Simple use of the Entity framework

The company's project in the EF, the recent time to study the next, collated a more common EF framework for everyone to share.

EF This east, use good words, really convenient development, use bad words, out of a problem half a day can not find out what is the reason.

Let's introduce the simple use of EF. Mainly divided into the following 5 items

Ef. Core: Data Entity

Ef. data:c# entities directly mapped to data tables

Ef. Service: Data Services

Efframework: public class Library

Efsolution: Test Project

DbContext is an important class for EF, and our database access objects must inherit that class. Here's the data context we're going to use:

 Public classEfobjectcontext:dbcontext, Idbcontext { PublicEfobjectcontext (stringnameorconnectionstring):Base(nameorconnectionstring) {//((Iobjectcontextadapter) this). ObjectContext.ContextOptions.LazyLoadingEnabled = true;        }        protected Override voidonmodelcreating (Dbmodelbuilder modelBuilder) {//dynamically load all configuration//System.Type configtype = typeof (Languagemap); //Any of your configuration classes here//var typestoregister = assembly.getassembly (Configtype). GetTypes ()            string[] MapPath = {"EF. Data.dll" }; foreach(varPathinchMapPath) {                varASM =Assembly.LoadFrom (path); varTypestoregister =ASM. GetTypes (). Where (Type= =!string.isnullorempty (type. Namespace)). Where (Type= = Type. BaseType! =NULL&& type. Basetype.isgenerictype && type. Basetype.getgenerictypedefinition () = =typeof(entitytypeconfiguration<>)); foreach(varTypeinchtypestoregister) {Dynamic Configurationinstance=activator.createinstance (type);                MODELBUILDER.CONFIGURATIONS.ADD (configurationinstance); }            }            //... or do it manually below. For example,//ModelBuilder.Configurations.Add (New Languagemap ());            Base.        Onmodelcreating (ModelBuilder); }}

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The Onmodelcreating method is when an application loads a map of an entity and a data table into the data context at initialization time.

1. Defining entities

     Public class bloguser:baseentity    {        publicstringgetset;}          Public int Get Set ; }          Public string Get Set ; }    }

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It's easier here, no more nonsense.

2. Define Mappings

 Public Partial class Blogusermap:entitytypeconfiguration<bloguser>    {        public  blogusermap ()        {             this. ToTable ("bloguser");             this. Haskey (c = c.id);        }    }

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Define the mapping of entities to data tables, and a pair of one or one-to-many, many-to-many relationships between entities is also defined here.

3. Define Data Service

 Public Interface Ibloguserservice    {        IList<BlogUser> getallbloguser ();    }

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 public  class   Bloguserservice:ibloguserservice { private  readonly  irepository<bloguser> _        Bloguserrepository;  public  bloguserservice (irepository<bloguser> Bloguserrepository) { this . _bloguserrepository = Bloguserrepository;  public  ilist<bloguser> Getallbloguser () { return   _blo        GUserRepository.Table.ToList (); }    }

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The test procedure is as follows:

Static void Main (string[] args)        {            enginecontext.initialize (false);            Console.WriteLine (" initialization complete ");             = Enginecontext.current.resolve<ibloguserservice>();            IList<BlogUser> users = service. Getallbloguser ();            Console.readkey ();        }

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This is the simple use of EF.

Simple use of the Entity framework