Exclude list of complex objects from IQueryable by two properties

I have two types:

public class DocumentEntityItem 
{
    public int Id { get; set; }
    public string Type { get; set; }
}

public partial class DocumentEntityToFilesCategory
{
    public int FilesCategoryId { get; set; }
    public int CmsFileId { get; set; }
    public Nullable<int> Sorder { get; set; }
    public string DocumentType { get; set; }

    public virtual FilesCategory FilesCategory { get; set; }
}

And I got the list of DocumentEntityToFilesCategory type. I want to exclude from this list another list of type DocumentEntityItem by two properties - CmsFileId and DocumentType, so I tried to write some code like:

List<string> mainList  = new List<string>()
{
   "1/document",
   "1/link",
   "2/document",
   "3/link"
};
    var documentToCategoryItems= DB.DocumentEntityToFilesCategory.Where(z => z.FilesCategoryId == categoryId);
    List<DocumentEntityItem> documentEntityItems= mainList.Select(z => new DocumentEntityItem
    {
       Id = Int32.Parse(z.Split("/")[0]),
       Type = z.Split("/")[1]
    }).ToList();
    var toDelete = documentToCategoryItems.Where(z => !documentEntityItems.Any(c=>c.Id==z.CmsFileId&&c.Type==z.DocumentType));

But, List.Any() supports only primitive types.