将日期和时间加入到 VB.NET 中的 DateTime

Question

I am retrieving data from DB where there is a separate date and time fields. I want to join them into a DateTime field in my VB.NET project. How would you suggest accomplishing this?

I tried this but it's not working for me. "String was not recognized as a valid DateTime."

Dim InDate As New DateTime(incident.IncidentDate.Value.Year, incident.IncidentDate.Value.Month, incident.IncidentDate.Value.Day, 0, 0, 0)
                    Dim InTime As New DateTime(1900, 1, 1, incident.IncidentTime.Value.Hour, incident.IncidentTime.Value.Minute, incident.IncidentTime.Value.Second)


                    Dim combinedDateTime As DateTime = DateTime.Parse((InDate.ToString("dd/MM/yyyy") + " " + InTime.ToString("hh:mm tt")))

                    rdtpIncidentDateTime.SelectedDate = combinedDateTime

Answer 1

You can just create a new DateTime value from the components in InDate and InTime :

Dim combinedDateTime As DateTime = New DateTime( _
  InDate.Year, InDate.Month, InDate.Day, _
  InTime.Hour, InTime.Minute, InTime.Second _
)

Answer 2

DateTime exposes a method called DateTime.TimeOfDay

You can simply use DateTime.Add to append the time to the date.

Dim dateAndTime As DateTime = myDate.Add(myTime.TimeOfDay)

Answer 3

Dim CombinedDate As Date = Date1.Date + Time1.TimeOfDay

This will work when you want to combine the DATE from one variable and the TIME from a different variable.

Date is an alias to DateTime. In VB.NET, they are the same thing. You can see all the aliases in this chart on MSDN. Link

Answer 4

您可以在一行中完成...声明您的日期并使用时间的事件值而不是零。