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    <p>Here's the approach I eventually used, using the custom <code>IDatabaseInitializer&lt;T&gt;</code> code from <a href="https://stackoverflow.com/a/16163466/43140">this answer</a>, which helped me out a great deal.</p> <p>First we add another constructor to the <code>DataStore</code> class (<code>DbContext</code>) which doesn't require the connection string parameter:</p> <pre><code>public class DataStore : DbContext, IDataStore { public int UserID { get; private set; } // This is the constructor that will be called by the factory class // if it is initialised without a connection string parameter public DataStore(int userId) { UserID = userId; } public DataStore(int userId, string connectionString) : base(connectionString) { UserID = userId; } public virtual IDbSet&lt;User&gt; Users { get; set; } // Rest of code here } </code></pre> <p>Then we do the same for the factory class:</p> <pre><code>public class DataStoreFactory : Disposable, IDataStoreFactory { private DataStore _database; private int _userId; private string _connectionString; // This is the constructor that will be called by the // MigrationDataStoreFactory class public DataStoreFactory(int userId) { _userId = userId; } public DataStoreFactory(int userId, string connectionString) { _userId = userId; _connectionString = connectionString; } public IDataStore Get() { // If we have a connection string, construct our context with it, // if not, use the new constructor if(_connectionString != null) _database = new DataStore(_userId, _dateTimeServices, _connectionString); else _database = new DataStore(_userId, _dateTimeServices); return _database; } protected override void DisposeCore() { if (_database != null) _database.Dispose(); } } </code></pre> <p>This is the custom initializer code:</p> <pre><code>public class MigrateDatabaseToLatestVersionWithConnectionString&lt;TContext, TMigrationsConfiguration&gt; : IDatabaseInitializer&lt;TContext&gt; where TContext : DbContext where TMigrationsConfiguration : DbMigrationsConfiguration&lt;TContext&gt;, new() { private readonly DbMigrationsConfiguration _config; public MigrateDatabaseToLatestVersionWithConnectionString() { _config = new TMigrationsConfiguration(); } public MigrateDatabaseToLatestVersionWithConnectionString(string connectionString) { // Set the TargetDatabase for migrations to use the supplied connection string _config = new TMigrationsConfiguration { TargetDatabase = new DbConnectionInfo(connectionString, "System.Data.SqlClient") }; } public void InitializeDatabase(TContext context) { // Update the migrator with the config containing the right connection string DbMigrator dbMigrator = new DbMigrator(_config); dbMigrator.Update(); } } </code></pre> <p>Our custom context factory (which is only ever called by Code First Migrations) can now carry on using the <code>DataStore</code> constructor which <em>doesn't</em> require a connection string:</p> <pre><code>public class MigrationDataStoreFactory : IDbContextFactory&lt;DataStore&gt; { public DataStore Create() { return new DataStore(0); } } </code></pre> <p>As long as we set the database initializer to our custom initializer and pass in the connection string (which in my case is done in <code>Global.asax</code>), migrations will use the correct connection:</p> <pre><code>Database.SetInitializer&lt;DataStore&gt;(new MigrateDatabaseToLatestVersionWithConnectionString&lt;DataStore, MyMigrationsConfiguration&gt;(INJECTED_CONNECTION_STRING_HERE)); </code></pre> <p>Hope all that makes sense—feel free to ask for clarification in the comments. </p>
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    1. POHow do I inject a connection string into an instance of IDbContextFactory<T>?
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    1. POHow do I inject a connection string into an instance of IDbContextFactory<T>?
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