How to Get Tracked Entities

Tracking stored entities:

using (var session = store.OpenSession())
{
    // Store entities within the session:
    Employee employee1 = new Employee {FirstName = "John", LastName = "Doe"};
    Employee employee2 = new Employee {FirstName = "David", LastName = "Brown"};
    Employee employee3 = new Employee {FirstName = "Tom", LastName = "Miller"};
    session.Store(employee1, "employees/1-A");
    session.Store(employee2, "employees/2-A");
    session.Store(employee3, "employees/3-A");

    // Get tracked entities:
    IDictionary<string, EntityInfo> trackedEntities = session.Advanced.GetTrackedEntities();

    // The session tracks the 3 new stored entities:
    Assert.Equal(3, trackedEntities.Keys.Count);
    var entityInfo = trackedEntities["employees/1-A"];
    Assert.Equal("employees/1-A", entityInfo.Id);
    Assert.True(entityInfo.Entity is Employee);
    
    // Save changes:
    session.SaveChanges();
    
    // The session keeps tracking the entities even after SaveChanges is called:
    trackedEntities = session.Advanced.GetTrackedEntities();
    Assert.Equal(3, trackedEntities.Keys.Count);
}

Tracking loaded and deleted entities:

using (var session = store.OpenSession())
{
    // Load entity:
    Employee employee1 = session.Load<Employee>("employees/1-A");
    
    // Delete entity:
    session.Delete("employees/3-A");
    
    // Get tracked entities:
    IDictionary<string, EntityInfo> trackedEntities = session.Advanced.GetTrackedEntities();
    
    // The session tracks the 2 entities:
    Assert.Equal(2, trackedEntities.Keys.Count);
    
    // Note the 'IsDeleted' property that is set for deleted entities:
    var entityInfo = trackedEntities["employees/3-A"];
    Assert.True(entityInfo.IsDeleted);
    
    // Save changes:
    session.SaveChanges();
}

Tracking queried entities:

using (var session = store.OpenSession())
{
    // Query for all employees:
    var employees = session.Query<Employee>().ToList();
    
    // Get tracked entities:
    IDictionary<string, EntityInfo> trackedEntities = session.Advanced.GetTrackedEntities();
    
    // The session tracks the entities loaded via the query:
    Assert.Equal(2, trackedEntities.Keys.Count); 
}

IDictionary<string, EntityInfo> GetTrackedEntities();

public class EntityInfo
{
    public string Id { get; set; }
    public object Entity { get; set; }
    public bool IsDeleted { get; set; }
}