c# compare DateTime start and DateTime stop with List<DateTime>

Like the title says:

I have a DateTime start and a DateTime stop开发者_C百科

Now i want to compare these with a List<DateTime> dates

I just wanto check if the list dates is between start and stop

if(dates.all(..... >= start && <= stop)) { . do something }

The pseudo-code in your question is not far from the working code you're looking for.

Using LINQ's All() method:

if (dates.All(date => date >= start && date <= stop)) {
    // Do something.
}

Sort the list. Check if the first item in the list is >= start date and last item in the list <= end date

With linq: if(dates.All(d => d >= start && d <= stop))

Use the All extension method, and a lambda expression that does the comparison:

if (dates.All(d => d >= start && d <= stop)) { ... }

Incase you want to iterate just the dates in the bracket, you can use the following:

foreach (DateTime date in dates.Where(o => o >= start && o <= stop))
{
    //Do your thing.
}

You can work on it like

bool allTrue = LstDates.TrueForAll(delegate(DateTime dt) { return dt >= startDate && dt <= endDate; });