Entity is updated in. Net 3.5, and the method for deleting data is extended.

The addtoxxxx () method is automatically generated when an entity is generated when an object is added. Therefore, this extension does not include the method for adding an object;
 

 
Demo
 

 
Public static class test
 

 
{
 

 
Public static void updatecustomer ()
 

 
{
 

 
Crmentityprovider crmep = newCrmentityprovider ();
 

 
// Here, the customer instance is usually deserialized in JSON/XML.
 

Customer customer =NewCustomer () {pk_customer = 123, name = "ABC "};
 

 
Crmep. updateentity (customer );
 

 
}
 

 
}
 

 Public class  Crmentityprovider { Private  Type _ Contexttype; Public Crmentityprovider () {_ contexttype = Typeof ( Crmentities );}Public bool Updateentity <t> (T entity) Where T: system. Data. Objects. dataclasses. Entityobject {_ Contexttype. updateentity (entity ); Return true ;} Public bool Deleteentity <t> (T entity) Where T: system. Data. Objects. dataclasses. Entityobject {_ Contexttype. deleteentity (entity ); Return true ;}}

 

 

 

The following is an extension method class.

 Public static class  Objectcontextextension { /// <Summary> /// Add the entity to objectcontext    /// </Summary> /// <typeparam name = "tentity"> </typeparam> /// <Param name = "entity"> </param> /// <Param name = "context"> </param>  Private Static void Attachentity <tentity> (tentity entity, Objectcontext Context) Where Tentity:Entityobject { VaR Entitysetname = ( From P In Context. GetType (). getproperties () Where P. propertytype. fullname. Contains ( Typeof (Tentity). fullname) Select P). First (). Name; If (Entitysetname = Null ) Throw new  Notsupportedexception ("Context has not an entity ." ); String Entityfullname = context. defaultcontainername + "." + Entitysetname; context. attachto (entitysetname, entity );} /// <Summary> ///  Update only if the attribute value of entity is not null.  /// </Summary> /// <typeparam name = "tentity"> </typeparam> /// <Param name = "contexttype"> </param> /// <Param name = "entity"> </param>  Public static void Updateentity <tentity> ( This  Type Contexttype, tentity entity) Where Tentity: Entityobject { If (! Typeof ( Objectcontext ). Isassignablefrom (contexttype )) Throw new  Notsupportedexception ( "Contexttype is not an objectcontext ." ); Using ( Objectcontext Context = Activator . Createinstance (contexttype)As  Objectcontext ) {Attachentity <tentity> (entity, context ); VaR Propertys = From P In typeof (Tentity). getproperties (system. reflection. Bindingflags . Instance | system. reflection. Bindingflags . Public) Where P. getgetmethod ( False )! = Null & P. getvalue (entity, Null )! = Null let Attribute = ( Edmscalarpropertyattribute ) Attribute . Getcustomattribute (p, Typeof ( Edmscalarpropertyattribute )) Where Attribute! = Null &&! Attribute. entitykeyproperty Select P. Name; system. Data. Objects. Objectstateentry Se = context. objectstatemanager. getobjectstateentry (entity );Foreach ( VaR Item In Propertys) {se. setmodifiedproperty (item);} context. savechanges ();}} /// <Summary> ///  Delete  /// </Summary> /// <typeparam name = "tentity"> </typeparam> /// <Param name = "contexttype"> </param> /// <Param name = "entity"> </param>  Public static void Deleteentity <tentity> ( This  Type Contexttype, tentity entity)Where Tentity: Entityobject { If (! Typeof ( Objectcontext ). Isassignablefrom (contexttype )) Throw new  Notsupportedexception ( "Contexttype is not an objectcontext ." ); Using ( Objectcontext Context = Activator . Createinstance (contexttype) As Objectcontext ) {Attachentity <tentity> (entity, context); context. deleteobject (entity); context. savechanges ();}}