ODP.NET

Hello everyone,

I am converting some programs (WebApi) to dontnet core 3.1, Oracle 12 and Oracle.EntityFrameworkCore version 5.21.1.
I'm having trouble handling null datetime.
In the program excerpt below I tried the ways in italics but the result was always the same, that is, the bold line causes an exception:

  UsuarioDbContext ctx = new UsuarioDbContext(Globais.GetConnStr());  
        DateTime data = DateTime.Now.Date;  
        try  
        {  
            var query = (from jaf in ctx.jafs  
                         where jaf.JAF\_DTINICIO.Date \<= data   
                         select new  
                         {  
                             inicio = jaf.JAF\_DTINICIO.ToString("dd/MM/yyyy"),  
                             _//fim = jaf.JAF\_DTFIM.ToString("dd/MM/yyyy" ),_  
                             _//fim = (jaf.JAF\_DTFIM.Equals(DBNull.Value) ? new DateTime(1900, 01, 01) : jaf.JAF\_DTFIM),_  
                             _fim = (jaf.JAF\_DTFIM == null ? new DateTime(1900, 01, 01) : jaf.JAF\_DTFIM),_  
                             unidade = jaf.UNI\_IDUNIDADE  
                         }  
            );  
            string sqlstr = query.ToQueryString();  
            **var lst = await query.ToListAsync();**  
            return await query.ToArrayAsync();  
        }  
        catch (System.Exception exc)  

The exception trace is:

Exception has occurred: CLR/System.InvalidOperationException

Exceção gerada: 'System.InvalidOperationException' em System.Private.CoreLib.dll: 'Nullable object must have a value.'
em System.ThrowHelper.ThrowInvalidOperationException_InvalidOperation_NoValue()
em Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.AsyncEnumerator.<MoveNextAsync>d__14.MoveNext()
em System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
em System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
em Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.<ToListAsync>d__65`1.MoveNext()
em System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
em Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.<ToListAsync>d__65`1.MoveNext()
em System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
em System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
em System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
em System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
em siges_api.Repository.UsuarioRepository.<GetUsuarioAsync>d__3.MoveNext() em C:\Desenv\C#\PMS\siges-api\Repository\UsuarioRepository.cs:linha 135

Any help is welcome