public void Print_Temporary()
{
var sb = new StringBuilder();
sb.Append($"Fundamental, Time: {DateTime}{Environment.NewLine}");
sb.Append($"InstrumentId: {InstrumentId}{Environment.NewLine}");
sb.Append($"ProviderId: {ProviderId}{Environment.NewLine}");
foreach (var k in mapping.Keys)
{
if (this[k] != null)
{
sb.Append($"{k}={this[k]}{Environment.NewLine}");
}
}
Console.Write(sb.ToString());
}