Defining the Evaluation Type

Figaro - The XML Database for the .NET Framework

The evaluation type defines how much work Figaro performs as a part of the query, and how much it defers until the results are evaluated. There are two evaluation types:

Evaluation Type	Description
Eager	The query is executed and its resultant values are derived and stored in-memory before the query returns. This is the default.
Lazy	Minimal processing is performed before the query returns, and the remaining processing is deferred until you enumerate over the result set.

You can set the evaluation when creating the QueryContext object, or you can set the property after initialization.

CopyC#

using Figaro.BerkeleyDB.Xml;
namespace Figaro.Documentation.Examples
{
    class SampleSetEvaluationType
    {
        static void Main()
        {
            XmlManager mgr = new XmlManager();
            Container myContainer = mgr.OpenContainer(@"C:\dev\db\exampleData.dbxml");

            //we can set the evaluation type at initialization...
            QueryContext queryContext = mgr.CreateQueryContext(EvaluationType.Eager);
            //...or we can set it at design time.
            queryContext.EvaluationType = EvaluationType.Lazy;
        }
    }
}