问题描述

我有一个 DataColulmn TimeSpan 类型的 DataTable.它在 SQL Server 查询中填充了一个时间列，并在屏幕上显示为 24 小时格式.我想使用表达式列将其显示为 12 小时格式 + 上午/下午，但无法做到.我尝试使用 convert to the column 来处理字符串，但它显示了一种奇怪的格式，例如 PT20H15(即 20:15 或 8:15 pm).如果小时为一位或两位数，则时间和小时的位置会发生变化，如果小时为 00，则将其删除，字符串处理似乎太复杂了.我尝试仅比较HourCol > 12"之类的列值，但这会引发关于将时间跨度与 int 进行比较的错误，因此我再次失败.有没有人有不同的建议?

I have a DataTable with a DataColulmn of TimeSpan type. It gets filled with a time column in a SQL Server query, and it shows as a 24 hr format on screen. I wanted to show it as a 12 hr format + am/pm using an expression column, but coulnd't do it. I tried using convert to the column to handle the string, but it shows a strange format such as PT20H15 (that would be 20:15 or 8:15 pm). As the position of time and hour changes if the hour is one or two digits, and if hour is 00 then it get removed, string handling seems like too complicated. I tried just comparing the column value like "HourCol > 12" but that raises an error regarding comparing timespan to int, so I failed again. Does anyone have a different suggestion?

提前致谢.

推荐答案

它显示了一个奇怪的格式，例如 PT20H15

it shows a strange format such as PT20H15

这根本不是一种奇怪的格式.它是一段时间的 ISO-8601 格式，对于 TimeSpan 来说是相当合理的.

That's not a strange format at all. It's an ISO-8601 format for a period, which is fairly reasonable for a TimeSpan.

我想将其显示为 12 小时格式 + 上午/下午

I wanted to show it as a 12 hr format + am/pm

听起来您正在使用 TimeSpan 来表示一天中的时间"，说实话这远非理想.我知道这是 DateTime.TimeOfDay 给出的，但这只是因为框架没有仅时间"类型，运气不好.

That sounds like you're using a TimeSpan for a "time of day", which is far from ideal to be honest. I know it's what DateTime.TimeOfDay gives, but that's just because the framework doesn't have a "time only" type, worse luck.

有人有不同的建议吗?

你能否有一个计算列，它基本上是一些固定日期(甚至是 DateTime.Today)+ 时间跨度值，并使用 hh:mm tt 格式化格式?(您是否可以自己手动覆盖 DataTable 中的值，而不是使用计算表达式?)

Can you have a computed column which is basically some fixed date (or even DateTime.Today) + the timespan value, and format that using a hh:mm tt format? (Could you manually overwrite the values yourself in the DataTable, perhaps, rather than using a computed expression?)

另一种选择是更改您的 SQL 查询以转换为日期/时间值，而不是在 DataTable 中进行.

Another alternative would be to change your SQL query to do the conversion to a date/time value, rather than doing it in the DataTable.

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