DBContent初始化 —— 关联Entity查找
一、 关联到具体的Entity
二、 通过EntityTypeConfiguration 关联到DbContent
三、 在初始化DbContent时,映射相应的Entity对象
四、 通过缓存DbContentType集合字典,查找DbContextInitializerBase
五、 查找当前DbContent的Entity ![](https://images2015.cnblogs.com/blog/638965/201604/638965-20160421135301476-1419531581.png)
六、 具体DbContent创建(自定义DbContent的实现)
需实现DbContextInitializerBase基类
筛选出当前DbContent的Entity
初始化配置
DBContent初始化 —— DBContent生成
一、 主要方法
二、 框架初始化入口
三、 DatabaseInitializer数据库初始化——配置信息
四、 DatabaseInitializer数据库初始化——生成
附一段单元测试代码
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 public class DbContentInitializeTest 2 { 3 [Fact()] 4 public void DbContentInitialize_Test() 5 { 6 using (var context = new MyDbContext()) 7 { 8 context.AddEntityRegHelper(new CustomerRegstHelper()); 9 context.AddEntityRegHelper(new CusRegstHelper()); 10 IDatabaseInitializer<MyDbContext> initializer; 11 if (!context.Database.Exists()) 12 { 13 initializer = new CreateDatabaseIfNotExists<MyDbContext>(); ; 14 } 15 else 16 { 17 initializer = new MigrateDatabaseToLatestVersion<MyDbContext, AutoMigrationsConfiguration<MyDbContext>>(); ; 18 } 19 Database.SetInitializer(initializer); 20 21 ObjectContext objectContext = ((IObjectContextAdapter)context).ObjectContext; 22 StorageMappingItemCollection mappingItemCollection = (StorageMappingItemCollection)objectContext.ObjectStateManager 23 .MetadataWorkspace.GetItemCollection(DataSpace.CSSpace); 24 mappingItemCollection.GenerateViews(new List<EdmSchemaError>()); 25 } 26 } 27 } 28 29 /// <summary> 30 /// 自动迁移配置 31 /// </summary> 32 /// <typeparam name="TContext"></typeparam> 33 public class AutoMigrationsConfiguration<TContext> : DbMigrationsConfiguration<TContext> 34 where TContext : DbContext 35 { 36 /// <summary> 37 /// 初始化一个<see cref="AutoMigrationsConfiguration{TContext}"/>类型的新实例 38 /// </summary> 39 public AutoMigrationsConfiguration() 40 { 41 AutomaticMigrationsEnabled = true; 42 AutomaticMigrationDataLossAllowed = true; 43 ContextKey = typeof(TContext).FullName; 44 } 45 } 46 47 /// <summary> 48 /// 实体注册Helper接口 49 /// </summary> 50 public interface IEntityRegstHelper 51 { 52 void RegTo(ConfigurationRegistrar confRegistrar); 53 } 54 55 // 客户 56 public class Customer 57 { 58 public int CustomerID { get; set; } 59 public String CustomerName { get; set; } 60 public string Address { get; set; } 61 } 62 // 客户实体的注册Helper 63 public class CustomerRegstHelper : IEntityRegstHelper 64 { 65 public void RegTo(ConfigurationRegistrar confRegistrar) 66 { 67 confRegistrar.Add<Customer>(new EntityTypeConfiguration<Customer>()); 68 } 69 } 70 71 public class Cus 72 { 73 public int CusID { get; set; } 74 public String CusName { get; set; } 75 public string Add { get; set; } 76 } 77 // 客户实体的注册Helper 78 public class CusRegstHelper : IEntityRegstHelper 79 { 80 public void RegTo(ConfigurationRegistrar confRegistrar) 81 { 82 confRegistrar.Add<Cus>(new EntityTypeConfiguration<Cus>()); 83 } 84 } 85 86 87 public class MyDbContext : DbContext 88 { 89 public MyDbContext() 90 : this(false) 91 { } 92 93 public MyDbContext(bool proxyCreationEnabled) 94 : base("name=RongziCmsDbContext") 95 { 96 //The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' 97 //for the 'System.Data.SqlClient' ADO.NET provider could not be loaded. 98 //Make sure the provider assembly is available to the running application. 99 //See http://go.microsoft.com/fwlink/?LinkId=260882 for more information. 100 var _ = System.Data.Entity.SqlServer.SqlProviderServices.Instance; 101 this.Configuration.ProxyCreationEnabled = proxyCreationEnabled; 102 } 103 104 List<IEntityRegstHelper> entityRegstHelperlist; 105 // 添加实体注册 106 public void AddEntityRegHelper(IEntityRegstHelper r) 107 { 108 if (entityRegstHelperlist == null) 109 entityRegstHelperlist = new List<IEntityRegstHelper>(); 110 entityRegstHelperlist.Add(r); 111 } 112 113 //public DbSet<Customer> Customers { get; set; } 114 protected override void OnModelCreating(DbModelBuilder modelBuilder) 115 { 116 // 动态地加入实体 117 if (entityRegstHelperlist != null) 118 { 119 foreach (IEntityRegstHelper r in entityRegstHelperlist) 120 r.RegTo(modelBuilder.Configurations); 121 } 122 } 123 }