[Key]           //关键字

 [Required]           //不为空

 [Display(Name = "ID")]

  public int id { get; set; }

[Display(Name = "出发日期")]

[Required]

[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]       //年月日的格式

 public DateTime? date { get; set; }

[Display(Name = "现行年度")]

[Range(, , ErrorMessage = "输入范围是[2018至2100]")]

 public int year { get; set; }

[Display(Name = "邮件昵称")]

[Required]

[StringLength()]     //长度

public string email { get; set; }

[Display(Name = "内容")]

[DataType(DataType.MultilineText)]    //最大值

[Required]

 public string content { get; set; }

[Display(Name = "性质")]

 public ICollection<System.Web.Mvc.SelectListItem> choose { get; set; }