CRM 2015 Filtering Sample

entity-filtering-service.cs

public class EntityFilteringService : ICodeWriterFilterService
{
  private readonly IFilterItemCollection _collection;

  public EntityFilteringService(ICodeWriterFilterService defaultService)
  {
    this.DefaultService = defaultService;

    this._collection = FilterItemCollection.CreateInstance();
  }

  ...
  
  public bool GenerateEntity(EntityMetadata entityMetadata, IServiceProvider services)
  {
    var isValidEntity = this.IsValidEntity(entityMetadata.LogicalName);
    return isValidEntity && this.DefaultService.GenerateEntity(entityMetadata, services);
  }
  
  ...

  private bool IsValidEntity(string entityName)
  {
    var isValidEntity = this._collection.IsValidEntity(entityName);
    return isValidEntity;
  }
}