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ASP.NET MVC中使用FluentValidation驗證實體

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　　1、FluentValidation介紹

　　FluentValidation是與ASP.NET DataAnnotataion Attribute驗證實體不同的資料驗證組件，提供了將實體與驗證分離開來的驗證方式，同時FluentValidation還提供了運算式鏈式文法。

　　2、安裝FluentValidation

　　FluentValidation地址：http://fluentvalidation.codeplex.com/

　　使用Visual Studio的管理NuGet程式包安裝FluentValidation及FluentValidation.Mvc

　　3、通過ModelState使用FluentValidation驗證

　　項目解決方案結構圖：

　　

　　實體類Customer.cs:

using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace Libing.Portal.Web.Models.Entities{    public class Customer    {        public int CustomerID { get; set; }        public string CustomerName { get; set; }        public string Email { get; set; }        public string Address { get; set; }        public string Postcode { get; set; }        public float? Discount { get; set; }        public bool HasDiscount { get; set; }    }}

　　資料驗證類CustomerValidator.cs：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using FluentValidation;using Libing.Portal.Web.Models.Entities;namespace Libing.Portal.Web.Models.Validators{    public class CustomerValidator : AbstractValidator<Customer>    {        public CustomerValidator()        {            RuleFor(customer => customer.CustomerName).NotNull().WithMessage("客戶名稱不可為空");            RuleFor(customer => customer.Email)                .NotEmpty().WithMessage("郵箱不可為空")                .EmailAddress().WithMessage("郵箱格式不正確");            RuleFor(customer => customer.Discount)                .NotEqual(0)                .When(customer => customer.HasDiscount);            RuleFor(customer => customer.Address)                .NotEmpty()                .WithMessage("地址不可為空")                .Length(20, 50)                .WithMessage("地址長度範圍為20-50位元組");        }    }}

　　控制器類CustomerController.cs：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using FluentValidation.Results;using Libing.Portal.Web.Models.Entities;using Libing.Portal.Web.Models.Validators;namespace Libing.Portal.Web.Controllers{    public class CustomerController : Controller    {        public ActionResult Index()        {            return View();        }        public ActionResult Create()        {            return View();        }        [HttpPost]        public ActionResult Create(Customer customer)        {            CustomerValidator validator = new CustomerValidator();            ValidationResult result = validator.Validate(customer);            if (!result.IsValid)            {                result.Errors.ToList().ForEach(error =>                {                    ModelState.AddModelError(error.PropertyName, error.ErrorMessage);                });            }            if (ModelState.IsValid)            {                return RedirectToAction("Index");            }            return View(customer);        }    }}

　　View頁面Create.cshtml，該頁面為在添加View時選擇Create模板自動產生：

@model Libing.Portal.Web.Models.Entities.Customer@{    Layout = null;}<!DOCTYPE html><html><head>    <meta name="viewport" content="width=device-width" />    <title>Create</title></head><body>    @using (Html.BeginForm())     {        @Html.AntiForgeryToken()                <div class="form-horizontal">            <h4>Customer</h4>            <hr />            @Html.ValidationSummary(true)                <div class="form-group">                @Html.LabelFor(model => model.CustomerName, new { @class = "control-label col-md-2" })                <div class="col-md-10">                    @Html.EditorFor(model => model.CustomerName)                    @Html.ValidationMessageFor(model => model.CustomerName)                </div>            </div>                <div class="form-group">                @Html.LabelFor(model => model.Email, new { @class = "control-label col-md-2" })                <div class="col-md-10">                    @Html.EditorFor(model => model.Email)                    @Html.ValidationMessageFor(model => model.Email)                </div>            </div>                <div class="form-group">                @Html.LabelFor(model => model.Address, new { @class = "control-label col-md-2" })                <div class="col-md-10">                    @Html.EditorFor(model => model.Address)                    @Html.ValidationMessageFor(model => model.Address)                </div>            </div>                <div class="form-group">                @Html.LabelFor(model => model.Postcode, new { @class = "control-label col-md-2" })                <div class="col-md-10">                    @Html.EditorFor(model => model.Postcode)                    @Html.ValidationMessageFor(model => model.Postcode)                </div>            </div>                <div class="form-group">                @Html.LabelFor(model => model.Discount, new { @class = "control-label col-md-2" })                <div class="col-md-10">                    @Html.EditorFor(model => model.Discount)                    @Html.ValidationMessageFor(model => model.Discount)                </div>            </div>                <div class="form-group">                @Html.LabelFor(model => model.HasDiscount, new { @class = "control-label col-md-2" })                <div class="col-md-10">                    @Html.EditorFor(model => model.HasDiscount)                    @Html.ValidationMessageFor(model => model.HasDiscount)                </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>    }</body></html>

　　運行效果：

　　

 

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