First ,model It's through ef Automatic is the generated entity .

Adding model annotation means to automatically verify whether the information filled in by the user meets our requirements when registering ( That's what we need for this example )

Let's show you the effect first .

then Email You can only see the effect after you click Register

Now let's recall the process with me

We don't talk about entities anymore , No matter how you create it , Now let's talk about adding model annotations :

First add a class , Then add two important references to the namespace :

using System.ComponentModel;
using System.ComponentModel.DataAnnotations;

Here is a brief introduction MVC Common comments :

Required: Validation required

StringLength: Verify the maximum length of the field

Range: Verify field range

RegularExpression: Custom validation rules

DisplayName: Field display name

Then we write the code in our new class

First, make sure that the new class's namespace is consistent , If your entity class is built in the root of the project , And your annotation class is Models Under the folder , Then the above effect will not appear , I have encountered such problems when I was doing it

And then there's code time :

 public class EmailAttribute : RegularExpressionAttribute
public EmailAttribute()
: base(@"^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$")
} [MetadataType(typeof(UserMetadata))]
public partial class Tb_User
public string RePwd { get; set; }
/// <summary>
/// Add features to the entity class DisplayName
/// </summary>
public class UserMetadata
[DisplayName(" user name ")]
[Remote("NotExitesUserName", "Home",ErrorMessage=" The user account already exists ")]
public string UserName { get; set; }
/// <summary>
/// In the entity class is Remark Property settings DataType characteristic , Specify as multiline text
/// </summary>
[DisplayName(" remarks ")]
public string Remark { get; set; }
[DisplayName(" Age ")]
[Range(, )]
public int Age { get; set; }
[DisplayName(" password ")]
public string Pwd { get; set; }
[DisplayName(" Retype password ")]
public string RePwd { get; set; }
public string Email { get; set; } }

The annotation class is finished , We're going to write the controller

Add one HOME controller

The code is as follows :

 private NorthwindEntities1 db = new NorthwindEntities1();
// GET: /Home/
public ActionResult Register()
return View();
public ActionResult Register(Tb_User model)
if (ModelState.IsValid)
return RedirectToAction("Index");
return View();
public JsonResult NotExitesUserName()
string UserName = Request.Params["UserName"]; var user = db.Tb_User.Where(x => x.UserName == UserName).FirstOrDefault();
return user == null ? Json(true, JsonRequestBehavior.AllowGet) : Json(false, JsonRequestBehavior.AllowGet);
public ActionResult Index()
var user = db.Tb_User.ToList();
return View(user);

here private NorthwindEntities1 db = new NorthwindEntities1(); It's the model of my entity class , use EF add to ADO.NET Created by entity

And then there's the corresponding add view

First of all Register View :

<script src="~/Scripts/jquery-1.8.2.min.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script> <h2>@ViewBag.Title</h2>
<table><tr><td>@Html.DisplayNameFor(x=>x.UserName):</td><td>@Html.TextBoxFor(x=>x.UserName) @Html.ValidationMessageFor(x=>x.UserName)</td></tr>
<tr><td colspan=""><input type="submit" value=" register "/></td></tr>

The steps to create a view here are :

among Script You can pull it yourself , You can also tap with your hands .

Add again Index View , This is a direct reference to List Templates

So basically OK 了 , And then run the project , First add a test data , Then the verification can achieve the effect we showed at the beginning of the above

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