private QueryValue GenerateGroupingItem <TKey, TElement>(IGrouping <TKey, TElement> grouping, QueryGroupingType queryGroupingType)
{
var result = queryGroupingType.CreateNewInstance();
var keyValue = this.Convert(grouping.Key, queryGroupingType.Key.PropertyType);
var elementsValue = this.Convert(grouping.Select(g => g), queryGroupingType.Elements.PropertyType);
result.SetValue("Key", keyValue);
result.SetValue("Elements", elementsValue);
return(result);
}
private QueryCollectionValue RewriteGroupingElements(QueryCollectionValue groupings, LinqLambdaExpression elementSelectorLambda)
{
var groupingElementType = (QueryGroupingType)groupings.Type.ElementType;
var rewrittenGroupingType = new QueryGroupingType(groupingElementType.Key.PropertyType, elementSelectorLambda.Body.ExpressionType, groupingElementType.EvaluationStrategy);
var rewrittenGroupings = new List <QueryValue>();
foreach (var grouping in groupings.Elements.Cast <QueryStructuralValue>())
{
QueryCollectionValue elements = grouping.GetCollectionValue("Elements");
var rewrittenElements = elements.Select(e => this.EvaluateLambda <QueryValue>(elementSelectorLambda, e));
var rewrittenGrouping = rewrittenGroupingType.CreateNewInstance();
rewrittenGrouping.SetValue("Key", grouping.GetValue("Key"));
rewrittenGrouping.SetValue("Elements", rewrittenElements);
rewrittenGroupings.Add(rewrittenGrouping);
}
var result = rewrittenGroupingType.CreateCollectionType().CreateCollectionWithValues(rewrittenGroupings);
return(result);
}