У меня есть это действие, которое принимает параметр и я хочу, чтобы распечатать все результатыEntityType 'x' не имеет определенного ключа. Определите ключ для этого 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 имеют этот
@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>
Как можно, но он бросает исключение
\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.
В чем проблема? Я добавил уже ключ, но все же даю мне эту ошибку.
Нам нужно будет увидеть код для ваших объектов. –
Похоже, что вам не хватает некоторых атрибутов '[Key]' из этих классов сущностей. – mattytommo