C#•3y ago

Pass DateTime.Add function as parameter

I have a switch statement that will call a generation function so I don't have to loop for every scenario:

switch (E.RepMode)
{
    case "daily":
        repeats.Add(GenerateRepeats(entry.DateStart, entry.DateEnd, 1, DateTime.AddDays));
        break;
    case "weekly":
        break;
    case "monthly":
        break;
    case "yearly":
        break;
}

switch (E.RepMode)
{
    case "daily":
        repeats.Add(GenerateRepeats(entry.DateStart, entry.DateEnd, 1, DateTime.AddDays));
        break;
    case "weekly":
        break;
    case "monthly":
        break;
    case "yearly":
        break;
}

The function needs to be something like this:

public List<EntryRepeat> GenerateRepeats(DateTime start, DateTime end, int interval, Func<double, DateTime> f)
{
    do
    {

    }
    while (true);
}

public List<EntryRepeat> GenerateRepeats(DateTime start, DateTime end, int interval, Func<double, DateTime> f)
{
    do
    {

    }
    while (true);
}

However I'm not able to pass the function being non-static. Is there a way to achieve this or a better approach?

5 Replies

Aaron•3y ago

just have (dt, added) => dt.AddDays(added), and then have Func<DateTime, double, DateTime> actually there isnt a function called AddDays spinthink

Pobiega•3y ago

https://learn.microsoft.com/en-us/dotnet/api/system.datetime.adddays?view=net-7.0 ?

DateTime.AddDays(Double) Method (System)

Returns a new DateTime that adds the specified number of days to the value of this instance.

Aaron•3y ago

not sure what i was looking at earlier

Pobiega•3y ago

But yeah, to answer @Alex Frost 's question, since you need a DateTime reference to "add days" to, just do what Aaron suggested and add it to the func

Alex FrostOP•3y ago

Thank you guys, I'll try that. My understanding of C# basic concepts is lacking but will revise.

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Pass DateTime.Add function as parameter