asp.net mvc 唯一性验证

刚接触asp.net mvc，很多地方都不懂，边写边学习，有不对的地方请多多指正。

问题

用户唯一性验证，新建用户时判断用户名唯一性，修改时用户名不进行修改，所以不需要验证，搞了半天才找到适合的方法，网上找了一下，有用Remote Validation的，也有用ValidationAttribute的，都试了一下，ValidationAttribute是保存后校验，感觉有点怪味道，Remote Validation是客户端验证，符合我的需要。下面是Remote Validation实现的唯一性验证。

实现

Remote控制器

using MVC.StaticData;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MVC.Controllers
{
    public class MyRemoteController : Controller
    {
        // GET: MyRemote
        public JsonResult RemoteValidate(string name) //这里的参数名字，必须要和视图中文本框控件的名字一样，但大小写无所谓
        {
            //如果存在用户名,即isExists=true
            bool isExists = MyRemoteStaticData.RemoteList.
                Where(s => s.Name.ToLowerInvariant().
                    Equals(name.ToLower())).FirstOrDefault() != null;
            //就向前台返回false，表明已经存在userName
            return Json(!isExists,JsonRequestBehavior.AllowGet);
        }
}

model实体

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MVC.Models
{
    public class User
    {
        [Remote("RemoteValidate", "MyRemote", ErrorMessage = "抱歉用户名已经存在！请重新输入！！！")]
        public string Name { get; set; }
        public string Email { get; set; }
    }
}

新建视图

@model MVC.Models.User

@{
    ViewBag.Title = "新建用户";
}

<h2>新建用户</h2>

@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()
    
<div class="form-horizontal">
    <hr />
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })

    <div class="form-group">
        @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model =>model.Name, "", new { @class = "text-danger" })
        </div>
    </div>


    <div class="form-group">
        @Html.LabelFor(model => model.Email , htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Email, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Email, "", new { @class = "text-danger" })
        </div>
    </div>

     <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" value="新建" class="btn btn-default" />&nbsp;&nbsp;
        </div>
    </div>
</div>
}

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

修改视图，这里用户名设置为隐藏

@model MVC.Models.User

@{
    ViewBag.Title = "用户信息修改";
}

<h2>用户信息修改</h2>

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    
<div class="form-horizontal">
    <hr />
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    @Html.HiddenFor(model => model.Id)
    @Html.HiddenFor(model => model.Name)

    <div class="form-group">
        @Html.LabelFor(model => model.Mail, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Mail, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Mail, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" value="保存" class="btn btn-default" /> &nbsp;&nbsp;
        </div>
    </div>
</div>
}

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

参考
MVC学习系列13--验证系列之Remote Validation