How to add multiple And and Or in where clause using Ideablade Predicate Description

Question

How can we add multiple Or and And Operations in where clause in Predicate Description of ideablade. ex.

 List < PredicateDescription > pdList = new List< PredicateDescription >();

 Dictionary< int, List< PredicateDescription>> pdDateList = new Dictionary< int,  List< PredicateDescription>>();

 var pds = pdList.ToArray();

 if (((pds.Length > 0) || (pdDateList.Count > 0)))
 {

     CompositePredicateDescription predicate = null;
     if (pds.Length > 0)
     {
                predicate = PredicateBuilder.And(pds);
     }                    
     List<PredicateDescription> AndList = null;                    
     CompositePredicateDescription compositePredicateDescription = null;
     for (int i = 0; i < pdDateList.Count; i++)
     {  
           List<PredicateDescription> pdlist1 =  pdDateList[i];
           AndList = new List<PredicateDescription>();
           foreach (PredicateDescription pdesc in pdlist1) 
           {
                  AndList.Add(pdesc);
           }
           if (AndList.Count > 0) 
           {   
                 if (predicate != null)
                 {
                        if (AndList.Count == 2)
                        {
                            predicate.Or(AndList[0].And(AndList[1]));
                        }
                        else if (AndList.Count == 1)
                        {
                            predicate.Or(AndList[0]);
                        }
                 }
           }
     }
}

if (predicate == null)

{

 predicate = compositePredicateDescription;

}

                var filterQuery = query.Where(predicate);                    
                data = Globals.sLDManager.ExecuteQuery(filterQuery);

As Above I have tried to adding Or operator in CompositePredicateDescription, but it is not working

I want to run following query -

Select * from Tabel1 where t.field1=1 and t.field2=1 and t.field3=1 Or ( t.field4=1 and t.field5=1) Or (t.field6=1 and t.field7=1)

How can I run above query using ideablade.

Answer 1

You should be able to use CompositePredicateDescription in this situation without problems. How is it not working?

Here's an example:

  PredicateDescription p1 = PredicateBuilder.Make(typeof(Product), "UnitPrice", FilterOperator.IsGreaterThanOrEqualTo, 24);
  PredicateDescription p2 = PredicateBuilder.Make(typeof(Product), "Discontinued", FilterOperator.IsEqualTo, true);

  CompositePredicateDescription p3 = p1.And(p2);

  PredicateDescription p4 = PredicateBuilder.Make(typeof(Product), "UnitsInStock", FilterOperator.IsGreaterThanOrEqualTo, 1);
  PredicateDescription p5 = PredicateBuilder.Make(typeof(Product), "UnitsOnOrder", FilterOperator.IsGreaterThanOrEqualTo, 1);

  CompositePredicateDescription p6 = p1.And(p2);

  CompositePredicateDescription p7 = p3.Or(p6);

  var query = mgr.Products.Where(p7);

The code above will generate the WHERE statement below (from SQL Profiler) which has the same pattern as the WHERE statement in your query:

WHERE (([Extent1].[UnitPrice] >= cast(24 as decimal(18))) AND (1 = [Extent1].[Discontinued])) OR (([Extent1].[UnitPrice] >= cast(24 as decimal(18))) AND (1 = [Extent1].[Discontinued]))

If you haven't done so already, you might want to take a look at the DevForce Resource Center article on dynamic WHERE clauses.