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EF provides another way to solve this problem by creating a separate configuration class for each entity class. These configuration partner classes are then called in the OnModelCreating method.

Create a Product entity class:

Using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data.Entity.ModelConfiguration;namespace EF configuration partner .Model {public class Product {public int ProductNo {get; set;} public string ProductName {get; set;} public double ProductPrice {get; set;}}

Create the configuration class of the Product entity class: ProductMap. The configuration class needs to inherit from the EntityTypeConfiguration generic class. EntityTypeConfiguration is located under the System.Data.Entity.ModelConfiguration namespace, and the ProductMap class is as follows:

Using EF configuration partner .Model; using System;using System.Collections.Generic;using System.Data.Entity.ModelConfiguration;using System.Linq;using System.Text;namespace EF configuration partner .EDM {public class ProductMap: EntityTypeConfiguration {public ProductMap () {/ / sets the generated table name ToTable ("ProductConfiguration") / / set the primary key this.HasKey (p = > p.ProductNo) of the generated table; / / modify the generated column name this.Property (p = > p.ProductNo) .HasColumnName ("Id"); this.Property (p = > p.ProductName) .IsRequired () / / set the ProductName column is required. HasColumnName ("Name") / / Map ProductName to the Name column of the data table}

Called in the OnModelCreating () method of the data context Context class:

Using EF configuration partner .EDM; using EF configuration partner .Model; using System;using System.Collections.Generic;using System.Data.Entity;using System.Linq;using System.Text;namespace EF configuration partner .EFContext {public class Context:DbContext {public Context (): base ("DbConnection") {} public DbSet Products {get; set } protected override void OnModelCreating (DbModelBuilder modelBuilder) {/ / add the configuration class modelBuilder.Configurations.Add (new ProductMap ()) of the Product class; base.OnModelCreating (modelBuilder);}

Looking at the database, you can see that the changes match us:

This method of writing is almost the same as using modelBuilder, except that this method is better organized to deal with multiple entities. You can see that the above syntax is the same as chain programming for writing jQuery, which is called Fluent API.

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