DateTime   dt   =   DateTime.ParseExact("20060709110901","yyyyMMddHHmmss", System.Globalization.CultureInfo.CurrentCulture);

或者这样

var ReadyBeginTime = request.PrehotDate.Trim().ConvertToNullableDateTime("yyyyMMddHHmmss");

if (ReadyBeginTime.HasValue)

{

creating.ReadyBeginTime = ReadyBeginTime.Value;

}

else

{

return result.IsFailure("预热开始时间不能为空！");

}