private static Expression ConcatenateAndOrExpressions(
IEnumerable <Filter> filters,
ParameterExpression itemParameter,
Type filterableClassType)
{
Expression where = null;
MemberExpression property;
Expression filterExpression;
if (filters != null)
{
foreach (var filter in filters)
{
property = RecursivelyPropertyInfoGetter.CreatePropertyExpression(itemParameter, filter.PropertyName);
filter.Value = ValueParser.ParseValueToPropertyType(property, filter.Value);
filterExpression = CompareExpressionByOperator(
filter.Operator,
property,
Expression.Constant(filter.Value));
if (filter.OrFilters != null && filter.OrFilters.Count > 0)
{
Expression filtersExpressions = ConcatenateAndOrExpressions(filter.OrFilters, itemParameter, filterableClassType);
if (filtersExpressions != null)
{
filterExpression = Expression.OrElse(filterExpression, filtersExpressions);
}
}
if (where != null)
{
where = Expression.AndAlso(where, filterExpression);
}
else
{
where = filterExpression;
}
}
}
return(where);
}