VS工具->Nuget包管理器->程序包管理控制台
执行以下命名：
PM> enable-migrations
More than one context type was found in the assembly 'DataMigration'.
To enable migrations for 'DataMigration.PrivateDb', use Enable-Migrations -ContextTypeName DataMigration.PrivateDb.
To enable migrations for 'DataMigration.PublicDb', use Enable-Migrations -ContextTypeName DataMigration.PublicDb.
To enable migrations for 'DataMigration.RKEDb', use Enable-Migrations -ContextTypeName DataMigration.RKEDb.
PM> enable-migrations -ContextTypeName DataMigration.PrivateDb
Checking if the context targets an existing database...
Code First Migrations enabled for project DataMigration.
PM> Add-Migration InitialCreate
Scaffolding migration 'InitialCreate'.
The Designer Code for this migration file includes a snapshot of your current Code First model. This snapshot is used to calculate the changes to your model when you scaffold the next migration. If you make additional changes to your model that you want to include in this migration, then you can re-scaffold it by running 'Add-Migration InitialCreate' again.
PM> Update-Database -Verbose
Using StartUp project 'DataMigration'.
Using NuGet project 'DataMigration'.
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
Target database is: 'TC_Private' (DataSource: ., Provider: System.Data.SqlClient, Origin: Configuration).
Applying explicit migrations: [201906180146102_InitialCreate].
Applying explicit migration: 201906180146102_InitialCreate.
CREATE TABLE [dbo].[T_MT_Community] (
[Id] [nvarchar](128) NOT NULL,
[MigrationTime] [datetime] NOT NULL,
CONSTRAINT [PK_dbo.T_MT_Community] PRIMARY KEY ([Id])
)
INSERT [dbo].[__MigrationHistory]([MigrationId], [ContextKey], [Model], [ProductVersion])
VALUES (.............................)
Running Seed method.