Conditional Lambda

Question

I want to apply a condition, after I passed another condition like this:

List<Entity> GetByCondition()
{
  If(dateConditionEnabled)
    {
      Repository.Get(i=>i.start<=datetime.Now && i.EndDate<=DateTime.Now);
    }
  else
    {
        Repository.Get();
    }
}

I want to apply "If" condition, in the lambda I used in Get method.

Any idea?

-Regards

Henrik · Accepted Answer · 2012-06-14 06:58:41Z

3

Is Get() equivalent to Get( i => true)? In this case you can use:

List<Entity> GetByCondition()
{
      return Repository.Get(!dateConditionEnabled || i=>i.start<=datetime.Now && i.EndDate<=DateTime.Now);
}

answered Jun 14, 2012 at 6:58

Henrik

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Comments

Hamlet Hakobyan · Accepted Answer · 2012-06-14 07:10:47Z

2

Why not

List<Entity> GetByCondition()
{
      return Repository.Get(i=>!i.dateConditionEnabled || i.start<=datetime.Now && i.EndDate<=DateTime.Now);
}

?

answered Jun 14, 2012 at 7:10

Hamlet Hakobyan

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3 Comments

PickleRick Over a year ago

Thank you Hamlet, Henrik answered first. but the first part, !i.dateConditionEnabled of your post is correct.

AlanT Over a year ago

Is 'dateConditionEnabled' a member of the repository entry or is it a part of the class which contains GetByCondition()? If a part of the class then i => !i.dateConditionEnabled will give an error.

PickleRick Over a year ago

dateConditionEnabled is a property of my entity, but no, there is no error here :)

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