1、FluentValidation介绍
FluentValidation是与ASP.NET DataAnnotataion Attribute验证实体不同的数据验证组件，提供了将实体与验证分离开来的验证方式，同时FluentValidation还提供了表达式链式语法。
2、安装FluentValidation
FluentValidation地址：http://fluentvalidation.codeplex.com/
使用Visual Studio的管理NuGet程序包安装FluentValidation及FluentValidation.Mvc
3、通过ModelState使用FluentValidation验证
项目解决方案结构图：
实体类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; } ???}}数据验证类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("客户名称不能为空"); ???????????RuleFor(customer => customer.Email) ???????????????.NotEmpty().WithMessage("邮箱不能为空") ???????????????.EmailAddress().WithMessage("邮箱格式不正确"); ???????????RuleFor(customer => customer.Discount) ???????????????.NotEqual(0) ???????????????.When(customer => customer.HasDiscount); ???????????RuleFor(customer => customer.Address) ???????????????.NotEmpty() ???????????????.WithMessage("地址不能为空") ???????????????.Length(20, 50) ???????????????.WithMessage("地址长度范围为20-50字节"); ???????} ???}}控制器类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页面Create.cshtml，该页面为在添加View时选择Create模板自动生成：
@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>运行效果：
4、通过设置实体类Attribute与验证类进行验证
修改实体类Customer.cs：
using System;using System.Collections.Generic;using System.Linq;using System.Web;using FluentValidation.Attributes;using Libing.Portal.Web.Models.Validators;namespace Libing.Portal.Web.Models.Entities{ ???[Validator(typeof(CustomerValidator))] ???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; } ???}}修改Global.asax.cs：
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using System.Web.Routing;using FluentValidation.Attributes;using FluentValidation.Mvc;namespace Libing.Portal.Web{ ???public class MvcApplication : System.Web.HttpApplication ???{ ???????protected void Application_Start() ???????{ ???????????AreaRegistration.RegisterAllAreas(); ???????????RouteConfig.RegisterRoutes(RouteTable.Routes); ???????????// FluentValidation设置 ???????????DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false; ???????????ModelValidatorProviders.Providers.Add(new FluentValidationModelValidatorProvider(new AttributedValidatorFactory())); ???????} ???}}ASP.NET MVC中使用FluentValidation验证实体
原文地址：http://www.cnblogs.com/sjqq/p/7630215.html