Asp.net MVC 的 Model验证

通常咱们作验证都是前端验证加后台验证，然而在MVC里 咱们能够在Model层就能够

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
namespace mytest2.Models
{
    public class guests
    {
        [Key]
        [Required(ErrorMessage="请输入名字")]
        public string name { get; set; }
         [Required(ErrorMessage = "请输入电话号码")]
        public string phone { get; set; }
    }
}

[HttpPost]
        public ActionResult Guest(guests guests)
        {
            if(ModelState.IsValid)
            {
                return Content("success");
            }
            else
            {
                if(string.IsNullOrEmpty(guests.name))
                {
                    ModelState.AddModelError("name","姓名不能为空");
                }
                 
            }
            return View();
        }

<form   method="post">
        <span>第一个 </span>
        @Html.ValidationSummary(true)
        <span></span><input id="name" name="name" />
        <p>@Html.ValidationMessageFor(m => m.name)</p>
        <span></span><input id="phone" name="phone" />
        <p>@Html.ValidationMessageFor(m => m.phone)</p>
        <button type="submit" >anniu</button>
        </form>