EF中的Add-Migration中StartupProjectName参数的用途是什么 [英] What's the purpose of StartupProjectName parameter in Add-Migration in EF

问题描述

据我了解 Add-Migration 在做什么，它只是将当前代码模型与上次应用的迁移模型进行比较（resx中包含整个模型）文件）

As I understand what Add-Migration is doing, it's just compares the current model of code with the model of last applied migration (which has the entire model in its resx file)

对于StartupProjectName参数的描述是：

For the description of StartupProjectName paramter it says:

-StartUpProjectName

指定用于命名连接字符串的配置文件。
如果省略，则使用指定项目的配置文件。

Specifies the configuration file to use for named connection strings. If omitted, the specified project’s configuration file is used.

如果每个迁移都具有整个模型的快照，则存在

If each migration has a snapshot of whole model, then there would no need to have a database, since the current model and that snapshot are totally comparable.

所以为什么要在 Add-Migration 中提供此参数，所以不需要数据库>命令来指定连接字符串？

So why is this parameter provided in Add-Migration command to specify a connection string?

推荐答案

使用该参数，您可以指定包含连接字符串的项目（在应用程序中。配置例如）。

With that parameter you can specify the project which contains your connection string (in app.config e.g.).

您可以在单独的项目中进行迁移（不包含连接字符串）。

You can have your migrations in a seperate project (which doesn't contain the connection string).

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