public class ModelConfiguration : DbConfiguration

     {

         public ModelConfiguration()

         {

             var conn = System.Configuration.ConfigurationManager.ConnectionStrings[ConnectionConst.DefaultConnectionKey];

             var connProvder = conn.ProviderName;

             this.SetHistoryContext(connProvder, (connection, defaultSchema) => new MigrationContext(connection, defaultSchema));

         }

     }

  /// <summary>

     /// 迁移表

     /// </summary>

     public class MigrationContext : HistoryContext

     {

         public MigrationContext(DbConnection dbConnection, string defaultSchema)

             : base(dbConnection, defaultSchema)

         {

         }

         protected override void OnModelCreating(DbModelBuilder modelBuilder)

         {

             base.OnModelCreating(modelBuilder);

             modelBuilder.Entity<HistoryRow>().ToTable(tableName: "MigrationHistory");

         }

     }

   public class ConnectionConst

     {

         /// <summary>

         /// 数据库连接默认字符串

         /// </summary>

         public const string DefaultConnectionKey = "DefaultConnection";

     }