Hi Paul,

I foundation the problem.
I have a custom search result item classic which contained a property named Tagscase ejere the indexfield was named tagscase. I know from other indexfield named that the suffix og the indexfield could bedste disregarded, so I removed _sm from the name.
Bur found out agter adding the suffix to the indexfield that IT worked. Like this: tagscase_sm.

Noe IT retuned WhatsApp expected from Contains method in the Enumable property .

Your variables and method naming is too generic for me to understand what it is you’re trying to do.

Im sttrugling with this Contains(ID) of the index array example here

Indexfield queried in Solr:
“tagscase_sm”:[“5a8e142612724fd995bf662dcc06f0c3”,
“fa9fdd2f5d684833ac25c7c9994c4b39”],

SearchResultItem class:

[System.Runtime.Serialization.DataMemberAttribute]
[IndexField(“tagscase”)]
public virtual Enumerable FooCase{ get; set; }

var isFooIncluded = PredicateBuilder.True();

List idsFoo = Somemethod();

foreach (var i in idsFoo)
{
isFooIncluded = isFooIncluded .And(x => x.FooCase.Contains(i));
}

using (var context = ContentSearchManager.GetIndex(“sitecore_web_index”).CreateSearchContext())
{
return context.GetQueryable()
.Where(isFooIncluded )
.ToList();
}

It does not return any items in list even though I know that the search item includes the ids in the array.

I have tried to hardcode the ID inside Contains but it still does not work.
I have tried to change the idsFoo to an array instead idsFoo.ToArray()
Still does not work.

Glad it helped Zach