Event stores

By default EventFlow uses a in-memory event store. But EventFlow provides support for alternatives.



In-memory event store shouldn’t be used for production environments, only for tests.

Using the in-memory event store is easy as its enabled by default, no need to do anything.

MSSQL event store

See MSSQL setup for details on how to get started using Microsoft SQL Server in EventFlow.

Configure EventFlow to use MSSQL as event store, simply add the UseMssqlEventStore() as shown here.

IRootResolver rootResolver = EventFlowOptions.New

Create and migrate required MSSQL databases

Before you can use the MSSQL event store, the required database and tables must be created. The database specified in your MSSQL connection will not be automatically created, you have to do this yourself.

To make EventFlow create the required tables, execute the following code.

var msSqlDatabaseMigrator = rootResolver.Resolve<IMsSqlDatabaseMigrator>();

You should do this either on application start or preferably upon application install or update, e.g., when the web site is installed.


If you utilize user permission in your application, then you need to grant the event writer access to the user defined table type eventdatamodel_list_type. EventFlow uses this type to pass entire batches of events to the database.



Files event shouldn’t be used for production environments, only for tests.

The file based event store is useful if you have a set of events that represents a certain scenario and would like to create a test that verifies that the domain handles it correctly.

To use the file based event store, simply invoke .UseFilesEventStore`("...") with the path containing the files.

var storePath = @"c:\eventstore"
var rootResolver = EventFlowOptions.New