项目中的计时器控制 [英] timer control in project

问题描述

objTimeSpent = DateTime.Now.Subtract(ViewState("StartTime"))

推荐答案

如果没有继续显示错误消息，我只能建议您在转换之前将ViewState("StartTime")转换为DateTime您可以使用它.

Without the explicit error messge to go on, I can only suggest that you need to cast ViewState("StartTime") to a DateTime before you use it.

我从您的问题中了解到，您在视图状态下有一些日期时间值，并且想要从当前时间中减去它.

What I understood from your question is, you have some date time value in view state and you want to subtract it from current time.

var timespan = DateTime.Now.Subtract((DateTime)ViewState["DateTime"])

您必须检查ViewState是否为空或有效的日期时间值.否则，您将获得例外.
要了解有关DateTime的更多信息，请在此处检查 [

You must need to check the ViewState for null or valid date time value. Else you will get exception.
To know more about the DateTime check here[^]

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