ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Data Namespace / TableStatisticsDescription Class / OrderBy Property
Example Version

OrderBy Property
Gets or sets a list of SortDescriptions to be used to sort the TableStatisticsResults that are returned.
Syntax
Exceptions
ExceptionDescription
The SortDescription input at a specific index in the OrderBy list is null.
Remarks
If the underlying data store does not support SQL (e.g., shapefiles), OrderBy will have no effect on the outcome of the computation.
Example
Calculating Statistics on a Table
// Calculate the Sum and Average of the Population_1990 and Population_2000 fields, grouped and ordered by Region
public void CalculateStatistics(FeatureClass countryFeatureClass)
{
    using (FeatureClassDefinition featureClassDefinition = countryFeatureClass.GetDefinition())
    {
        // Get fields
        Field regionField = featureClassDefinition.GetFields()
          .First(x => x.Name.Equals("Region"));
        Field pop1990Field = featureClassDefinition.GetFields()
          .First(x => x.Name.Equals("Population_1990"));
        Field pop2000Field = featureClassDefinition.GetFields()
          .First(x => x.Name.Equals("Population_2000"));

        // Create StatisticsDescriptions
        StatisticsDescription pop1990StatisticsDescription = new StatisticsDescription(pop1990Field,
                  new List<StatisticsFunction>() { StatisticsFunction.Sum,
                                            StatisticsFunction.Average });

        StatisticsDescription pop2000StatisticsDescription = new StatisticsDescription(pop2000Field,
                  new List<StatisticsFunction>() { StatisticsFunction.Sum,
                                            StatisticsFunction.Average });

        // Create TableStatisticsDescription
        TableStatisticsDescription tableStatisticsDescription = new TableStatisticsDescription(new List<StatisticsDescription>() {
              pop1990StatisticsDescription, pop2000StatisticsDescription });
        tableStatisticsDescription.GroupBy = new List<Field>() { regionField };
        tableStatisticsDescription.OrderBy = new List<SortDescription>() { new SortDescription(regionField) };

        // Calculate Statistics
        IReadOnlyList<TableStatisticsResult> tableStatisticsResults = countryFeatureClass.CalculateStatistics(tableStatisticsDescription);

        foreach (TableStatisticsResult tableStatisticsResult in tableStatisticsResults)
        {
            // Get the Region name
            // If multiple fields had been passed into TableStatisticsDescription.GroupBy, there would be multiple values in TableStatisticsResult.GroupBy
            string regionName = tableStatisticsResult.GroupBy.First().Value.ToString();

            // Get the statistics results for the Population_1990 field
            StatisticsResult pop1990Statistics = tableStatisticsResult.StatisticsResults[0];
            double population1990Sum = pop1990Statistics.Sum;
            double population1990Average = pop1990Statistics.Average;

            // Get the statistics results for the Population_2000 field
            StatisticsResult pop2000Statistics = tableStatisticsResult.StatisticsResults[1];
            double population2000Sum = pop2000Statistics.Sum;
            double population2000Average = pop2000Statistics.Average;

            // Do something with the results here...
        }
    }
}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also