问题
I am writing an Excel app that will read and write specified values from an Excel file, and display them to the user. However, when I try to read from a cell which has a Number Format
or a function typed 'hh:min' (Hour:Min)
I cannot obtain that value how exactly I want.
Here is my code...
ws[dateTimePicker1.Value.Day + 1].get_Range("F" + i.ToString(), Type.Missing);
if (range.Value2 != null)
val += " - " + range.Value2.ToString(); //Sets FXX to val
lbHK1.Items.Add(val);
Where...
ws
= my worksheetdateTimePicker1
= my date time picker which helps me decide which file will be openedi
= is an integer that helps me decide Row number of that cellrange
= is an object created from Microsoft.Office.Interop.Excel.Range
In my example, when i = 11
, F11
is the cell that contains the time value which is 06:30
(in Excel, fx : 06:30:00
). However, when I try to get that value, it returns a double
type such as 0.263888888888889
How can I get the value formatted correctly as it is displayed in Excel, rather than a meaningless double value?
回答1:
Excel stores times internally as doubles containing decimal fractions of a 24-hour day: so 6:30 AM would be 0.2708333
回答2:
When dealing with Excel dates, the date can either be stored as a string representation of a date, or it may be an OA date (OLE Automation Date). I've found that checking for both types is the safest route when parsing Excel dates.
Here's an extension method I wrote for the conversion:
/// <summary>
/// Sometimes the date from Excel is a string, other times it is an OA Date:
/// Excel stores date values as a Double representing the number of days from January 1, 1900.
/// Need to use the FromOADate method which takes a Double and converts to a Date.
/// OA = OLE Automation compatible.
/// </summary>
/// <param name="date">a string to parse into a date</param>
/// <returns>a DateTime value; if the string could not be parsed, returns DateTime.MinValue</returns>
public static DateTime ParseExcelDate( this string date )
{
DateTime dt;
if( DateTime.TryParse( date, out dt ) )
{
return dt;
}
double oaDate;
if( double.TryParse( date, out oaDate ) )
{
return DateTime.FromOADate( oaDate );
}
return DateTime.MinValue;
}
In your example, the usage would be:
TimeSpan time = f11Value.ParseExcelDate().TimeOfDay;
回答3:
Excel stores time in fractions of a day, 12:00 will be stored as 0.5 since 12/24 = 1/2 = 0.5
To get the hours you have to multiply the excel time by 24 and then round the result to an integer.
To get the minutes (since a day has 1440 minutes) you have to multiply the value by 1440, this will give you the minutes passed since 00:00, you'll need to divide by 60 and work over the remainder of the operation to get the time in minutes.
Here's a snippet:
string parseExcelHour(string cellInput){
double excelHour = 0;
try{
excelHour = Double.Parse(cellInput);
}catch { }
int hour = (int) (excelHour * 24);// with the int cast you get only an integer.
int min = (int) (excelHour * 1440 % 60); //mod (%) takes only the remainder and then the cast to int will round the number
return (hour < 10? "0":"") + hour + ":" + (min < 10? "0":"") + min; //will print HH:mm
}
来源:https://stackoverflow.com/questions/5290043/capturing-time-values-from-an-excel-cell