c# code to find exact date difference as in vb [du

问题:

This question already has answers here:

Calculate difference between two dates (number of days)? (15 answers)

Closed 5 years ago.

In VB there is a function called DateDiff(). But in C# it is not available. I want a function or any code in C# that can perform the same DateDiff function as in VB..

Dim datTim1 As Date = #1/4/2001#
Dim datTim2 As Date = #1/9/2001#
Dim wD As Long = DateDiff(DateInterval.Weekday, datTim1, datTim2)
Dim wY As Long = DateDiff(DateInterval.WeekOfYear, datTim1, datTim2)

I want to do this in C#...

回答1:

1. Add to your C# project a reference to the .Net assembly Microsoft.VisualBasic
2. Call Microsoft.VisualBasic.DateAndTime.DateDiff() with the appropriate parameters.

回答2:

You can create your own DateDiff() function:

public enum Intervals
{
    Days,
    Months,
    Years
}

public static int DateDiff(Intervals eInterval, System.DateTime dtInit, System.DateTime dtEnd)
{
    if (dtEnd < dtInit)
        throw new ArithmeticException("Init date should be previous to End date.");

    switch (eInterval) {
        case Intervals.Days:
            return (dtEnd.AddDays - dtInit).TotalDays;
        case Intervals.Months:
            return ((dtEnd.Year - dtInit.Year) * 12) + dtEnd.Month - dtInit.Month;
        case Intervals.Years:
            return dtEnd.Year - dtInit.Year;
        default:
            throw new ArgumentException("Incorrect interval code.");
    }
}