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Error: An expression tree may not contain a dynamic operation

I use Asp.Net 4 and C#, I use EF 4.

I have this query, I receive an error:

 An expression tree may not contain a dynamic operation

dynamic o = e.Item.DataItem;
var imagesContent = context.CmsImagesContents.FirstOrDefault(img => img.ContentId == o.ContentId);

It seems is imposible to Cast a Dynamic Type using a Lamba Expression.

How I can fix the problem, and able to use my object o in my Lamba? Thanks

PS: e.Item.DataItem is of Type CmsContent and o.ContentId is of type Int

Solution

  • Unboxing the object will do the trick:

         int contentId = (int)o.ContentId;
     var image = context.CmsImagesContents.FirstOrDefault(img => img.ContentId == contentId);

    For more info about 'boxing/unboxing' click here