public override object Execute(ParameterList parameters, FunctionContextContainer context)
{
SitemapScope SitemapScope;
Expression filter;
if (parameters.TryGetParameter <SitemapScope>("SitemapScope", out SitemapScope) == false)
{
SitemapScope = SitemapScope.Current;
}
switch (SitemapScope)
{
case SitemapScope.Current:
Guid currentPageId = PageRenderer.CurrentPageId;
filter = Expression.Equal(_foreignKeyPropertyExpression, Expression.Constant(currentPageId));
break;
case SitemapScope.All:
filter = Expression.Constant(true);
break;
default:
Guid pageId = PageRenderer.CurrentPageId;
IEnumerable <Guid> pageIds = new FilterWrapper(
pageId,
SitemapScope, TableVersion.Get(typeof(IPageStructure)),
PageStructureInfo.GetAssociatedPageIds(pageId, SitemapScope));
Expression <Func <Guid, bool> > containsExpression = f => pageIds.Contains(f);
filter = Expression.Invoke(containsExpression, _foreignKeyPropertyExpression);
break;
}
return(Expression.Lambda <Func <T, bool> >(filter, new ParameterExpression[] { _parameterExpression }));
}
