Anonymous Types als Filter

[Thomas Darimont]

Hallo,

hier mal ein Beispiel wie man die neuen Anonymous Types dazu benutzen kann um einen einfachen Filtermechanismus für NHibernate Criteria Queries zu implementieren:

using System;
using System.Collections.Generic;

using Spring.Data.NHibernate.Generic.Support;
using System.Reflection;
using NHibernate;
using NHibernate.Expression;

namespace De.Tutorials.Training
{
    public class Program
    {
        public static void Main(string[] args)
        {

            IGenericDAO genericDao = new GenericHibernateDAO();
            
            //Anonymous type als Filter expression
            IList<TestMock> testMocks = genericDao.FindBy<TestMock>(new { Data = "Test", Value = 24 });
        }
    }

    class TestMock{
        public string Data { get; set; }

        public int Value { get; set; }

        public override string ToString()
        {
            return string.Format("Data: {0} Value: {1}",Data,Value);
        }
    }

    interface IGenericDAO
    {

        /**
         * ...
         */

        IList<TEntity> FindBy<TEntity>(object attributes);


        /**
         * ...
         */
    }

    class GenericHibernateDAO : HibernateDaoSupport,IGenericDAO
    {
        #region IGenericDAO Members

        /**
         * ...
         */

        public IList<TEntity> FindBy<TEntity>(object attributes)
        {
            if (null != attributes)
            {
               return HibernateTemplate.ExecuteFind<TEntity>(delegate(ISession session)
                {
                    ICriteria criteria = session.CreateCriteria(typeof(TEntity));

                    foreach (PropertyInfo property in attributes.GetType().GetProperties())
                    {
                        criteria.Add(Property.ForName(property.Name).Eq(property.GetValue(attributes, new object[0])));
                    }

                    return criteria.List<TEntity>();
                });

              

            }
            return new List<TEntity>();
        }


        /**
         * ...
         */

        #endregion
    }
}

Gruß Tom