How to Dynamically Change Entity Framework Connections at Runtime in Web APIs?

Dynamically change Entity Framework connections at runtime

In Web API projects, the ability to change data context connections based on user input is often necessary. In this case, the connection string must be dynamic and adjustable.

To build the connection string, SqlConnectionStringBuilder and EntityConnectionStringBuilder are used. SqlConnectionStringBuilder configures SQL connection parameters, while EntityConnectionStringBuilder sets Entity Framework connection details.

Modify data context connection

To change the data context connection, you can use an extension method named ChangeDatabase. This method accepts optional parameters that specify the new database details and connection string name if it is different from the base EF class name.

Inside the ChangeDatabase method, initialize EntityConnectionStringBuilder with the existing connection string. Then, create a SqlConnectionStringBuilder and populate it with the specified parameters. Finally, the modified connection string is set as the data context connection string.

Connection string persistence

In Web API projects, the connection string is usually set during user login and should persist during user interaction. For persistence, the connection string can be stored in a session variable, application-level cache, or persistence repository.

By using the ChangeDatabase extension method and implementing connection string persistence, you can dynamically change Entity Framework connections at runtime based on user selections.

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