public string GetFilterText(Expression expression)
{
ProjectionExpression projection = this.Translate(expression);
if (projection == null || projection.Searcher == null)
{
return(null);
}
return(LdapFilterFormatter.Format(projection.Searcher.Filter));
}
private DirectorySearcher CreateSearcher(DirectorySearcherExpression node)
{
if (node == null)
{
return(null);
}
DirectoryEntry searchRoot = node.SearchRoot;
string filter = LdapFilterFormatter.Format(node.Filter);
if (string.IsNullOrEmpty(filter))
{
filter = null;
}
string[] propertiesToLoad = node.AttributesToLoad.Select(a => a.Name).ToArray();
SearchScope scope = node.Scope;
SortOption sort = CreateSortOption(node.Sort);
int? sizeLimit = null;
if (node.Take != null)
{
var take = node.Take as ConstantExpression;
if (take == null)
{
throw new NotSupportedException("Cannot have a take value of anything other than a constant.");
}
sizeLimit = (int)take.Value;
// Have to add on the skip size, so we don't get too few results.
var skip = node.Skip as ConstantExpression;
if (skip != null)
{
sizeLimit += (int)skip.Value;
}
}
var searcher = new DirectorySearcher(searchRoot, filter, propertiesToLoad, scope);
if (sort != null)
{
searcher.Sort = sort;
}
if (sizeLimit.HasValue)
{
searcher.SizeLimit = sizeLimit.Value;
}
return(searcher);
}
