MVC4 Making Web Tutorials Chapter II Practical skills of user login 2.2_

A user
1.1 User Registration
1.2 User Login

First, add the user login model class Userlogin in models, which uses only three fields of user name, password and authentication code.

<summary>
 ///User Login model
 ///</summary> public
 class Userlogin
 {
 ///<summary>
 ///username
 ///</summary>
 [Display (name = "Username", Description = "4-20 characters.") ")]
 [Required (errormessage =" x ")]
 [Stringlength (minimumlength = 4, errormessage =" x ")] public
 String UserName {get; set;}
 <summary>
 ///password
 ///</summary>
 [Display (Name = "password", Description = "6-20 characters.") ")]
 [Required (errormessage =" x ")]
 [Stringlength (minimumlength = 6, errormessage =" x ")]
 [DataType ( Datatype.password)] public
 string Password {get; set;}
 <summary>
 ///Verification Code
 ///</summary>
 [Display (Name = "Captcha", Description = "Enter the verification code in the picture.") ")]
 [Required (errormessage =" x ")]
 [Stringlength (6, minimumlength = 6, errormessage =" x ")]
 public String Verificationcode {get; set;}

 }

Add the login action to the Usercontroller, and the code looks as follows:

Public ActionResult Login ()
 {return
  View ();
 }
 [HttpPost]
 Public ActionResult Login (userlogin login)
 {return
  View ();
 }

Use cookies to save login account, password and other information, modify public actionresult login (userlogin login). Modify the completion code as follows:

[HttpPost] public actionresult login (userlogin login) {//Verify authentication code if (session["verificationcode"] = = NULL | | session["Verificationcode"]. ToString () = = "") {Error _e = new Error {Title = "Authentication code does not exist", Details = "When the user registers, the server side of the authentication code is empty, or the authentication code submitted to the server is empty", cause = " ;li> the time you sign up for the registration page has timed out </li><li> you have bypassed the client validation to submit data to the server </li> ", Solution =" return <a href= ' "+
  Url.action ("register", "User") + "' > Registration </a> page, reload after registration"};
  Return redirecttoaction ("Error", "Prompt", _e); else if (session["Verificationcode"). ToString ()!= login.
  Verificationcode.toupper ()) {Modelstate.addmodelerror ("Verificationcode", "X");
  return View ();
  //Verify account password Userrsy = new Userrepository (); If Userrsy.authentication (login. UserName, Common.Text.Sha256 (login.
  Password) = = 0) {HttpCookie _cookie = new HttpCookie ("User"); _cookie. Values.add ("UserName", login.)
  UserName); _cookie. Values.add ("Password", Common.Text.Sha256) (login.
  Password));
  RESPONSE.COOKIES.ADD (_cookie); RetuRN redirecttoaction ("Default", "User"); else {modelstate.addmodelerror ("message", "Login failed!")
  ");
  return View ();

 }

 }

Right-click on public ActionResult Login () to add the enhanced type view

Login.cshtml to complete the offspring

@model CMS.
 Models.userlogin @{viewbag.title = "User Login";
Layout = "~/views/shared/_layout.cshtml"; } <div class= "banner" >  </div> @using (html.begin Form ()) {@Html. ValidationSummary (True) <div class= "form" > <dl> <dt> User Login </dt> <dd& 
  Gt <div class= "label" > @Html. Labelfor (model => model. UserName):</div> <div class= "Ctrl" > @Html. Editorfor (model => model. UserName) @Html. Validationmessagefor (model => model. UserName) @Html. Displaydescriptionfor (model => model. UserName) </div> </dd> <dd> <div class= "label" > @Html. Labelfor (model => model. Password):</div> <div class= "Ctrl" > @Html. Passwordfor (model => model. Password) @Html. Validationmessagefor (model => model. Password) @Html. Displaydescriptionfor (model => model. Password) </div> </dd> <dd> <divclass= "Label" > Authenticode:</div> <div class= "Ctrl" > @Html. Textboxfor (model => model. Verificationcode) @Html. Validationmessagefor (model => model. Verificationcode)  <a I D= "Trydifferent" style= "Cursor:pointer" > Change a </a> </div> </dd> <dd> <div class= "L Abel "></div> <div class=" Ctrl "> <input type=" Submit "value=" Landing "/> @Html. Validationmessage (" Mes 
  Sage "); </div> </dd> </dl> <div class= "clear" ></div> </div>} <script type= "text/ JavaScript "> $ (" #trydifferent "). Click (function () {$ (" #verificationcode "). attr (" src ","/user/verificationcode? ") 
 + new Date ());

 }) </script> @section Scripts {@Scripts. Render ("~/bundles/jqueryval")}

Browser to view the landing page

Click on the landing test. OK login Successful

Verify that the user has logged in, this block, together with permission validation, inherits a custom validation class from the Authorizeattribute

Add a Extensions folder to the project, add a class userauthorizeattribute inherit from Authorizeattribute, rewrite the Authorizecore method to implement the validation that the user has logged in, Permission validation is added when Write permission function

 using Ninesky.repository; namespace SYSTEM.WEB.MVC {///<summary>///user Rights authentication///</summary> public class Userauthorizeattribute:au Thorizeattribute {///<summary>///core "Verifying user Login"///</summary>///<param name= "HttpContext" >< /param>///<returns></returns> protected override bool Authorizecore (HttpContextBase HttpContext) {/
  /check if cookies["user" exists if (httpcontext.request.cookies["user"] = = null) return false;
  Verify that the username password is correct httpcookie _cookie = httpcontext.request.cookies["User";
  String _username = _cookie["UserName"];
  String _password = _cookie["password"];
  HttpContext.Response.Write ("User name:" +_username); if (_username = = "" | |
  _password = = "") return false;
  Userrepository _userrsy = new Userrepository ();
  if (_userrsy.authentication (_username, _password) = = 0) return true;
 else return false; }
 }
}

In the future, you can verify that you have logged in by adding [Userauthorize] on the action or controller that you need to log on.
Exit function, add logout Action in Usercontroller

<summary>
 ///exit system
 ///</summary>
 ///<returns></returns>
 Public ActionResult Logout ()
 {
  if (request.cookies["User"!= null)
  {
  HttpCookie _cookie = request.cookies[" User "];
  _cookie. Expires = DateTime.Now.AddHours ( -1);
  RESPONSE.COOKIES.ADD (_cookie);
  }
  Notice _n = new Notice {Title = "successful Exit", Details = "You have successfully quit!" ", Dwelltime = 5, navigationname=" Homepage ", Navigationurl = Url.action (" Index "," Home ")};
  Return redirecttoaction ("Notice", "Prompt", _n);
 }

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