public InitializeLiveAggregateFrame(Type aggregateType, Type idType, CallCreateAggregateFrame create) : base(true)
{
_aggregateType = aggregateType;
_idType = idType;
_create = create;
_create.FirstEventExpression = "stream.Events.First()";
Aggregate = new Variable(aggregateType, this);
var load = typeof(IQuerySession)
.GetMethods()
.Single(x => x.Name == "LoadAsync" && x.GetParameters().First().ParameterType == idType)
.MakeGenericMethod(aggregateType);
_loadMethod = new MethodCall(typeof(IDocumentSession), load);
_loadMethod.AssignResultTo(Aggregate);
}