ASP.NET Core 5.0 OData $select not working

Question

In my ASP.NET Core 5.0 REST API I am using Microsoft.AspNetCore.OData v.7.5.2 and Entity Framework v.5.0.2

I have a Controller that implements ODataController and a SearchContacts function.

[HttpGet]
[EnableQuery(PageSize = 50)]
[Route("[action]")]
public ActionResult<IQueryable<ContactModel>> SearchContacts()
{
    return this.Ok(this._context.Contacts.AsQueryable());
}

For SearchContacts I can use $filter, $top and $skip just fine. When I try to use $select I get a strange result:

[
{
    "instance": null,
    "container": {},
    "modelID": "f4ca8855-11fa-4822-8f11-dc39b3c3c3f8",
    "untypedInstance": null,
    "instanceType": null,
    "useInstanceForProperties": false
},
{
    "instance": null,
    "container": {},
    "modelID": "f4ca8855-11fa-4822-8f11-dc39b3c3c3f8",
    "untypedInstance": null,
    "instanceType": null,
    "useInstanceForProperties": false
}
]

I tried updating Microsoft.AspNetCore.OData to version 7.5.4 but then I get an error: Severity Code Description Project File Line Suppression State

Error CS1705 Assembly 'Microsoft.AspNetCore.OData' with identity 'Microsoft.AspNetCore.OData, Version=7.5.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'Microsoft.OData.Edm, Version=7.7.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' which has a higher version than referenced assembly 'Microsoft.OData.Edm' with identity 'Microsoft.OData.Edm, Version=7.7.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

Answer 1

//in program.cs add

builder.Services.AddControllers()
.AddOData(opt => opt.AddRouteComponents("odata", GetEdmModel())
.Select()
.Filter()
.OrderBy()
.SetMaxTop(null)
.Count()
.Expand()
 );


  Microsoft.OData.Edm.IEdmModel GetEdmModel()
  {
     ODataConventionModelBuilder builder = new 
     ODataConventionModelBuilder();
     builder.EntitySet<ProductEntity>("Product/GetAllQ");
     return builder.GetEdmModel();
  }