我是新的entityframework,我開始這段代碼,但我不知道爲什麼我有一個異常處理程序「System.Data。 Entity.ModelConfiguration.ModelValidationException'發生在EntityFramework.dll「in line var count = context.Albums.Count();System.Data.Entity.ModelConfiguration.ModelValidationException發生在EntityFramework.dll在C#中的CONSOL應用程序
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.Entity;
namespace entityframework1
{
class Program
{
static void Main(string[] args)
{
using (var context = new MusicAlbumContext())
{
var count = context.Albums.Count();
Console.WriteLine(count);
context.Albums.Add(new Album() { Name = "best", Cost = 34.43m });
context.SaveChanges();
Console.WriteLine(count);
Console.Read();
}
}
}
public class MusicAlbumContext:DbContext
{
public DbSet<Album> Albums { get; set; }
}
public class Album
{
public string Name { get; set; }
public decimal Cost { get; set; }
}
}
在異常中應該有更多的信息,它是什麼意思? – DavidG
我敢打賭,這與你的模特沒有ID有關。添加[DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int id {get;組; } – KnuturO
@knuturO是的,這是真的;非常感謝你;我應該在Album類中定義一個Id字段 –