MVC Model Validation

Model the validation tokens that can be added in a class:

1. Required Fields

[Required]

public string FirstName {get; set;}

2. field Length

Up to n bits:

[Stringlength (160)]

public string FirstName {get; set;}

Requires at least n bits:

[Stringlength (Minimumlength=3)]

public string FirstName {get; set;}

3. Regular Validation

[RegularExpression (@ "[A-za-z0-9._%+-][email protected][a-za-z0-9.-]+\.[ a-za-z]{2,4} ")]

public string Email {get; set;}

4. Scope

[Range (35,44)]

public int Age {get; set;}

The case of decimals:

[Range (typeof (Decimal), "0.00", "49.99")]

Public decimal price {get; set;}

5. Validation of service-side participation

[Remote ("Checkusername", "account")]

public string UserName {get; set;}

Then specify a Checkusername method in the AccountController:

Public Jsonresult Checkusername (string username) {    var result = Membership.findusersbyname (username). Count = = 0;    return Json (result, jsonrequestbehavior.allowget);}

　　

6. Compare

[RegularExpression (@ "[A-za-z0-9._%+-][email protected][a-za-z0-9.-]+\.[ a-za-z]{2,4} ")]

public string Email {get; set;}

[Compare ("Email")]

public string Emailconfirm {get; set;}

7. custom Error Messages

Regular:

[RegularExpression (@ "[A-za-z0-9._%+-][email protected][a-za-z0-9.-]+\.[ a-za-z]{2,4} ",

errormessage= "Email doesn ' t look like a valid email address.")

public string Email {get; set;}

Normal text:

[Required (errormessage= "Your Last name was Required")]

[Stringlength (errormessage=, Your Last name was too long ")]

public string LastName {get; set;}

PLACEHOLDER:

[Required (errormessage= "Your {0} is Required.")]

[Stringlength (errormessage= "{0} is too long.")]

public string LastName {get; set;}

third, backstage action the wording

There are two things to do in action: to determine if a modelstate is legitimate, and to add an error message. The login action that comes with the MVC3 template is as follows:

[Httppost]public actionresult LogOn (Logonmodel model, string returnUrl) {    if (modelstate.isvalid)    {        if ( Membership.ValidateUser (model. UserName, model. Password))        {            Formsauthentication.setauthcookie (model. UserName, model. RememberMe);            if (Url.islocalurl (RETURNURL) && returnurl.length > 1 && returnurl.startswith ("/")                &&! Returnurl.startswith ("//") &&!returnurl.startswith ("/\\"))            {                return Redirect (RETURNURL);            }            else            {                return redirecttoaction ("Index", "Home");            }        }        else        {            modelstate.addmodelerror ("", "the user name or password provided is incorrect.");        }    }     If we got this far, something failed, redisplay form    return View (model);

　　

Original address: http://www.cnblogs.com/yeagen/archive/2012/09/24/2700836.html

MVC Model Validation