MVC form validation step

Original link: http://www.cnblogs.com/atlj/p/8876329.html

ASP.NET MVC validation attributes

      Apply validation rules to the model support; a SysTem.CompontModel.DataAnnotions namespace; ValidationAttribute inherits from class, the basic properties of a message used to define the attributes ErrorMessage

       Required: Required verification

       Compare: Compare verify, verify that the two values ​​match

       StringLength: authentication string length (the maximum length of the individual may be provided, may be provided while minimizing the length)

       Range: for digital (integers and floating point), and other types of time data range validation

        RegularExpression: Regular expression validation

 

 

First, the definition of validation rules

    1, the reference in the Models:

        Framework: System.Web

        Extended: System.CompanentModel.DataAnnotaions

        Framework: System.Web.Mvc

    2, the entity class references:

         using System.CompanentModel

         using System.CompanentModel.DataAnnotaions

         using  System.Web.MVC

Second, the application validation rules

        1, a plurality of rules can be bound by the same property. Disposed in front of the class attributes.

             Text on [the DisplayName ( "Age")] placeholder

             [Required (ErrorMessage = "{0} is not empty")]

             [Range (18,60, ErrorMessage = "{0} must {1} and {2} between")]

             ? Public int Age {get; set;} represents null type "?"

          2, use strong typing Razor view engine;

          3, with the view names subject attribute name is exactly

          4, the controller in combination with a database verification

          Forms and model validation relationships: the definition of validation rules in the model, ASP.NET MVC when mapping the data to the model, validation rules are automatically applied based on the model;

          Verification process, will automatically add the validation error messages to ModelState data dictionary.

          ModelState common members: 

          isValid: verify the classification model by all

          AddModelError (key.value): Add a custom error messages

 

 

Third, verify the information displayed

     1, in two ways:

              Method a: ModelState theoretically possible to use the authentication information object to output, but more complicated;

              Method two: in practice, the use of two Html object methods to help verify the information output

                          MvcHtmlString ValidationMessage (string modelName): Html view helper. Displays the authentication information field (text box displayed behind the verification information, or below, in a location to be displayed on it)

                          MvcHtmlString ValidationSummary (): show all fields authentication information.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

                  

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