ASP.NET MVC 使用Remote特性实现远程属性验证

RemoteAttribute是asp.net mvc 的一个验证特性，它位于System.Web.Mvc命名空间

下面通过例子来说明

很多系统中都有会员这个功能，会员在前台注册时，用户名不能与现有的用户名重复，还要求输入手机号码去注册，同时手机号码也需要验证是否重复，下面是实体类

/// <summary>
/// 会员
/// </summary>
public class Member
{
    public int Id { get; set; }

    [Required(ErrorMessage = "请填写用户名")]
    [Remote("CheckName","Member",HttpMethod = "POST")]
    public string Name { get; set; }

    [Required(ErrorMessage = "请填写密码")]
    [StringLength(, ErrorMessage = "请填写6到16位的密码",MinimumLength = )]
    public string Password { get; set; }

    [Required(ErrorMessage = "请填写手机号码")]
    [RegularExpression(@"^1\d{10}$",ErrorMessage = "手机号码格式错误")]
    [Remote("CheckMobile", "Member", HttpMethod = "POST")]
    public string Mobile { get; set; }

}

Controller类

public class MemberController : Controller
    {
        // GET: Member
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult Create()
        {
            return View();
        }
        [HttpPost]
        public ActionResult Create(Member model)
        {
            if (ModelState.IsValid)
            {

            }
            return View(model);
        }
        [HttpPost]
        public JsonResult CheckName(string Name)
        {
            //这里假设已经有了test这个会员，如果注册时填写的也是test这个会员，则已存在会员，验证不通过
            //这里只是模拟，实际的情况是读取数据库等去判断是否存在该用户名的会员
            if (!string.IsNullOrWhiteSpace(Name) &&  Name.Trim() == "test")
            {
                return Json("用户名" + Name + "已存在", JsonRequestBehavior.AllowGet);
            }
            return Json(true, JsonRequestBehavior.AllowGet);
        }
        [HttpPost]
        public JsonResult CheckMobile(string Mobile)
        {
            //这里假设已经有了手机号码10000000000已经注册，如果使用该号码注册，则验证不通过
            //注意：这里的号码10000000000不具有真实性，只是举例使用
            //这里只是模拟，实际的情况是读取数据库等去判断是否存在该手机号码的会员
            if (!string.IsNullOrWhiteSpace(Mobile) && Mobile.Trim() == "")
            {
                return Json("手机号码已被注册", JsonRequestBehavior.AllowGet);
            }
            return Json(true, JsonRequestBehavior.AllowGet);
        }
    }

视图

@model RemoteDemoWeb.Models.Member

@{
    ViewBag.Title = "Create";
    Html.EnableClientValidation();
    Html.EnableUnobtrusiveJavaScript();
}

<h2>Create</h2>

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>Member</h4>
        <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.Password, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Password, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Password, "", new { @class = "text-danger" })
            </div>
        </div>

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

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

<div>
    @Html.ActionLink("Back to List", "Index")
</div>
@section scripts{

<script src="~/Scripts/jquery.validate.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.js"></script>
    }

这里调用了Html.EnableClientValidation(); 和Html.EnableUnobtrusiveJavaScript();   同时引入jquery.validate.js 和jquery.validate.unobtrusive.js

前台浏览，并填写信息

当填写存在的用户名和手机号码时

上面例子是基于ASP.NET MVC 5