Ho questa azione che riceve un parametro e voglio stampare tutti i risultatiEntityType 'x' non ha una chiave definita. Definire la chiave per questo EntityType
public ActionResult MusicaGenero(string genero) {
//should return more than 30 rows
var results = con.artista.Where(x=>x.genero==genero);
return View(results);
}
MusicaGenero avere questo
@model IEnumerable<MvcApplication1.Models.detallesMusica>
@{
ViewBag.Title = "MusicaGenero";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Musica del genero de: @ViewBag.genero</h2>
<ul>
@foreach(var detallesMusica in Model)
{
<li>@detallesMusica.artista</li>
<li>@detallesMusica.nombre</li>
<li>@detallesMusica.publicado</li>
<li>@detallesMusica.costo</li>
}
</ul>
Come può, ma viene generata un'eccezione
\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'album' has no key defined. Define the key for this EntityType.
\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'genero' has no key defined. Define the key for this EntityType.
\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'artista' has no key defined. Define the key for this EntityType.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'albums' is based on type 'album' that has no keys defined.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'generos' is based on type 'genero' that has no keys defined.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'artista' is based on type 'artista' that has no keys defined.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.Entity.ModelConfiguration.ModelValidationException: One or more validation errors were detected during model generation:
\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'album' has no key defined. Define the key for this EntityType.
\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'genero' has no key defined. Define the key for this EntityType.
\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'artista' has no key defined. Define the key for this EntityType.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'albums' is based on type 'album' that has no keys defined.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'generos' is based on type 'genero' that has no keys defined.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'artista' is based on type 'artista' that has no keys defined.
qual è il problema qui? Ho aggiunto già una chiave ma continuo a darmi quell'errore.
Avremo bisogno di vedere il codice per le vostre entità. –
Sembra che manchi alcuni attributi di '[Chiave]' da quelle classi di entità. – mattytommo