Fetching records by date with only day part comparison using nhibernate

Question

I would like to fetch all records from particular day, no matter what time is associated with those records. So far I have method like this:

public IQueryabl         


        

Answer 1

It depends on the LINQ provider. I'm not sure if NHibernate LINQ provider supports the item.SomeDateProperty.Date == x syntax and I'm doubtful it does. But, you can make your own extension method like so:

public static IQueryable FilterByDate(this IQueryable This, Expression> getProperty, DateTime date)
{
  DateTime from = day.Date;
  DateTime to = day.Date.AddDays(1);
  return This.Where(x=> 
    Expression.And(
      Expression.GreaterThan(getProperty, Expression.Variable(from)),
      Expression.LessThan(getProperty, Expression.Variable(to)));

}

This is NOT going to build the way it is now - I was just trying to give you an idea of what to do.

You can then use it like so:

var result = repository.Table.FilterByDate(x=>x.MyDate, new DateTime(2012, 6,6));