I have created a .net 8 isolated function app as a POC for using durable entities containing a single entity. Also created 2 endpoints, one to retrieve the entity value, the other to act on the entity. When retrieving the value of the entity it is always null. I have left the app running overnight to see if it is a timing issue and the value is still returned as null. I have tried this both running on Azureite as well a storage account in Azure.

The entity function is recognized by the framework but a breakpoint inside the function is never hit.

The code below is scraped directly from the MS documentation on Durable Entities. here

Entity Definition:

 public class Counter : TaskEntity<int>
 {
     readonly ILogger logger;

     public Counter(ILogger<Counter> logger)
     {
         this.logger = logger;
     }

     public void Add(int amount)
     {
         this.State += amount;
     }

     public Task Reset()
     {
         this.State = 0;
         return Task.CompletedTask;
     }

     public Task<int> Get()
     {
         return Task.FromResult(this.State);
     }

     // Delete is implicitly defined when defining an entity this way

     [Function(nameof(Counter))]
     public static Task Run([EntityTrigger] TaskEntityDispatcher dispatcher)
         => dispatcher.DispatchAsync<Counter>();
 }

Function Definitions:

 [Function("GetCounter")]
 public static async Task<HttpResponseData> GetCounter(
     [HttpTrigger(AuthorizationLevel.Function, "get", Route = "Counter/{entityKey}")] HttpRequestData req,
     [DurableClient] DurableTaskClient client, string entityKey)
 {
     var entityId = new EntityInstanceId("Counter", entityKey);
     EntityMetadata<int>? entity = await client.Entities.GetEntityAsync<int>(entityId);
     HttpResponseData response = req.CreateResponse(HttpStatusCode.OK);
     await response.WriteAsJsonAsync(entity?.State);

     return response;
 }


 [Function("AddCounter")]
 public static async Task<HttpResponseData> AddCounter(
     [HttpTrigger(AuthorizationLevel.Function, "get", Route = "Counter/{entityKey}/add")] HttpRequestData req,
     [DurableClient] DurableTaskClient client, string entityKey)
 {
     var entityId = new EntityInstanceId("Counter", entityKey);
     await client.Entities.SignalEntityAsync(entityId, "add", 1);
     
     HttpResponseData response = req.CreateResponse(HttpStatusCode.OK);
     

     return response;
 }