Question

var resultsFromSql = from wb in reportContext.WorkItems
                             where wi.DateRequired >= model.FirstDate && wi.DateRequired <= model.SecondDate
                             select new
                             {
                                 wi.Reference,
                                 dateRequired = SqlFunctions.DatePart("yyyy", wi.DateRequired) + "/" + SqlFunctions.DatePart("mm", wi.DateRequired) + "/" + SqlFunctions.DatePart("dd", wi.DateRequired),
                                 earliestActionDate = SqlFunctions.DatePart("yyyy", wi.EarliestActionDate) + "/" + SqlFunctions.DatePart("mm", wi.EarliestActionDate) + "/" + SqlFunctions.DatePart("dd", wi.EarliestActionDate),
                                 mainRef = wi.MainReferenceId != 0 ? wi.MainReferenceId.ToString() : " ",
                                 subRef = wi.SecondaryReference ?? "",
                                 details = wi.DisplayDetails ?? "",
                                 createdOn = SqlFunctions.DatePart("yyyy", wi.CreatedOn) + "/" + SqlFunctions.DatePart("mm", wi.CreatedOn) + "/" + SqlFunctions.DatePart("dd", wi.CreatedOn),*/ /*wi.UpdatedBy,
                                 updatedOn = SqlFunctions.DatePart("yyyy", wi.UpdatedOn) + "/" + SqlFunctions.DatePart("mm", wi.UpdatedOn) + "/" + SqlFunctions.DatePart("dd", wi.UpdatedOn),
                                 timeTaken = SqlFunctions.DateDiff("day", wi.UpdatedOn, wi.CreatedOn) + " days " 
                                        /*+ SqlFunctions.DatePart("h", wi.UpdatedOn - wi.CreatedOn) + ":"
                                        + SqlFunctions.DatePart("n", wi.UpdatedOn - wi.CreatedOn) + ":"
                                        + SqlFunctions.DatePart("s", wi.UpdatedOn - wi.CreatedOn)*/,
                                 timeStuff = SqlFunctions.DatePart("h", wi.UpdatedOn /*- wi.CreatedOn*/)
                             };

TimeTaken和TimeStuff由于DatePart不支持小时等而无法工作，我得到与timeTaken的注释部分的dateTime数学相关的其他错误。如何创建x天，小时，分钟和秒的timeTaken值，这是从updatedOn减去createdOn计算的时间长度，它们是dateTimes。

/*List<T> list = new List<T>();*/
            foreach (var res in resultsFromSql.ToList())
            {
                res.timeTaken = res.CreatedOn; /*= SqlFunctions.DateDiff("day", res.UpdatedOn, res.CreatedOn)#1#
            }

如果我之后运行foreach，我无法为任何属性赋值，因为匿名类型是readonly。如何以剩余时间（最多24小时），分钟数（最多60分）和秒数（最多60分钟）来获取我的日子（全天价值，而不是剩余部分，即197天）。

Answer 1

仔细看看你在做什么，试试看：

var resultsFromSql = from wb in reportContext.WorkItems
                         where wi.DateRequired >= model.FirstDate && wi.DateRequired <= model.SecondDate
                         select new
                         {
                             wi.Reference,
                             dateRequired = wi.DateRequired.ToString("yyyy/mm/dd"),
                             earliestActionDate = wi.EarliestActionDate.ToString("yyyy/mm/dd"),
                             mainRef = wi.MainReferenceId != 0 ? wi.MainReferenceId.ToString() : " ",
                             subRef = wi.SecondaryReference ?? "",
                             details = wi.DisplayDetails ?? "",
                             createdOn = wi.CreatedOn.ToString("yyyy/mm/dd"),
                             updatedOn = wi.UpdatedOn.ToString("yyyy/mm/dd"),
                             timeTaken = new TimeSpan(wi.UpdatedOn.Ticks - wi.CreatedOn.Ticks).Days.ToString() + " days " +
                                            new TimeSpan(wi.UpdatedOn.Ticks - wi.CreatedOn.Ticks).Hours.ToString() + ":" +
                                            new TimeSpan(wi.UpdatedOn.Ticks - wi.CreatedOn.Ticks).Minutes.ToString() + ":" +
                                            new TimeSpan(wi.UpdatedOn.Ticks - wi.CreatedOn.Ticks).Seconds.ToString()
                         };

只需在编辑器中输入，您可能需要稍微调整一下。这假定wi.DateRequired，wi.EarliestActionDate，wi.CreatedOn和wi.UpdatedOn是DateTime Type。还假设timeStuff是实验性的（尝试使其工作）并将其删除。

Answer 2

public string ConvertToDayHourMinSec(DateTime firstTime, DateTime secondTime)
    {
        var timeTaken = new TimeSpan(firstTime.Ticks - secondTime.Ticks);
        var days = timeTaken.ToString("%d"); 
        var hms = timeTaken.ToString(@"hh\:mm\:ss");
        return days + " days, " + hms;
    }

感谢@ Kevin的回答让我走上了正确的道路。对于内联使用，代码有点重，所以我创建了上面的函数，可以使用任何dateTime调用，即

UpdatedMinusCreated = ConvertToDayHourMinSec(res.UpdatedOn, res.CreatedOn),

并提供格式4 days, 03:07:42

Linq以天，小时，分钟和秒为单位生成自定义时段

2 个答案: