• ecf.workflow.config is no longer used since Commerce 9.
• You must make your IConfigurableModule to depend on EPiServer.Commerce.Initialization.InitializationModule to make sure that your registration happens after the default implementation.

My initialization module is declared as: 

[InitializableModule]
[ModuleDependency(typeof(EPiServer.Commerce.Initialization.InitializationModule))]
public class InitializationModule : IConfigurableModule

{

and I use the ConfigureContainer like :

public void ConfigureContainer(ServiceConfigurationContext context)
{
   context.StructureMap().Configure(c =>
  {
     c.For<ITaxCalculator>().Use<MyTaxCalculator>();

In a block controller, if I add ITaxCalculator to a constructor, I get my object(MyTaxCalculator).

In our code, we still call CartHelper.RunWorkflow(OrderGroupWorkflowManager.CartPrepareWorkflowName);

I know cart helper has been replaced and will soon be obsolete, but we can't do the change now.

Is it because I don't use yet the IOrderRepository that the calculators don't works?

Hmm, it might be a bug here. I'm not sure - I have to check and will get back to you. 

Any news?

I asked a developer who has more experience in this area than me (he actually worked in this change in Commerce 12), still waiting for his response) 

Hi Yan,

In calculators, we are cache the tax value of order group, shipment and line item. So, if it cached, it will not call to the tax calculator anymore.

Please check the value of flag like:

IOrderGroupCalculatedAmount.IsTaxTotalUpToDate

IShipmentCalculatedAmount.IsShippingTaxUpToDate or 

ILineItemCalculatedAmount.IsSalesTaxUpToDate

/Tuan

Where can I check these flags? Like I said earlier, we still use carthelper and we call the default workflows (like CartPrepare, CartValidate and CartCheckout).

I did another test, this time by using the OrderGroupCalculator.

I've added breakpoints in each functions and they never get called:

public class TestCalculator : DefaultOrderGroupCalculator
{
public TestCalculator(IOrderFormCalculator orderFormCalculator)
: base(orderFormCalculator)
{ }

protected override Money CalculateTotal(IOrderGroup orderGroup)
{
var test = orderGroup.Name;
return base.CalculateTotal(orderGroup);
}

protected override void ValidateTotal(Money money)
{
var test = money.Amount;
base.ValidateTotal(money);
}

protected override Money CalculateSubTotal(IOrderGroup orderGroup)
{
var test = orderGroup.Name;
return base.CalculateSubTotal(orderGroup);
}

protected override void ValidateSubTotal(Money money)
{
var test = money.Amount;
base.ValidateSubTotal(money);
}

protected override Money CalculateHandlingTotal(IOrderGroup orderGroup)
{
var test = orderGroup.Name;
return base.CalculateHandlingTotal(orderGroup);
}

protected override void ValidateHandlingTotal(Money money)
{
var test = money.Amount;
base.ValidateHandlingTotal(money);
}

protected override Money CalculateShippingSubTotal(IOrderGroup orderGroup)
{
var test = orderGroup.Name;
return base.CalculateShippingSubTotal(orderGroup);
}

protected override void ValidateShippingSubTotal(Money money)
{
var test = money.Amount;
ValidateShippingSubTotal(money);
}

protected override void ValidateTaxTotal(Money money)
{
var test = money.Amount;
base.ValidateTaxTotal(money);
}

protected override Money CalculateTaxTotal(IOrderGroup orderGroup)
{
var test = orderGroup.Name;
return base.CalculateTaxTotal(orderGroup);
}

Here's how I registered my class:

[InitializableModule]
[ModuleDependency(typeof(EPiServer.Commerce.Initialization.InitializationModule))]
public class InitializationModule : IConfigurableModule
{
...
public void ConfigureContainer(ServiceConfigurationContext context)
{
context.StructureMap().Configure(c =>
{
c.For<IOrderGroupCalculator>().Singleton().Use<TestCalculator>();

Ok, i've found out why my calculators were never called, it was because of this specific line in ecf.app.config:

<add feature="WorkflowsVNext" state="Disabled" type="Mediachase.Commerce.Core.Features.WorkflowsVNext, Mediachase.Commerce"/>

I just commented this line and it now works