public string?ToJson()
{
if (Ret == null)
{
return(null);
}
if (IsPainText)
{
return(Ret.ToString());
}
if (StatusCode == 200)
{
return(Ret.ToDtoJson());
}
return(JsonSerializer.Serialize(Ret, new JsonSerializerOptions
{
WriteIndented = true,
IgnoreNullValues = true
}));
}