Entity Framework 中错误“Validation failed for one or more entities. See 'EntityValidationErrors' property for more details”

大家好！我是 C# 和 Entity Framework 的新手，使用的是 4.1 版本。尝试通过 `SaveChanges()` 将数据保存到数据库时，总是抛出异常，内容为：“Validation failed for one or more entities. See 'EntityValidationErrors' property for more details”。 这是我的代码： ```csharp using (var context = new MyDbContext()) { var user = new User { Name = "John", Email = "", // 空字符串 Age = -5, // 负值 CreatedDate = DateTime.Now }; context.Users.Add(user); context.SaveChanges(); // 这里出错 } ``` User 模型如下： ```csharp public class User { public int Id { get; set; } [Required] [StringLength(50)] public string Name { get; set; } [Required] [EmailAddress] public string Email { get; set; } [Range(0, 120)] public int Age { get; set; } public DateTime CreatedDate { get; set; } } ```