present, otherwise selecting a default value. For example:

<code class="language-csharp">var paddedSeries = fullDates.ToDictionary(date => date, date => timeSeries.ContainsKey(date) ? timeSeries[date] : defaultValue);</code>

By using the above techniques, you can create a comprehensive list of dates for your chart and ensure that the data points in all series are properly aligned even though some series may be missing data.

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