// Execute a statistical query using the parameters defined by the user and display the results
private async void OnExecuteStatisticsQueryClicked(object sender, EventArgs e)
{
// Verify that there is at least one statistic definition
if (!_statDefinitions.Any())
{
await((Page)Parent).DisplayAlert("Please define at least one statistic for the query.", "Statistical Query", "OK");
return;
}
// Create the statistics query parameters, pass in the list of statistic definitions
StatisticsQueryParameters statQueryParams = new StatisticsQueryParameters(_statDefinitions);
// Specify the group fields (if any)
foreach (string groupField in _groupByFields)
{
statQueryParams.GroupByFieldNames.Add(groupField);
}
// Specify the fields to order by (if any)
foreach (OrderFieldOption orderBy in _orderByFields)
{
statQueryParams.OrderByFields.Add(orderBy.OrderInfo);
}
// Execute the statistical query with these parameters and await the results
StatisticsQueryResult statQueryResult = await _usStatesTable.QueryStatisticsAsync(statQueryParams);
// Get results formatted as a lookup (list of group names and their associated dictionary of results)
ILookup <string, IReadOnlyDictionary <string, object> > resultsLookup = statQueryResult.ToLookup(result => string.Join(", ", result.Group.Values), result => result.Statistics);
// Loop through the formatted results and build a list of classes to display as grouped results in the list view
ObservableCollection <ResultGroup> resultsGroupCollection = new ObservableCollection <ResultGroup>();
foreach (IGrouping <string, IReadOnlyDictionary <string, object> > group in resultsLookup)
{
// Create a new group
ResultGroup resultGroup = new ResultGroup()
{
GroupName = group.Key
};
// Loop through all the results for this group and add them to the collection
foreach (IReadOnlyDictionary <string, object> resultSet in group)
{
foreach (KeyValuePair <string, object> result in resultSet)
{
resultGroup.Add(new StatisticResult {
FieldName = result.Key, StatValue = result.Value
});
}
}
// Add the group of results to the collection
resultsGroupCollection.Add(resultGroup);
}
// Apply the results to the list view data source and show the results grid
StatResultsList.ItemsSource = resultsGroupCollection;
ResultsGrid.IsVisible = true;
}
// Execute a statistical query using the parameters defined by the user and display the results
private async void OnExecuteStatisticsQueryClicked(object sender, RoutedEventArgs e)
{
// Verify that there is at least one statistic definition
if (_statDefinitions.Count == 0)
{
MessageBox.Show("Please define at least one statistic for the query.", "Statistical Query");
return;
}
// Create the statistics query parameters, pass in the list of statistic definitions
StatisticsQueryParameters statQueryParams = new StatisticsQueryParameters(_statDefinitions);
// Specify the group fields (if any)
foreach (string groupField in _groupByFields)
{
statQueryParams.GroupByFieldNames.Add(groupField);
}
// Specify the fields to order by (if any)
foreach (OrderBy orderBy in _orderByFields)
{
statQueryParams.OrderByFields.Add(orderBy);
}
// Ignore counties with missing data
statQueryParams.WhereClause = "\"State\" IS NOT NULL";
try
{
// Execute the statistical query with these parameters and await the results
StatisticsQueryResult statQueryResult = await _usStatesTable.QueryStatisticsAsync(statQueryParams);
// Format the output, and display results in the tree view
ILookup <string, IReadOnlyDictionary <string, object> > groupedResults = statQueryResult.ToLookup(r => string.Join(", ", r.Group.Values), r => r.Statistics);
ResultsTreeView.ItemsSource = groupedResults;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Invalid statistics definitions");
}
}
