1. Using the same solution used for the previous recipe, create a new class called PacktOptionSetFiltering with the following code:

using System; 
using System.Collections.Generic; 
using System.Linq; 
using Microsoft.Crm.Services.Utility; 
using Microsoft.Xrm.Sdk.Metadata; 

namespace Packt.Xrm.CrmSvcUtilExensions 
{ 
    public sealed class PacktOptionSetFiltering : ICodeWriterFilterService 
    { 
        private ICodeWriterFilterService DefaultService { get; } 
        private Dictionary<string, bool> GeneratedOptionSets { get; } 
        public PacktOptionSetFiltering(ICodeWriterFilterService defaultService) 
        { 
            DefaultService = defaultService; 
            GeneratedOptionSets = new Dictionary<string, bool>(); 
        } 
 //Only include piclists, state, and status attributes 
        bool ICodeWriterFilterService.GenerateAttribute(AttributeMetadata attributeMetadata, IServiceProvider services) 
        { 
return (attributeMetadata.AttributeType == AttributeTypeCode.Picklist 
    || attributeMetadata.AttributeType == AttributeTypeCode.State 
    || attributeMetadata.AttributeType == AttributeTypeCode.Status); 
        } 

        bool ICodeWriterFilterService.GenerateOptionSet(OptionSetMetadataBase optionSetMetadata, 
            IServiceProvider services) 
        { 
            if (!optionSetMetadata.Name.StartsWith(GetFilter()) || GeneratedOptionSets.ContainsKey(optionSetMetadata.Name)) 
                return false; 
            if (optionSetMetadata.IsGlobal.HasValue && optionSetMetadata.IsGlobal.Value) 
                GeneratedOptionSets[optionSetMetadata.Name] = true; 
            return true; 

        }  

// Omitted code GenerateServiceContext returns false 
// GenerateRelationship returns flase 
  // GenerateEntity same as previous recipe 
     // GetFilter same as previous recipe 
  // GenerateOption default behavior 

    } 
} 

2. Create a new class called CodeCustomizationService.cs with the following piece of code:

using System; 
using System.CodeDom; 
using Microsoft.Crm.Services.Utility; 

namespace Packt.Xrm.CrmSvcUtilExensions 
{ 
    public sealed class CodeCustomizationService : ICustomizeCodeDomService 
    { 
        public void CustomizeCodeDom(CodeCompileUnit codeUnit, IServiceProvider services) 
        { 
            for (var i = 0; i < codeUnit.Namespaces.Count; ++i) 
            { 
                var types = codeUnit.Namespaces[i].Types; 
                for (var j = 0; j < types.Count;) 
                { 
                    if (!types[j].IsEnum || types[j].Members.Count == 0) 
                    { 
                        types.RemoveAt(j); 
                    } 
                    else 
                    { 
                        j += 1; 
                    } 
                } 
            } 
        } 
    } 
} 

3. Compile your code.
4. Run the CrmSvcUtil command in the binDebug folder with the following parameters:

CrmSvcUtil.exe /codewriterfilter:"Packt.Xrm.CrmSvcUtilExensions.PacktOptionSetFiltering, Packt.Xrm.CrmSvcUtilExensions" /codecustomization:"Packt.Xrm.CrmSvcUtilExensions.CodeCustomizationService, Packt.Xrm.CrmSvcUtilExensions" /connectionstring:"AuthType=Office365;[email protected]; Password=;Url=https://.crm.dynamics.com" /namespace:Packt.Xrm.Entities /out:OptionSets.cs /filter:packt_