ASP.NET MVC中使用FluentValidation验证实体

谁践踏了优雅 2021-06-26 16:06 384阅读 0赞

## 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/][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：  
![在这里插入图片描述][20190103215216488.png]  
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：  
![在这里插入图片描述][20190103215514384.png]

## 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()));
            }
        }
    }

[http_fluentvalidation.codeplex.com]: http://fluentvalidation.codeplex.com/
[20190103215216488.png]: /images/20210626/588fd5a30d30493bb36838a3420ef0be.png
[20190103215514384.png]: /images/20210626/58bfb436945b43009aaeae7e8dc3cef2.png