对带有别名的LINQ查询使用自动完成功能

Question

I'm using autocomplete with a LINQ query. The code works when I don't use an alias for the column but gets an error when I use an alias. Here is the code that works:

var suggestions = from v in db.ValueDocument
                          select v.HeaderTitle;

var namelist = suggestions.Where(n => n.ToLower().StartsWith(term.ToLower()));

return this.Json(namelist, JsonRequestBehavior.AllowGet);

If I change the query to below it gets an error.

var suggestions = from v in db.ValueDocument
                           select new { Header = v.HeaderTitle };

The error I'm getting has to do with the AnonymousType.

If anyone could point me in the right direction that would be fantastic. Thanks!

Answer 1

LINQ doesn't have an object model for your aliased suggestions.

I would create a model for this aliased ValueDocument:

public class ValueDocumentAlias
{
     public string Header {get;set;}
}

Then modify your code to look like this:

var suggestions = from v in db.ValueDocument
                  select new ValueDocumentAlias{ Header=v.HeaderTitle };

var namelist = suggestions.Where(n => n.Header.ToLower().StartsWith(term.ToLower()));

return this.Json(namelist, JsonRequestBehavior.AllowGet);