How to pass anonymous property via lambda to a generic function?

Question

I want to pass anonymous property using lambda to a generic function and access it there.
And how Do I access the property inside.

using (CommentsRepository commentsRepository = new CommentsRepository())
{
   var comments = commentsRepository.GetAllComments();

   Foo<Comment>(comments, 0,com=>com.ID); //Comment is an  EF entity
}

public static void Foo<TObject>(IEnumerable<TObject> list, int iCurID, <Func<TObject, TProperty> property) where TObject : class
{       
   foreach (var cat in list.Where(/*How to access the property*/==iCurID)
   {
          int x = cat.property;
   }
 }

Jon Skeet · Accepted Answer · 2011-04-02 11:50:29Z

3

You just call the delegate:

public static void Foo<TObject>
    (IEnumerable<TObject> list, 
     int iCurID,
     Func<TObject, int> propertySelector) where TObject : class
{       
   foreach (var cat in list.Where(x => propertySelector(x) == iCurID))
   {

   }
}

Note that I had to change the type of the delegate to Func<TObject, int> as otherwise you couldn't compare it with iCurID.

edited Apr 2, 2011 at 11:50

answered Apr 2, 2011 at 11:30

Jon Skeet

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6 Comments

urker Over a year ago

what is propertySelector? you mean property(x)?

Jon Skeet Over a year ago

@urker: Sorry, I meant to change the name of the parameter - personally I'd also change "iCurID" which is reasonably meaningless too.

Jon Skeet Over a year ago

@urker: It's not clear what you mean by "how do I access the property inside". What are you trying to do? Inside where?

urker Over a year ago

@Jon Skeet, inside loop! get the property value: int x = cat.property;

Jon Skeet Over a year ago

@urker: You already know the value of the property - iCurID - otherwise it wouldn't have passed the Where clause to start with.

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