public static Expression Compile(
this QueryableSortContext context,
Expression source)
{
if (context.Operations.Count == 0)
{
return(source);
}
var firstOperation = true;
foreach (QueryableSortOperation?operation in context.Operations)
{
if (firstOperation &&
!OrderingMethodFinder.OrderMethodExists(source))
{
source = operation.CompileOrderBy(source);
}
else
{
source = operation.CompileThenBy(source);
}
firstOperation = false;
}
return(source);
}
protected override QueryableSortOperation HandleOperation(
QueryableSortContext context,
QueryableFieldSelector fieldSelector,
ISortField field,
ISortEnumValue?sortEnumValue)
{
return(DescendingSortOperation.From(fieldSelector));
}
public static IQueryable <TSource> Sort <TSource>(
this QueryableSortContext context,
IQueryable <TSource> source)
{
if (context.Operations.Count == 0)
{
return(source);
}
return(source.Provider.CreateQuery <TSource>(context.Compile(source.Expression)));
}
public Func <T[], T[]> Build <T>(IValueNode Sort)
{
var visitorContext = new QueryableSortContext(_inputType, true);
var visitor = new SortVisitor <QueryableSortContext, QueryableSortOperation>();
visitor.Visit(Sort, visitorContext);
Assert.Empty(visitorContext.Errors);
return(elements => visitorContext.Sort(elements.AsQueryable()).ToArray());
}
