ASP.NET MVC 三层合作-数据验证-木庄网络博客

本文摘自PHP中文网，作者jacklove，侵删。

首先我们在M层创建一个类：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
namespace WebApplication1.Models
{
    public class GuestResponse
    {
        //数据验证，必填项，如果不填ErrorMessage 请输入你的用户名
        [Required(ErrorMessage = "请输入你的用户名！")]
        public string Name { get; set; }
        //同上
        [Required(ErrorMessage = "请输入邮箱")]
        //正则表达式，判断是否是邮箱格式
        [RegularExpression(".+\\@.+\\..+",
        ErrorMessage = "请输入正确的邮箱格式")]
        public string Email { get; set; }
        //同上
        [Required(ErrorMessage = "请输入你的手机号码")]
        public string Phone { get; set; }
        public bool? WillAttend { get; set; }
    }
}

代码中已有注释，不多说。

下面，V层：

@model WebApplication1.Models.GuestResponse
@{
    Layout = null;
}
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>RsvpForm</title>
</head>
<body>
    @using (Html.BeginForm())
    {
        @Html.ValidationSummary()
        <p>Your name: @Html.TextBoxFor(x => x.Name) </p>
        <p>Your email: @Html.TextBoxFor(x => x.Email)</p>
        <p>Your phone: @Html.TextBoxFor(x => x.Phone)</p>
        <p>
            Will you attend?
            @Html.DropDownListFor(x => x.WillAttend, new[] {
            new SelectListItem() {Text = "Yes, I'll be there",
            Value = bool.TrueString},
            new SelectListItem() {Text = "No, I can't come",
            Value = bool.FalseString}
            }, "Choose an option")
        </p>
        <input type="submit" value="Submit RSVP" />
    }
</body>
</html>

这里注意第一行，

1	`@model WebApplication1.Models.GuestResponse`

我们绑定我们写的数据类，这样我们才能顺利创建表单。

然后是C层：

[HttpGet]
       public ViewResult RsvpForm() {
           return View();
       }
       [HttpPost]
       public ViewResult RsvpForm(GuestResponse model)
       {
           if (ModelState.IsValid)
           {
               // TODO: Email response to the party organizer
               return View("Thanks", model);
           }
           else
           {
               // there is a validation error
               return View();
           }
       }

这里我们有两个RsvpForm，我们在上面添加提交方式，分别是Get和Post

1	`if` `(ModelState.IsValid)`

是否通过数据验证，通过返回视图Thanks，且把表单传过来的值传给Thanks视图

数据验证不通过，返回原视图，

这里注意V层

1	`@Html.ValidationSummary()`

添加这句话，在数据验证的时候，数据不通过，视图层才能显示我们的错误提示信息。

运行截图演示：

我们只输入了姓名，其他没有输入，提示错误信息

我们输入一个正确的：

然后点击，调到Thanks视图，Thanks视图代码如下：

@model WebApplication1.Models.GuestResponse
 
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Thanks</title>
</head>
<body>
    <p> 
        <h1>Thank you, @Model.Name!</h1>
        @if (Model.WillAttend == true)
        {
            @:It's great that you're coming. The drinks are already in the fridge!
}
        else
        {
            @:Sorry to hear that you can't make it, but thanks for letting us know.
}
    </p>
</body>
</html>