I have a droplist that lists the states, which when a state is selected it filters the cities for that state. It turns out that when I select cities it comes duplicated.
For example, I have states in select that are São Paulo, Minas Gerais e Espirito Santo , when I select Minas Gerais for example, it fires an ajax to consume cities that exist for that state. If I select Minas Gerais, it would have to appear only, Belo Horizonte, Betim, Contagem , it happens that Belo Horizonte, Betim, Contagem, Belo Horizonte, Betim, Contagem appears in duplicate form.
By analyzing the query return that the entity assembles, something like this
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Nome] AS [Nome]
FROM [dbo].[Cidade] AS [Extent1]
WHERE ([Extent1].[UfId] = 'MG') OR (([Extent1].[UfId] IS NULL) AND ('MG' IS NULL))
That really brings back the duplicate data.
The problem is that I do not understand why the entity is generating the query this way.
Follow my entity's function
[WebMethod]
[ScriptMethod(UseHttpGet = true)]
public JsonResult buscarCidades()
{
string estado = Request.QueryString["estado"];
var cidades = db.Cidade.Where(e => e.UfId == estado).Select(c => new { c.Id, c.Nome });
return Json(cidades, JsonRequestBehavior.AllowGet);
}
Thank you in advance