# ModelBuilders - BuilderManagers

In the previous examples ModelBuilders were registered directly in the CustomizeTypesInfo method. As the number of ModelBuilders in an XAF module grows this has the potential to become a serious maintenace issue. To avoid this potential problem Xenial.Framework provides BuilderManagers.

# XafBuilderManager

To utilse BuilderManagers create a new class (by convention name it BuilderManager) and derive it from the XafBuilderManager class. Within the class override the GetBuilders method to create an instance of the DemoTaskModelBuilder.



















 
 
 
 



using System;
using System.Collections.Generic;
using System.Text;

using DevExpress.ExpressApp.DC;

using Xenial.Framework.ModelBuilders;

namespace MainDemo.Module.BusinessObjects
{
    public class MainDemoBuilderManager : XafBuilderManager
    {
        public MainDemoBuilderManager(ITypesInfo typesInfo)
            : base(typesInfo) { }

        public MainDemoBuilderManager(ITypesInfo typesInfo, IEnumerable<IBuilder> builders)
            : base(typesInfo, builders) { }

        protected override IEnumerable<IBuilder> GetBuilders() => new IBuilder[]
        {
            TypesInfo.CreateModelBuilder<DemoTaskModelBuilder>()
        };
    }
}
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# Registration

With that done register the DemoTaskModelBuilderManager in the CustomizeTypesInfo method and call Build.





















 
 




using System;
using System.Collections.Generic;
using System.Linq;

using DevExpress.ExpressApp;
using DevExpress.ExpressApp.DC;

using Xenial.Framework;
using Xenial.Framework.ModelBuilders;

using MainDemo.Module.BusinessObjects;

namespace MyApplication.Module
{
    public class MyApplicationModule : ModuleBase
    {
        public override void CustomizeTypesInfo(ITypesInfo typesInfo)
        {
            base.CustomizeTypesInfo(typesInfo);

            new MainDemoBuilderManager(typesInfo)
                .Build();
        }
    }
}
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# Summary

BuilderManagers are simple to use and the recommended way of working with ModelBuilders.

TIP

BuilderManagers have built-in optimizations to minimize any performance overhead.