HelloDialogflow.cs

using System;
using Google.Cloud.Dialogflow.V2;

// To setup, follow instructions:
// https://cloud.google.com/dialogflow-enterprise/docs/quickstart-client-libraries

namespace GoogleCloudSamples
{
    public class EntityTypeManagement
    {
        public void Create(string projectId, string displayName, EntityType.Types.Kind kind = EntityType.Types.Kind.Map)
        {
            var client = EntityTypesClient.Create();

            var entityType = new EntityType();
            entityType.DisplayName = displayName;
            entityType.Kind = kind;

            var createdEntityType = client.CreateEntityType(
                parent: new ProjectAgentName(projectId),
                entityType: entityType
            );

            Console.WriteLine($"Created entity type: {createdEntityType.Name}");
        }

        public void List(string projectId)
        {
            var client = EntityTypesClient.Create();
            var response = client.ListEntityTypes(parent: new ProjectAgentName(projectId));
            
            foreach (var entityType in response)                               
            {                                                                  
                Console.WriteLine($"Entity name: {entityType.Name}");          
                Console.WriteLine($"Entity display name: {entityType.DisplayName}");
                Console.WriteLine($"Number of entities: {entityType.Entities.Count}");             
            }
        }
    }
}