public static string GetExperssion <T>(this IQueryable <T> items, IList <IFilterDescriptor> filter, FilterCompositionLogicalOperator opr = FilterCompositionLogicalOperator.And)
{
string q = "";
if (filter.Is(typeof(FilterDescriptor)))
{
var list = filter.Cast <FilterDescriptor>();
foreach (var i in list)
{
q += i.Operator.getOerationToString().Replace("y", i.Member).Replace("x", i.Value.ToString()) + " " + (list.Last().Value == i.Value ? " " : " " + opr.ToString() + " ");
}
}
else if (filter.Is(typeof(CompositeFilterDescriptor)))
{
foreach (var i in filter.Cast <IFilterDescriptor>())
{
if (i.GetType() == typeof(CompositeFilterDescriptor))
{
q +=
"(" +
items.GetExperssion(((CompositeFilterDescriptor)i).FilterDescriptors, ((CompositeFilterDescriptor)i).LogicalOperator)
+ " ) " +
(filter.Cast <IFilterDescriptor>().Last() == ((CompositeFilterDescriptor)i) ? " " : " And ");
}
else if (i.GetType() == typeof(FilterDescriptor))
{
q += ((FilterDescriptor)i).Operator.getOerationToString().Replace("y", ((FilterDescriptor)i).Member).Replace("x", ((FilterDescriptor)i).Value.ToString()) + " " + (filter.Cast <IFilterDescriptor>().Last() == ((FilterDescriptor)i) ? " " : " " + opr.ToString() + " ");
}
}
}
return(q);
}
/// <summary>
/// Renders a relationship operator
/// </summary>
/// <param name="builder"></param>
/// <param name="relationship"></param>
protected virtual void RelationshipOperator(StringBuilder builder, FilterCompositionLogicalOperator relationship)
{
builder.AppendFormat(" {0} ", relationship.ToString().ToLower());
}
