ASP. Vnext modelbinding

Model Binding

The Model binding (binding) is simply the assignment of the action parameter by traversing the data obtained by the Valueprovider (value provider).

In the course of this tutorial, you should have a basic understanding of model binding.

Defaultpropertybindingpredicateprovider

Defaultpropertybindingpredicateprovider: Provides an expression-based method to provide the included properties.

     Public classDefaultpropertybindingpredicateprovider<tmodel>: IpropertybindingpredicateproviderwhereTModel:class        {         PublicDefaultpropertybindingpredicateprovider ();         Public Virtual stringPrefix {Get; }          Public VirtualFunc<modelbindingcontext,string,BOOL> PropertyFilter {Get; }          Public VirtualIenumerable<expression<func<tmodel,Object>>> Propertyincludeexpressions {Get; } }

This class has three properties:

Prefix represents the prefix name

PropertyFilter: Attribute Filtering

Propertyincludeexpressions: properties include expressions
To see how to use the instance code

     Private classExcludeuserpropertiesatparameter:defaultpropertybindingpredicateprovider<user>{Func<modelbindingcontext,string,BOOL> _defaultfilter1 =(context, PropertyName)=false;  PublicExcludeuserpropertiesatparameter () {} Public Override stringPrefix {Get                {                    return "User"; }            }                        Public OverrideIenumerable<expression<func<user,Object>>>propertyincludeexpressions {Get                {                                    yield returnm =M.registerationmonth; yield returnm =M.username; }            }        }

Controller

   Public class Bindattributecontroller:controller    {        public User echouser ([Bind (typeof(excludeuserpropertiesatparameter))] User User)        {            return  user;        }

User entity

  Public classUser {[Required] Public intId {Get;Set; }  Public intKey {Get;Set; } [Required] Public stringRegisterationmonth {Get;Set; }  Public stringUserName {Get;Set; }  PublicAddress Address {Get;Set; } }

The Prefix prefix name is user, which means that the request ID must be prefixed with the user

Propertyincludeexpressions: attributes include:

Get

{yield return m = m.registerationmonth; yield return m = = m.username;} 

Representation: This property of the detachment is assigned a value.

Let's look at the PropertyFilter effect.

   Private classExcludeuserpropertiesatparameter:defaultpropertybindingpredicateprovider<user>{Func<modelbindingcontext,string,BOOL> _defaultfilter1 =(context, PropertyName)=false;  PublicExcludeuserpropertiesatparameter () {} Public Override stringPrefix {Get                {                    return "User"; }            }             Public OverrideFunc<modelbindingcontext,string,BOOL>PropertyFilter {Get                    {                    return_defaultfilter1; }                }      }

_defaultfilter1 expression always returns false

All are not assigned,

PropertyFilter:

Propertyincludeexpressions equals null PropertyFilter will return true by default.

Fromqueryattribute

Fromrouteattribute
Fromformattribute

ASP. Vnext modelbinding