Всем привет!

Проблема с Null-state analysis. Наследуем класс от System.Data.Common.DbCommand ==> имеем неустранимый warning на override CommandText.

Если сделать так, то имеем warning CS8765: Nullability of type of parameter 'value' doesn't match overridden member (possibly because of nullability attributes) — подчеркивает зеленым set:

public override string CommandText { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }

Если сделать так, то имеем warning CS8764: Nullability of return type doesn't match overridden member (possibly because of nullability attributes) — подчеркивает зеленым get:

public override string? CommandText { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }

Что вообще происходит и как его удовлетворить, устранить этот warning без suppression?



PS. Вот полный текст, может кому пригодится попробовать:

class MyDbCommand : System.Data.Common.DbCommand
{
    public override string? CommandText { get => throw new NotImplementedException(); set => throw new NotImplementedException(); } // <== неустранимый warning
    public override int CommandTimeout { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
    public override System.Data.CommandType CommandType { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
    public override bool DesignTimeVisible { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
    public override System.Data.UpdateRowSource UpdatedRowSource { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
    protected override System.Data.Common.DbConnection? DbConnection { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }

    protected override System.Data.Common.DbParameterCollection DbParameterCollection => throw new NotImplementedException();

    protected override System.Data.Common.DbTransaction? DbTransaction { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }

    public override void Cancel()
    {
        throw new NotImplementedException();
    }

    public override int ExecuteNonQuery()
    {
        throw new NotImplementedException();
    }

    public override object? ExecuteScalar()
    {
        throw new NotImplementedException();
    }

    public override void Prepare()
    {
        throw new NotImplementedException();
    }

    protected override System.Data.Common.DbParameter CreateDbParameter()
    {
        throw new NotImplementedException();
    }

    protected override System.Data.Common.DbDataReader ExecuteDbDataReader(System.Data.CommandBehavior behavior)
    {
        throw new NotImplementedException();
    }
}