How to group project results by Taxonomy Terms - orchardcms

Question

I have a ContentType Animal which has a Taxonomy field species.
look at this posthttp://orchardpros.net/tickets/10636 and (http://www.ideliverable.com/blog/ways-to-render-lists-of-things) for a good explanation.
I runed the code,but It have 2 erro.
1.var speciesField = item.Animal.Species;----gave erro: CS1061 ,"Orchard.ContentManagement.ContentItem' does not contain a definition Animal".
2.var items = speciesDictionary[speciesTerm];----gave erro:CS0136 " A local or parameter named 'items' cannot be declared in this scope because that name is used in an enclosing local.
please help!
#using Orchard.ContentManagement
#using Orchard.Taxonomies.Models
#{
var items = ((IEnumerable<ContentItem>)Model.ContentItems);
var speciesDictionary = new Dictionary<TermPart, IList<ContentItem>>();
// Collect categories and their items.
foreach (var item in items) {
var speciesField = item.Animal.Species; // Assumes that the species field is attached to the Animal type's implicit part (Animal).
var speciesTerms = (IEnumerable<TermPart>)speciesField.Terms;
foreach (var speciesTerm in speciesTerms) {
var list = speciesDictionary.ContainsKey(speciesTerm) ? speciesDictionary[speciesTerm] : default(IList<ContentItem>);
if (list == null) {
list = new List<ContentItem>();
speciesDictionary.Add(speciesTerm, list);
}
list.Add(item);
}
}
}
<ul>
#foreach (var speciesTerm in speciesDictionary.Keys) {
var items = speciesDictionary[speciesTerm];
<li>
#speciesTerm.Name
</li>
}
</ul>

Answer 1

Your first error indicates that you are trying to get a property of the ContentItem class which does not exist. This is actually partially correct, because it does exist on the ContentItem, but because you cast it to a ContentItem class, it loses the dynamic properties.
You can fix this by not casting to a ContentItem class, but just to dynamic:
var items = ((IEnumerable<dynamic>)Model.ContentItems);
The second error indicates that you are trying to create a variable while it already exists. This is obvious, because in the top of your .cshtml you already have items defined:
#{
// var items is defined here, you can not redefine it
// as always in C#
var items = ((IEnumerable<ContentItem>)Model.ContentItems);
}
So instead give it a different name in the bottom:
<ul>
#foreach (var speciesTerm in speciesDictionary.Keys) {
// Cannot use 'items' here again
var speciesItems = speciesDictionary[speciesTerm];
<li>
#speciesTerm.Name
</li>
}
</ul>