public async Task <IEnumerable <VegaMoveDeviceData> > GetCurrentAsync(CancellationToken cancellationToken = default)
{
var dataIds = (from data in _context.MoveDeviceDatas
group data by data.DeviceId into gData
select new { gData.Key, date = gData.Max(x => x.Uptime) })
.AsNoTracking();
Expression <Func <VegaMoveDeviceData, bool> > predict = x => false;
foreach (var item in dataIds)
{
Expression <Func <VegaMoveDeviceData, bool> > lambdaNew =
x => x.Uptime == item.date && x.DeviceId == item.Key;
var lambdaBody = ExpressionReplacer
.ReplaceParameter(lambdaNew.Body, lambdaNew.Parameters[0], predict.Parameters[0]);
var body = Expression.OrElse(predict.Body, lambdaBody);
predict = Expression.Lambda <Func <VegaMoveDeviceData, bool> >(body, predict.Parameters);
}
return(await _context.MoveDeviceDatas
.Where(predict)
.AsNoTracking()
.ToListAsync(cancellationToken)
.ConfigureAwait(false));
}
