MVC3----Data annotations and Validation (2) detailed remote verification and compare verification

Remote verification

Profile:

If you want to implement the same as user registration, do not allow duplicate accounts, you can use Remote authentication. The remote feature allows client-side validation logic to be performed using the server's callback function. It just enters the character in the text box to submit a GET request to the server, remote authentication only supports input time verification, does not support the validation when committed, there is a certain security risk. So we have to verify at the time of submission that the validation failed and add the Modelerror

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Realize:

-------Model Code:

Using system;using system.collections.generic;using system.linq;using system.web;using  System.Data.Entity;using System.ComponentModel;using System.ComponentModel.DataAnnotations; using system.web.mvc;//the required namespace namespace schoolmanagedomw.models{    public  class schooltype    {        [key]         public virtual int st_id { get; set;  }        //        the method to invoke              Controller name          [remote ("Checkusername",  "Schooltype")]//remote validation          public virtual string st_name{get;set;}                 public virtual list<school> schools { get; set; }     }}

-------Controller code:

The name control you need:

Using System.Web.Security;
Using System.Web.UI;

       private SchoolDBContext db = new  Schooldbcontext ();        /// <summary>         ///  define a method to make a unique judgment         ///  </summary>        /// <param name= "St_name" >< /param>        /// <returns></returns>         private bool isdistinctstname (String st_name)          {             if  (db. Schooltypes.where (R => r.st_name == st_name). ToList (). count > 0)                  return true;            else                 return false;        }                  ///  <summary>        ///  called methods          /// </summary>        /// < Param name= "St_name" ></param>        /// < Returns></returns>        [outputcache (Location =  Outputcachelocation.none, nostore = true)]//plus Clear Cache          public jsonresult checkusername (String st_name)          {            if  (Isdistinctstname (st_name))              {                 return json ("User name is not unique",  jsonrequestbehavior.allowget);             }             else            {                 return json ( True, jsonrequestbehavior.allowget);             }        }                         [HttpPost]      &nbSp;  public actionresult create (Schooltype schooltype)          {            //submit to server to make a judgment              if  (Isdistinctstname (schooltype.st_name ))             {                 modelstate.addmodelerror ("St_name",  " The user name is not unique ");            }             if  (modelstate.isvalid)              {                 db. Schooltypes.add (schooltype);             &Nbsp;   db. SaveChanges ();                 Return redirecttoaction ("Index");               }            return view ( Schooltype);         }

 -----View Code:

@model  SchoolManageDomw.Models.SchoolType@{    ViewBag.Title =  "Create";} 
Compare verification
Profile:
If you need to compare validation, such as whether the password is consistent, etc., you can verify with compare
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Realize:
-----Model Code:
Using system;using system.collections.generic;using system.linq;using system.web;using  System.Data.Entity;using System.ComponentModel;using System.ComponentModel.DataAnnotations; Using system.web.mvc;namespace schoolmanagedomw.models{    public class  SchoolType    {        [Key]         public virtual int st_id { get; set; }         [required]  //not allowed to empty          public virtual string st_name{get;set;}         [compare ("St_name")]         public virtual string st_nameConfirm { get; set; }         public virtual list<school> schools { get; set; }    }} 
-----View Code:
@model  SchoolManageDomw.Models.SchoolType@{    ViewBag.Title =  "Create";} 
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MVC3----Data annotations and Validation (2) detailed remote verification and compare verification