EntityFramework 启用迁移 Enable-Migrations 报异常 "No context type was found in the assembly"
2013-04-18 14:16
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以前做项目的时候,没有采用分类库的形式,所以迁移一致非常顺利,没有出现过任何状况。
这次做项目稍微有点大,必须要分类库才方便开发维护。
在解决方案中启用项目EntityFramework迁移时却发生了异常。
异常说在我的项目中没有找到DBContext类。
这个DBContext类确实没有放在启动项目下面,是另外建立了一个独立的类库来存放。
在启动项目中引用了却无法找到。。。
查看get-help Enable-Migrations帮助,发现启用迁移命令带了几个参数。
Enable-Migrations [-ContextTypeName <String>] [-EnableAutomaticMigrations] [-ProjectName <String>] [-StartUpProjectName <String>] [-ConnectionStringName <String>] [-Force] [<CommonParameters>]
ContextTypeName:项目继承自DBContext的类名字。
EnableAutomaticMigrations:开启自动迁移。
ProjectName:存放DBContext类的项目名称。
StartUpProjectName:解决方案中启动项目的名称,作用是调用该项目下的连接字符串。
ConnectionStringName:连接字符串名称
上面五个参数是解决问题必须的,其它的无关紧要。
例如:
Enable-Migrations -ContextTypeName "DBAccessLib.TJSSDBContext" -ProjectName "DBAccessLib" -StartUpProjectName "WebSite" -ConnectionStringName "TJSSDBContext" -Verbose
依次填好之后,问题解决。
同样的在Add-Migration、Update-Database的时候也需要填写相应的参数。否则会出现同样错误。
例如:
Add-Migration -Name "EditCST_DevicePhoto" -ProjectName "DBAccessLib" -StartUpProjectName "WebSite" -ConnectionStringName "TJSSDBContext" -Verbose
Update-Database -Script -ProjectName "DBAccessLib" -StartUpProjectName "WebSite" -ConnectionStringName "TJSSDBContext" -Verbose
这次做项目稍微有点大,必须要分类库才方便开发维护。
在解决方案中启用项目EntityFramework迁移时却发生了异常。
异常说在我的项目中没有找到DBContext类。
这个DBContext类确实没有放在启动项目下面,是另外建立了一个独立的类库来存放。
在启动项目中引用了却无法找到。。。
查看get-help Enable-Migrations帮助,发现启用迁移命令带了几个参数。
Enable-Migrations [-ContextTypeName <String>] [-EnableAutomaticMigrations] [-ProjectName <String>] [-StartUpProjectName <String>] [-ConnectionStringName <String>] [-Force] [<CommonParameters>]
ContextTypeName:项目继承自DBContext的类名字。
EnableAutomaticMigrations:开启自动迁移。
ProjectName:存放DBContext类的项目名称。
StartUpProjectName:解决方案中启动项目的名称,作用是调用该项目下的连接字符串。
ConnectionStringName:连接字符串名称
上面五个参数是解决问题必须的,其它的无关紧要。
例如:
Enable-Migrations -ContextTypeName "DBAccessLib.TJSSDBContext" -ProjectName "DBAccessLib" -StartUpProjectName "WebSite" -ConnectionStringName "TJSSDBContext" -Verbose
依次填好之后,问题解决。
同样的在Add-Migration、Update-Database的时候也需要填写相应的参数。否则会出现同样错误。
例如:
Add-Migration -Name "EditCST_DevicePhoto" -ProjectName "DBAccessLib" -StartUpProjectName "WebSite" -ConnectionStringName "TJSSDBContext" -Verbose
Update-Database -Script -ProjectName "DBAccessLib" -StartUpProjectName "WebSite" -ConnectionStringName "TJSSDBContext" -Verbose
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