ASP.NET Core EF Add-Migration 命令不起作用
[英]ASP.NET Core EF Add-Migration command not working
问题描述
Following this Microsoft Tutorial when I run the PM> Add-Migration MyFirstMigration command in VS2015 project created from the same tutorial I get the following error that I can't resolve:
当我在从同一教程创建的 VS2015 项目中运行PM> Add-Migration MyFirstMigration命令时，按照此Microsoft 教程，我收到以下无法解决的错误：
More than one DbContext was found.
Use the '-Context' parameter for PowerShell commands and the '--context' parameter for dotnet commands.
Point to note注意事项
- I'm using the above tutorial with the exception that I'm using
Individual User Accountauthentication instead ofNo Authenticationused in the tutorial.我正在使用上述教程，但我使用的是Individual User Account身份验证而不是教程中使用的No Authentication。 - I've latest release of
ASP.NeT Core 1.0 and VS2015-Update 3 on windows 8.1我ASP.NeT Core 1.0 and VS2015-Update 3 on windows 8.1有最新版本的ASP.NeT Core 1.0 and VS2015-Update 3 on windows 8.1 - This is a freshly created project.这是一个新创建的项目。 No other DbContext was manually installed没有手动安装其他 DbContext
7 个解决方案
解决方案1
76 已采纳 2016-07-02 17:31:49
Running the following command (obtained from this article ) and a response from @Maverik (from StackOverflow here ) and a suggestion from @doctor above helped me resolved the issue.运行以下命令（从本文中获得）和@Maverik（来自此处的StackOverflow）的响应以及上面@doctor 的建议帮助我解决了这个问题。 Thank you all for your help:谢谢大家的帮助：
PM> Add-Migration MyFirstMigration -Context BloggingContext
解决方案2
17 2018-01-31 11:06:32
The error clearly explains to mention --context with db Context name if more than one DbContext.如果有多个 DbContext，该错误清楚地解释了要提及 --context 和 db Context 名称。 So try by mentioning your DbContext name.因此，请尝试提及您的 DbContext 名称。
dotnet ef migrations add Initial --context SampleDbContext
Hope this helps.希望这会有所帮助。
解决方案3
14 2020-01-29 11:28:23
If you need only update a identity schema existent, try it:如果您只需要更新现有的身份架构，请尝试：
update-database -Context ApplicationDbContext
ApplicationDbContext = your identity context ApplicationDbContext = 您的身份上下文
解决方案4
4 2016-07-02 17:34:22
that because you have two DbContext in your solution.那是因为您的解决方案中有两个 DbContext。 First is default created when you creating project(ApplicationDbContext) and second your EF DbContext.第一个是创建项目（ApplicationDbContext）时默认创建的，第二个是 EF DbContext。 Solution is described in error message just specify your EF DbContext错误消息中描述了解决方案，只需指定您的 EF DbContext
解决方案5
2 2020-04-07 08:06:58
Add-Migration MyFirstMigration -Context DbContextName
它在我的项目中有效。
解决方案6
1 2021-03-04 07:08:01
Use below to commands:使用下面的命令：
PM> Add-Migration MyFirstMigration -Context YourDbContext
PM> update-database -Context YourDbContext
解决方案7
0 2020-02-19 10:52:10
Following this Microsoft Tutorial when I run the PM> Add-Migration MyFirstMigration command in VS2015 project created from the same tutorial I get the following error that I can't resolve:当我在从同一教程创建的VS2015项目中运行PM> Add-Migration MyFirstMigration命令时，遵循此Microsoft教程，我得到以下无法解决的错误：
More than one DbContext was found.
Use the '-Context' parameter for PowerShell commands and the '--context' parameter for dotnet commands.
Point to note注意事项
- I'm using the above tutorial with the exception that I'm using
Individual User Accountauthentication instead ofNo Authenticationused in the tutorial.我使用上面的教程，但我使用的是Individual User Account身份验证，而不是本教程中使用的“No Authentication”。 - I've latest release of
ASP.NeT Core 1.0 and VS2015-Update 3 on windows 8.1我已经ASP.NeT Core 1.0 and VS2015-Update 3 on windows 8.1发布了ASP.NeT Core 1.0 and VS2015-Update 3 on windows 8.1最新版本 - This is a freshly created project.这是一个新创建的项目。 No other DbContext was manually installed没有其他手动安装的DbContext
解决方案8
0 2021-11-22 14:50:37
[--context] [ - 语境]
The DbContext class to use.
Add-Migration MyMigration -context DataContextName
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