EF 验证

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ModelState.IsValid  验证是否通过

ModelState.AddModelError("Name", "Name is required");  返回错误信息

eg：

 [HttpPost]
         public ActionResult ModelStateAction(ModelStateModel model)
         {
             if (string.IsNullOrEmpty(model.Name))
             {
                 ModelState.AddModelError("Name", "Name is required");
             }
             if (string.IsNullOrEmpty(model.Email))
             {
                 ModelState.AddModelError("Email", "Email is required");
             }
             else
             {
                 string expression = @"^\s*([A-Za-z0-9_-]+(\.\w+)*@([\w-]+\.)+\w{2,3})\s*$";
                 Regex reg = new Regex(expression);
                 if(!reg.IsMatch(model.Email))
                 {
                     ModelState.AddModelError("Email", "Email is invalid");
                 }             
             }
             if (ModelState.IsValid)
             {
                 ViewBag.Name = model.Name;
                 ViewBag.Email = model.Email;
            }
             return View(model);
         }

@Html.ValidationSummary() 会把所有验证不通过的信息逐条显示出来

@Html.ValidationMessageFor(model => model.Name)显示属性对应的验证错误信息

上面的例子是手动加验证，还提供了DataAnnotations

using System.ComponentModel.DataAnnotations;

 using System.ComponentModel.DataAnnotations;
  
 namespace SlarkInc.Models
{
   public class DataAnnotationModel
     {
        [Required(ErrorMessage = "Name is required")]
         public string Name { get; set; }

        [Required(ErrorMessage = "Email is required")]
         [RegularExpression(@"^\s*([A-Za-z0-9_-]+(\.\w+)*@([\w-]+\.)+\w{2,3})\s*$", ErrorMessage = "Email is invalid")]
        public string Email { get; set; }
    }
 }

客户端验证  

 <configuration>
   <appSettings>
     <add key="ClientValidationEnabled" value="true" />
     <add key="UnobtrusiveJavaScriptEnabled" value="true" />
   </appSettings>
 </configuration>

数据
连接  <add name="DefaultConnection" connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\EFDemo.mdf;Integrated Security=True"  providerName="System.Data.SqlClien/>
操作

Enable-Migrations 初始化数据迁移

Add-Migration dsl 添加数据迁移记录

Update-Database 更新数据库。 

EF 验证

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原文地址：http://www.cnblogs.com/xtsnet/p/5789688.html