Using multiple connection strings with entity framework

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Hi,
I have a data class library that contains multiple edmx files.

Each edmx file references a different database therefore; I have multiple connection strings. How do I get my context to use the appropriate connection string. E.g.: When I make a call to the second edmx model.

I get an error presumably, because the incorrect connection string was chosen. I found the "EntityConnectionStringBuilder" but, not sure how to apply it.

Any suggestions.

Posted 3-Dec-13 5:02am

Herrwolf1

Updated 3-Dec-13 5:05am

RaisKazi

v2

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Dave Kreskowiak · Answer 1 · 2013-12-03T05:58:00

Solution 1

I believe you would just give it the name of the connection string in your app/web.config file.

using (var context = new MyDbContext("connectionStringName"))
{
    ....
}

Posted 3-Dec-13 5:58am

Dave Kreskowiak

Maciej Los · Answer 2 · 2013-12-03T06:02:00

If i'm not wrong, you can set mulitiple connection strings in a config file. Have a look here: Entity Framework - Config File Settings[^] and here: Entity Framework - Connections and Models[^]

Example:

HTML

<connectionstrings>
  <add name="BlogContext">
        providerName="System.Data.SqlClient" 
        connectionString="Server=.\SQLEXPRESS;Database=Blogging;Integrated Security=True;"/>
  <!-- here add another connection string -->
</add></connectionstrings>

How to use it? Creating new ObjectContext[] initializes a new instance of the ObjectContext class with the given connection string and default entity container name.

Similar subjects:
How to: Read Connection Strings from the Web.config File[]
Connection Strings and Configuration Files[]

Mike786 · Answer 3 · 2015-09-10T04:09:00

Solution 3

You can see the solution here:
http://stackoverflow.com/questions/15092290/entity-framework-using-the-same-dbcontext-with-different-connection-strings[^]

Posted 10-Sep-15 4:09am

Mike786